[sage-devel] Re: Inserting Images into Notebook - upload dialog
On Apr 12, 8:43 am, Tim Joseph Dumol t...@timdumol.com wrote:
import shutil
shutil.copy(DATA + 'myfilename.ext', '.')
That could be done similarly without using DATA - as
from shutil import copy
copy('/home/excetera.png', '.')
Alec
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[sage-devel] Re: Inserting Images into Notebook - upload dialog
On Apr 12, 4:49 pm, William Stein wst...@gmail.com wrote:
On Monday, April 12, 2010, Alec Mihailovs wrote:
from shutil import copy
copy('/home/excetera.png', '.')
Using DATA explicitly and shutil is not necessary. Just upload the
file foo.png as you say, then use it in the tag directly and it
should just work.
Yes, if a file is uploaded, then it could be used as html('img
src=excetera.png/')
What I wrote (with shutil, but without DATA), works directly, without
uploading, and without using html. An interesting thing is that after
that is done, and the image is copied to one of cells (but without
uploading), it still can be used in an html tag from another cell just
referring to its name - same as if it was uploaded.
Alec
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[sage-devel] Re: If using a computer to do your math homework is like copying
On Apr 4, 11:22 am, rjf fate...@gmail.com wrote: (followup could be done at the MIT page, here, or Sage-flame, or is there a list for educational applications of Sage??) I forwarded that to http://groups.google.com/group/sage-edu (but that should be approved by moderators there :) Alec Mihailovs -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org To unsubscribe, reply using remove me as the subject.
[sage-devel] Re: Sage on AIX
On Apr 3, 5:28 am, Dima Pasechnik dimp...@gmail.com wrote: one can apparently get remote access to an AIX system via IBM's Academic Initiative programhttp://www.ibm.com/developerworks/university/software/get_software.html Not exactly related to this thread (but related to this link), Microsoft also offers free (as in beer) Visual Studio 2008, Windows Server 2008 Enterprise, Expression Studio 3 and more for faculty, http://www.microsoft.com/education/facultyconnection/software/softwarelist.aspx?c1=en-usc2=0 That might be helpful for people interested in developing native Sage port on Windows. Alec Mihailovs -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org To unsubscribe, reply using remove me as the subject.
[sage-devel] Re: Annual Spies Prize Winner Announced!
Minh, In a few days that I was here, you were one of the most helpful guys, together with William Stein, David Joyner and Mike Hansen, as well as Jaap Spies himself. I guess that Jaap, William, and David can't have this award, and Mike had it last year. That seems to be a rather simple choice for the committee. Congratulations!!! Alec Mihailovs -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org To unsubscribe from this group, send email to sage-devel+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject.
[sage-devel] Re: method int_repr only works for small finite fields
On Mar 20, 10:11 pm, Minh Nguyen nguyenmi...@gmail.com wrote: On Sun, Mar 21, 2010 at 10:19 AM, Alasdair McAndrew amc...@gmail.com wrote: def intr(z): C=z.polynomial().coeffs() fc=parent(z).characteristic() tmp=0 for i in range(len(C),0,-1): tmp=fc*tmp+int(C[i-1]) return tmp That can be also written short, but working slightly slower as sage: def intr1(z): : return ZZ(z.polynomial().coeffs(),parent(z).characteristic()) And using functional programming, which works slightly faster than intr, as sage: def int4(z): : C=reversed(map(int,z.polynomial().coeffs())) : fc=parent(z).characteristic() : return reduce(lambda x,y:fc*x+y,C) Alec Mihailovs -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org To unsubscribe from this group, send email to sage-devel+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject.
[sage-devel] Re: method int_repr only works for small finite fields
On Mar 21, 10:03 am, Martin Albrecht m...@informatik.uni-bremen.de wrote: In all cases it should return a Sage Integer not a Python int. All of the functions intr, intr1, and int4 return a Sage integer, not a Python int. Also, for small fields, log_to_int operates the same way, sage: F.X=GF(2^6) sage: r=F.random_element(); r X^5 + X^2 + X + 1 sage: int4(r) 39 sage: r.log_to_int() 39 However, for large fields, say GF(7^100), log_to_int is not implemented. Perhaps, either that name can be used instead of integer_representation, or something similar, say poly_to_int. Also, if there is a conversion from polynomials to integers, it would have sense to have a backward conversion from integers to polynomials. It can be done similarly as def poly_repr(n,f): C=reversed(n.digits(f.characteristic())) return reduce(lambda x,y:f.gen()*x+y,C) For example, sage: poly_repr(int4(r),F) X^5 + X^2 + X + 1 sage: _==r True The name for it can be chosen correspondingly to the name of the first conversion, say int_to_poly. The corresponding functions in the Maple's implementation of GF are called input and output. They work in Maple as F:=GF(7,100): F:-input(101); 2 3 + 2 T F:-output(%); 101 Alec Mihailovs -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org To unsubscribe from this group, send email to sage-devel+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject.
[sage-devel] Re: method int_repr only works for small finite fields
On Mar 21, 5:01 pm, Martin Albrecht m...@informatik.uni-bremen.de wrote: sage: K.fetch_int(10) a^2 + 1 It's also working only for small fields. Meanwhile, I found out that int4 returns python int in some cases. In particular, sage: type(int4(F.one())) type 'int' Also, neither int4, nor poly_repr work with 0, sage: int4(F.zero()) TypeError: reduce() of empty sequence with no initial value sage: poly_repr(0,F) TypeError: reduce() of empty sequence with no initial value So both of them should be corrected by dealing with 0 separately and converting python int to Sage integers in int4. Alec Mihailovs -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org To unsubscribe from this group, send email to sage-devel+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject.
[sage-devel] Re: method int_repr only works for small finite fields
On Mar 21, 5:34 pm, Alec Mihailovs alec.mihail...@gmail.com wrote: So both of them should be corrected by dealing with 0 separately and converting python int to Sage integers in int4. Here are the corrected versions of int4 and poly_repr, sage: def int4(z): : C=reversed(map(int,z.polynomial().coeffs())) : fc=parent(z).characteristic() : return reduce(lambda x,y:fc*x+y,C,0) def poly_repr(n,f): C=reversed(n.digits(f.characteristic())) return reduce(lambda x,y:f.gen()*x+y,C,f.zero()) sage: type(int4(F.one())) type 'sage.rings.integer.Integer' sage: poly_repr(0,F) 0 sage: type(_) class 'sage.rings.finite_field_element.FiniteField_ext_pariElement' sage: int4(F.zero()) 0 sage: type(_) type 'sage.rings.integer.Integer' Alec Mihailovs -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org To unsubscribe from this group, send email to sage-devel+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject.
[sage-devel] Re: method int_repr only works for small finite fields
By the way, I looked at the help page for digits,
sage: base=7
sage: x=12345654321234565432123456543212345654321234565432123456
sage: x.digits?
and it is said there (at the end) that
Using ``sum()`` and ``enumerate()`` to do the same thing is
slightly faster in many cases (and ``balanced_sum()`` may be
faster
yet). Of course it gives the same result:
sage: base = 4
sage: sum(digit * base^i for i, digit in
enumerate(x.digits(base))) == ZZ(x.digits(base), base)
True
However, timing shows that ZZ is faster than sum with enumerate, and
reduce is faster than both of them,
sage: L=x.digits(base)
sage: timeit('sum(digit * base^i for i, digit in enumerate(L))')
625 loops, best of 3: 59.2 ��s per loop
sage: timeit('ZZ(L,base)')
625 loops, best of 3: 57.3 ��s per loop
sage: timeit('reduce(lambda x,y:base*x+y,reversed(L),0)')
625 loops, best of 3: 29.2 ��s per loop
Alec Mihailovs
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[sage-devel] Re: Bug advertisement
On Mar 21, 11:38 am, Ronan Paixão ronanpai...@yahoo.com.br wrote: Also, since I'm using that ugly OS, For me, Windows 7 is beautiful! Unfortunately, I have to use that ugly Linux most of the time when I want to use Sage. Also, the terminal which is opened when sage is autostarted, doesn't say that the showed IP can be used in a browser outside the VirtualBox environment, Another problem with it is that I closed that window once, and it didn't appear when I started VirtualBox next time (and after that). Alec -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org To unsubscribe from this group, send email to sage-devel+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject.
[sage-devel] Re: Sage 4.3.4.rc0 released
On Mar 20, 9:17 pm, William Stein wst...@gmail.com wrote: Hi -- I worked on this today, but it simply took too long for Sage to build. I will continue working on this next Monday (just over a week from now), when I get back to Canada, and then finally have a 4.3.4 Virtualbox, unless of course some other Sage developers wants to post an updated VirtualBox image. I would build it myself if there were sources and building instructions available. Are they? Alec Mihailovs -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org To unsubscribe from this group, send email to sage-devel+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject.
[sage-devel] Re: Bug advertisement
Jaap, But wait! A native Windows Sage is almost there. That would be excellent! I'm not sure that cygwin would work on my 64- bit system (never tried it though.) Alec -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org To unsubscribe from this group, send email to sage-devel+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject.
[sage-devel] Re: Bug advertisement
Jaap, On my ugly 64 bit system I can run 32 bit software without a problem :) Me too. But cygwin is a different story. A couple of years (or more?) ago, when I switched from 32-bit Windows to 64-bit (XP at that time), cygwin didn't work on 64-bit Windows. I used cygwin extensively for many years before that, and was quite sorry then that I won't be able to play gnibbles and other such things. Is it working in 64-bit Windows 7 now? I would be happy to install it again. Alec -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org To unsubscribe from this group, send email to sage-devel+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject.
[sage-devel] Re: Bug advertisement
On Mar 21, 9:28 pm, Alec Mihailovs alec.mihail...@gmail.com wrote: Is it working in 64-bit Windows 7 now? I would be happy to install it again. Wow! Just installed the basic cygwin and it is working! I'll try to build Sage there. Alec -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org To unsubscribe from this group, send email to sage-devel+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject.
[sage-devel] Re: Category for IntegerModRing(n)
From the user point of view, without reading the documentation, I would expect IntegerModRing(n) be a ring, IntegerModField(p) be a field, and Integer ModAbelianGroup(n) be an Abelian group. So I would go with option (2). It would be rather confusing to define something that you think is a ring, and then find out that it is a field. The situation would be different for IntegerMod(n), in which case the category can be specified using a keyword category, which could be CommutativeRings by default, but may be changed as category=Fields, as in option 3, or category=AbelianGroups, if desirable. Alec Mihailovs -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org To unsubscribe from this group, send email to sage-devel+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject.
[sage-devel] Re: Sage 4.3.4.rc0 released
It's not related to this particular release - just in general. I tried to upgrade Sage in VirtualBox on Windows (from version 4.3 that I installed 2 days ago, which is the latest version distributed for Windows), and everything seemed fine for a while, but then I got the error message that I run out of space. At this time the used volume was only 1.6 GB, with 16GB available in the virtual machine. After that, my original installation got broken - and after rebooting and restarting, the Windows' Firefox can't even connect to the Sage server. Does that mean that Windows distribution as a VirtualBox appliance can not be upgraded? Alec Mihailovs -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
[sage-devel] Re: Parents with a natural action on a space
On Mar 17, 6:46 pm, Nicolas M. Thiery nicolas.thi...@u-psud.fr
wrote:
Dear Dima, dear Sage devs,
Dan Bump recently raised the issue that the `lattice` method for Weyl
groups is badly named. I agree, but the issue is more general. Hence,
here is a call for good names.
Let P be a parent endowed with a natural action (or representation) on
a space `E`. For example:
- P is a group of permutations of E = {2,4,9,7}
- P is an algebra of matrices, acting on a vector space E
- P is a monoid of functions from E = {a,b,c} to itself
- P = End(E)
What should be the name of the method of P returning E ?
- P.domain() ?
- P.natural_representation() ?
- P.natural_representation_space() ?
- P.natural_module() ?
- P.action_set() ?
- something else?
Maybe, P.over ? It could be a property, perhaps, rather than a method.
Alec Mihailovs
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[sage-devel] Re: Sage 4.3.4.rc0 released
On Mar 17, 8:02 pm, William Stein wst...@gmail.com wrote: I didn't realize that the VirtualBox distro hadn't been upgraded in so long. I'll try hard to upgrade it to 4.3.4 and post a new version before I leave for Canada on Sunday morning. (Upgrading it is not easy, as you found...) Thank you very much, Alec -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
[sage-devel] Re: Sage 4.3.4.rc0 released
Upgrading to that release on my 64-bit Ubuntu 9.10 (from Sage 4.1. something) everything went fine except fortran. Here are the related error messages sage-spkg fortran-20100118 21 Warning: Attempted to overwrite SAGE_ROOT environment variable fortran-20100118 ... Extracting package /home/alec/sage-3.0.1/spkg/standard/ fortran-20100118.spkg ... ... Finished extraction Host system uname -a: Linux alec-desktop 2.6.31-20-generic #58-Ubuntu SMP Fri Mar 12 04:38:19 UTC 2010 x86_64 GNU/Linux CC Version gcc -v Using built-in specs. Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.4.1-4ubuntu9' --with-bugurl=file:///usr/share/doc/gcc-4.4/ README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/ usr --enable-shared --enable-multiarch --enable-linker-build-id --with- system-zlib --libexecdir=/usr/lib --without-included-gettext --enable- threads=posix --with-gxx-include-dir=/usr/include/c++/4.4 --program- suffix=-4.4 --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --disable-werror --with-arch-32=i486 --with- tune=generic --enable-checking=release --build=x86_64-linux-gnu -- host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 4.4.1 (Ubuntu 4.4.1-4ubuntu9) ** Error installing Fortran: You must install gfortran or set SAGE_FORTRAN (and possibly SAGE_FORTRAN_LIB). ** Alec Mihailovs -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
[sage-devel] Re: Sage 4.3.4.rc0 released
Minh and William, Thank you very much and sorry that I didn't read about the prerequisites before upgrading. After installing gfortran (I did it system-wide, so setting SAGE_FORTRAN and SAGE_FORTRAN_LIB was not necessary), everything was going smooth. The installation,building, and tuning took some time, but finally ended with no errors reported. Not exactly related to that, but during installation I saw a lot of C code. It seems strange that Ohloh (I got that link from the development page on Sage site) https://www.ohloh.net/p/sage/analyses/latest reports that Sage has -15,017 (a negative number) C code lines. Say, -5 shell script comment lines I can understand (5 lines with negative comments), but how the number of code lines can be negative? Alec Mihailovs -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
[sage-devel] Re: Logistic Curve Fitting in Sage
On Mar 12, 4:22 am, Joal Heagney joalheag...@gmail.com wrote:
Hi guys and gals,
Currently I'm attempting to fit the following data to the general
logistic model:
[(0,0),(1,0),(2,13),(3,28),(4,48),(5,89),(6,107),(7,168),(8,188),(9,209)]
The form of the logistic curve I am using is:
K/(1 + a*exp(r * (t - t0)))^(1/v)
with K,a,r,t0 and v being parameters, t the dependent variable.
Attempting to use find_fit, I get values of:
[K == 84.99972210745, a == 126.84970317061706, r ==
-183.75725583987102, t0 == -124.8433024602822, v == 105.35677984548882]
This is obviously wrong as K is nowhere near the right-hand asymptote in
the data. Using a more bare-bones approach based on fmin, I get more
realistic results of:
[249.143779989,11.657027477,-0.535852892673,-0.0364250104883,0.52301206184]
The K is approximately the average value of the data and the resulting
function is practically a constant K.
Both Mathematica's function FindFit and Maple's function Statistics:-
Fit produce similar results with K close to 85 and different other
parameter values, buth also with the result being very close to a
constant function.
The problem seems to be in the bad initial guess.
A better initial guess produce rather nice looking answer in Sage,
Using data and model(t) from the YannLC reply,
data = [(0,0),(1,0),(2,13),(3,28),(4,48),(5,89),(6,107),(7,168),
(8,188),(9,209)]
var('K,a,r,t,t0,v')
model(t) = K/(1 + a*exp(r * (t - t0)))^(1/v)
s=find_fit(data,
model,initial_guess=[200,10,0,1,1],parameters=[K,a,r,t0,v],solution_dict=True);
s
{t0: 1.9182136806459771, K: 249.14668753230089, a: 4.0889718235600832,
r: -0.53583047134875161, v: 0.52295328451032852}
plot([scatter_plot(data), plot(model(t).subs(s),(0,9))])
Alec Mihailovs
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[sage-devel] Re: Windows
Another alternative, for using Sage in class, instead of using a (non-existing) native Windows port, or one of the virtualizations, is to use it from a live CD, booting Linux. The CDs are easy to distribute in class, and students don't have to download and install anything. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-devel] Re: Windows
From: mabshoff mabsh...@googlemail.com That is why having an MSI installer that includes Cygwin is important at that stage since dropping a working Sage into a foreign Cygwin is assured with probability 1 to be broken in some aspect. That will create problems though if Cygwin is already installed. There shouldn't be two cygwin.dlls on the same computer. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-devel] Re: Windows
From: mabshoff mabsh...@googlemail.com There shouldn't be two cygwin.dlls on the same computer. No, this does not apply since first cygwin1.dll in %PATH% or CWD will be the one used if no DLL has been loaded into RAM. You cannot run two different Cygwin instances at the same time and expect them to work. The problems usually occur when a wrong cygwin's dll is loaded. It was a recurring topic on the cygwin's mailing list for several years (I don't subscribe to it now.) That's why the best way for an application to work used to be to include it in the cygwin distribution. I don't use cygwin now, so that may be changed though. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-devel] Re: virtual box
The best experience that I had in Windows with SAGE was when SAGE was available from cygwin. The second best was in Virtual PC (free from Microsoft) with first Ubuntu installed in it, and then SAGE built from source there. Currently I use SAGE (built from source) in Ubuntu 8.04 installed in the hard drive partitioned 50-50 for Vista and Ubuntu. That is better than both of the other choices above. I would recommend it. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-devel] Re: Things I miss from Maple in Sage
sage: data = [-1, 2, 3]
sage: [(0 if d 0 else d) for d in data]
sage: data = ma_eval('data /. x_?(# 0 ) - 0')
Couldn't stop myself from showing how that would work in Maple,
data:=[-1,2,3]:
evalindets(data,negative,0);
[0, 2, 3]
Alec
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[sage-devel] Re: Things I miss from Maple in Sage
Couldn't stop myself from showing how that would work in Maple, data:=[-1,2,3]: evalindets(data,negative,0); [0, 2, 3] Or in more, maybe, readable form, applyrule(x::negative=0,data); [0, 2, 3] Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-devel] Re: Symbolic differential equation solving deserves better syntax
I guess Mathematica is the leader on solving differential equations symbolically, and pending other great ideas, I think their syntax is worth copying. Here's an example of the DSolve syntax in Mathematica: I think, Maple is better at that, especially for partial differential equations. In particular, Lie symmetries and Heun functions are explored much more in Maple than in Mathematica. It still has some bugs, but they usually come from other sources, such as extremely buggy int, solve, or simplify. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-devel] Re: Sphinx and the Sage Documentation
I, certainly, like both Sphinx and wiki. It would be great if they could be united. What I miss in the documentation, is index and search (not just one document, but all of them), as in Windows chm files. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-devel] Re: Symbolic differential equation solving deserves better syntax
Yes, Maple puts both ODE and initial conditions in one set, as
dsolve({ODE, ICs}, y(x), options)
Alec
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[sage-devel] Re: questions about the Programming guide
Guys, I started to read that recently, and it's really appalling. How long do you post on the Usenet? One of the first thing one should to learn is not to quote the previous message in full, or most of it. Quote only the part that you respond to. Please. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-devel] Re: questions about the Programming guide
- Show quoted text - I didn't mean exactly your post. It was just a note in general. What is the point in quoting if you read posts in Google? Everything is there, above. It's just clogging my mail and I really don't see any point in it. What is the point? Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-devel] Re: questions about the Programming guide
Just random pick from today's mail, follows below, and sorry for top
posting. 100+ lines of quotting (I didn't really count, it may be less than
that) and 4 lines of comment. With my spam rules (everything with more than
50% of quotting goes to junk mail) it went directly there, where it belongs.
But some other posts with 2 lines of comment could have more sense. Because
of that, I have to go through all spam only to see whether it have some
sense, or not. And I am guessing that I am not the only one doing that.
Is there really any point in quotting all the message that you respond to
with 1 or 2 sentences?
Alec
On Mon, Aug 18, 2008 at 5:10 PM, Bill Page [EMAIL PROTECTED]
wrote:
Martin,
On Sat, Aug 16, 2008 at 1:59 AM, Martin Rubey wrote:
Bill Page writes:
I am not so sure that a similar role can be played by FriCAS.
The FriCAS/Axiom libraries are not so easily called by an
external program. Instead we have the same option to interface
with FriCAS as we have with Maxima - via the pseudo-terminal
(pty) serial interface. This has the same drawbacks in both
Maxima and FriCAS.
I recently thought that it might be quite easy to have a domain
SAGEForm, similar to OutputForm or --
actually, doesn't OpenMath provide what SAGE needs?
OpenMath was an early attempt to do something much more ambitious than
what Sage needs. *If* the OpenMath option in Axiom was working today,
then it would indeed be a good way to pass output from Axiom back to
Sage while retaining as much of the Axiom type information as
possible. The necessary hooks for OpenMath generation are present in
the current panAxiom code, but OpenMath as implemented in Axiom
depends on an external library that is not currently included with any
panAxiom version.
But as I said, OpenMath attempts to solve the general problem of
exporting full semantic information from a computer algebra system.
This is more than what is required for a good interface to Sage. In
panAxiom we also have the MathML output. Currently only presentation
MathML is generated but there is an extension of MathML that include
much more content (semantic) information without getting into the
generalities of OpenMath. Perhaps a 'SAGEform' domain could be based
on an extension of the MathML output option.
But still misses one of the hardest parts - mapping Axiom type
structures back to Sage in a way that other parts of Sage understand
these structures. At a mathematical level (e.g. various kinds of
polynomials) this is probably not too hard, but at a more fundamental
level things get more difficult. For example, Sage (actually
originating with Python) has not data structure directly corresponding
to 'Record' or 'Union' in Axiom. This can cause a lot of trouble when
trying to access the results of those computations in Axiom that
return complex results. You will no doubt be aware that this occurs
when accessing the output of GUESS from within Sage.
The dumb mode of calling an external program like Axiom just passes
a string, e.g.
sage: axiom('x^2+1')
then the parsing of 'x^2+1' occurs entirely within Axiom. But it is
not so interesting to always be creating and passing strings.
There is very a little documentation available in Sage about how the
conversion from Sage internal format to some external format (such as
used when calling Axiom). This happens automatically when you write
something like
sage: axiom(x^2+1)
without including the 'quotes'. In this case Sage parses the expression
x^2+1
and creates a native polynomial object. Then the 'axiom' function must
now recursively process this Sage expression until it finds objects
and operations near the bottom of the tree that it knows how to
interpret as Axiom objects and operations. Most of the coding that
accomplishes this is outside of the 'axiom.py' interface itself,
distributed over several other Python classes. As far as I know
William Stein is still the best source for how this conversion works.
He has said that really it is very simple and I guess I do
understand parts of it, but you should expect to spend some time to
re-discover how it works sufficiently well in order to improve it.
In order to pass Axiom expressions back to Sage, it seems to me that
we might have to implement something like this only working in
reverse.
Anyway, I think there is a lot of potential for improvement in the
existing 'axiom.py' interface even without considering how to solve
the problem of an efficient application program interface. One thing
that I miss a lot when using Axiom from the Sage notebook is the
ability to embed Spad code and compile it. This should be quite
straightforward to add to 'axiom.py'.
I would be glad to work with anyone else interested in improving the
Axiom/FriCAS interface for Sage.
In the long term there should be a way to call lisp from C or Python
directly. Then all the problems above could be solved
much more easily. If
[sage-devel] Re: sagemath.org relaunch
I've noticed 2 things. First - mirrors were not showing in the download page (when I looked at it - it may be fixed by now). Second - there seem to be no a link to the screenshot page. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-devel] MoinMoin with jsMath
I've just added a simple formatter and a simple macro to mapleadvisor wiki and now the formulas can be typed in LaTeX there and displayed normally. I know that Sage is using both MoinMoin and jsMath. If you would like to have that, I'd like to contribute. Or, if it was already done in your wiki by somebody else, I'd like to know how, so that I, maybe, could use that instead of my macro and formatter. It works just by adding #format math JsMath() at the top of a wiki page. Or replacing #format wiki (if it is present) with #format math, and then adding the second line the same as above. Please don't hesitate to experiment with that in http://mapleadvisor.com/cgi-bin/moin.cgi/JsMathTest and http://mapleadvisor.com/cgi-bin/moin.cgi/JsMathTest1 . Alec Mihailovs --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-devel] Promoting SAGE at Mapleprimes
I am trying to promote SAGE at Mapleprimes (in various threads). In addition to http://www.mapleprimes.com/forum/a110375 where Mike Hansen posted a comment at the end of the thread, there is a question from Alejandro Jakubi in http://www.mapleprimes.com/forum/clairautsyoungstheorem He asked whether SAGE is using Maxima or Axiom for calculus. I am not a SAGE developer (just a happy user), and I could say something wrong about that. Could somebody post there explaining that, please? Also, it would be nice to see another response in A110375 thread to keep in on the top of Recent posts list (that's what many people use - in the menu from the left hand side.) Thank you, Alec Mihailovs --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-devel] Re: New GMP for SAGE
From: Bill Hart [EMAIL PROTECTED] 5) Rewrite the x86 assembly to use NASM (possibly FASM, but there is a bootstrapping issue with the source code for that, NASM is written in C, so no bootstrapping problems there). Q. What about Apple and Microsoft support? A. We want to support Apple's XCode and Microsoft's MSVC as first class citizens and are willing to work around linker/compiler issues to a reasonable extent. Watch the list for further discussion of this. I'm not sure about Apple, but for Windows YASM seems to be a better choice than NASM. In particular, Brian Gladman used it for his Windows port of GMP and MPFR, see http://fp.gladman.plus.com/computing/gmp4win.htm Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-devel] Re: gmp 4.2.2 LGPL V3 issues and other minor tidbits
GPLv2 and GPLv3 are actually incompatible. You might think GPLvN should be compatible with GPLv(N-1) but that isnt the case here. At the moment, I think SAGE cannot be released under GPLv3. Ideally, the alternative to M* CASes should be released under more permissive license, such as MIT or new BSD. But the current situation seems to be far from ideal :( Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: gmp 4.2.2 LGPL V3 issues and other minor tidbits
In fact, it is impossible to combine GPLv2 only and LGPLv3 only code in they same project, under any license. Well, one possibility is to have GPLv2 in the main distribution and LGPLv3 as an optional package. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: gmp 4.2.2 LGPL V3 issues and other minor tidbits
Well, one possibility is to have GPLv2 in the main distribution and LGPLv3 as an optional package. Another possibility is to distribute SAGE-new parts under any of GPL2, GPL3, or GPL2 and later, and distribute all the rest as a collection of packages, each with its own license, without having a unique license for all of that. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: gmp 4.2.2 LGPL V3 issues and other minor tidbits
This is only perhaps ideal from the typical end user's point of view. The GPL-style license is greatly preferred over the BSD/MIT as the license for Sage by most Sage developers (this was discussed a lot at Sage Days 2). In fact, several of the top contributors to Sage have explicitly said they would not contribute to Sage if it were not licensed under the GPL. It's very important to these people, who put a massive amount of their time into Sage, that the code the write not just be copied into Mathematica/Maple/Magma, etc., and sold for profit, improved, etc., with nothing given in return. By the way, the GPL licensing, generally, is the main thing that prevents me personally from contributing to SAGE. I never put anything I wrote under GPL and I am not going to (at least at this moment.) Comparing to the danger of copying the code that I wrote to Mathematica, Maple, or Magma, the GPL licensing (and FSF copyrighting) seems to be much worse :) Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: gmp 4.2.2 LGPL V3 issues and other minor tidbits
Could you please elaborate on this a bit? What is it about the GPL that you don't like? If you were to contribute code to SAGE, what would be your ideal license? My ideal license would be MIT. I don't like the GPL in general. I read it a few times up to some point where I said to myself - no, that's not right, I can't go with that. At different times that was a different point, but I believe that I never went over the half of it. I have some negative personal experience with some of FSF people (that I don't want to share) though, so my opinion about the GPL may be biased. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: Calculus
- Original Message - From: William Stein One possibly nasty possibility would be to allow Magma-like notation: sage: [1..4] [1, 2, 3, 4] How does one specify an integer range in Maple, Mathematica, Maxima? In Maple it is similar to Magma, $1..4 produces 1,2,3,4. Also, .. is used for plots, sums, integrals et al. as plot(x^2,x=-1..1); int(x^2,x=-1..1); etc. -- Regarding latex, it would be great to have a simple description of how to use the notebook interface to produce a paper in latex incorporating sage input and output, That can be done more simple in texmacs with a SAGE session embedded. I think SAGE sessions can be added to LyX, too, but that seems to be not implemented yet. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: SAGE download stats -- how to increase SAGE usage?
From: Bill Page [EMAIL PROTECTED] As technically hard as it might be, I think having a native Windows version of Sage - even if it includes only a subset of the standard packages - would likely be a big factor in attracting more users. Being a Windows user, I can't agree less. Also, the notebook running in IE 7 would be much more attractive for many Windows users (including me) than in Firefox. Having even a subset of Sage available as a native Windows application would introduce many more users to Sage and probably motivate some of them to install Linux in order to access the full version. I always have few Linuxes installed, just for running programs (such as SAGE) that are not available in Windows. Still, it's not the same. I think the best tool for building a native Windows version of Sage is probably MSYS/MinGW which is really a cross-compiler and gnu tool set that provides a Linux-like environment only during the build. The end product is a native Windows application that does not depend on any Linux emulation layer. Unfortunately some of the standard packages in Sage can not be built in this way and to make matters worse, as far as I know the pexpect module that is required for interface with packages like Maxima has not been successfully ported to Windows. However, for Python extensions, the compiler should be the same as the compiler used to build Python - for Windows it is Visual Studio (Express is OK) 2005. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: SAGE download stats -- how to increase SAGE usage?
From: Bill Page [EMAIL PROTECTED] Being a Windows user, I can't agree less. ??? In my reading of English this sounds like you strongly disagree. :-( Yes, my English is not that great. Certainly I meant strongly agree :-) I am not sure if this is necessary but apparently Python can be built under MSYS/MinGW (I haven't tried this). See: I meant that the standard Windows Python available from python.org was built using Visual Studio 2005. I tried once to build it with Visual C++ Express 2005 (that is free as beer), and it worked fine, too. In general, I think that the best way for using Sage in Windows would be not to include such things as Python, Singular, GAP etc., but assume that users already have them, or are able to install them themselves - that would make porting much easier. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: SAGE download stats -- how to increase SAGE usage?
From: mabshoff [EMAIL PROTECTED] The compartmentilazation of SAGE has been suggested many times before, but as William has stated many times: This makes testing and debugging infinitely more diffcult. It is also extreme likely that if you use even minor different versions of certain packages like Maxima things no longer work properly. Just seems kinda strange to build the same versions of Python, clisp, gsl, gmp, Singular, etc. that are parts of cygwin distribution already. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: ams notices opinion column
From: Justin C. Walker [EMAIL PROTECTED] Tthere are large mounds of open source lying around for anyone to inspect. The unix kernel is one such (nowadays). Take a look :-} Justin, do you have a link? I just searched Google for Unix kernel sources and found the Unix V7 tour at http://www.tamacom.com/tour/kernel/unix/ . I looked at the main and few other files - the comments are very rare and mostly serve as section titles. It is as far from literate programming as it can be. The code seems to be very clean though and understandable. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: computing the number of partitions of an integer
From: Jonathan Bober [EMAIL PROTECTED] It's not quite ready for inclusion, but, eventually, maybe Bill Hart's prediction about it only taking 10 seconds to compute p(10^9) on sage.math will come true. That's fantastic! Great work! Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: ams notices opinion column
It is indeed *their* statement on the matter and it is what they strongly believe to be true. It's actually may be true (regarding to Mathematica). Their code may be very poorly commented (and AFAICT it is.) Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: ams notices opinion column
From: Alec Mihailovs [EMAIL PROTECTED] It actually may be true (regarding to Mathematica). Their code may be very poorly commented (and AFAICT it is.) And the motivation for doing that is very simple. If you (a developer) do it that way, so that you are the only one who could understand the code - less chances that you get fired. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: ams notices opinion column
From: William Stein [EMAIL PROTECTED] I think Jon Bober's code for number of partitions is a very nice example of how open source is so much better. Have a look at it some time; the comments are fascinating. And reading through the extremely interesting and extensive comments makes one start to *distrust* it a little, which is actually really good in a way. It's amazing how worried one can get about code when you actually read it! Yeah - I've read through it. Add 3 - just for luck was excellent! Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: usageof sage.
But,it needs vmware. Inside Microsoft that is not easy, can we use Microsoft's virtualpc or any other idea? Yes, I could definitely make a Microsoft virtualpc version of SAGE! I'll look into it when I get back -- or perhaps somebody on sage-devel who uses virtualpc and has run some sort of Linux in it could comment? I used SAGE from Virtual PC a few months ago. First, I installed Ubuntu there (with some tweaks that could be found on the web - I remember reading detailed step by step instructions), and then - the same as in plain Ubuntu, installed SAGE from the source there. Worked fine. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: computing the number of partitions of an integer
From: William Stein [EMAIL PROTECTED] Thanks. I've fixed this for sage = 2.7.3 in the attached patch. Just upgraded SAGE to 2.7.3 and number_of_partitions works twice as fast as in 2.7.2 with algorithm='bober' for 10^9 - it took 112 sec in 2.7.2 and only 56 sec in 2.7.3. This is in Ubuntu 7.04 on Dual Core 64-bit 2.6GHz Athlon with 2 GB RAM. By the way, to compare with other systems, SAGE 2.7.2 installation took about 53 minutes. I noticed the following interesting thing with time measuring: assigning number_of_partitions to a variable (that shouldn't take time at all), took about 10% or more of total time. For example, sage: time number_of_partitions(10^7) took about 0.8 sec while sage: time a=number_of_partitions(10^7) took slightly more than 1 sec. For 10^8 the corresponding times were 5 sec and 5.45 sec. That seems odd, isn't it? Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: opinion column for the Notices of the AMS
David Joyner and I are writing an opinion column for the Notices of the AMS on funding open source mathematical software. It must be at most 800 words, and we have a first rough draft. We have to finish it fairly quickly. I've attached the current version to this email. Feedback is very welcome! One suggestion is to replace your gmail email addresses in the signatures to the school email addresses. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: computing the number of partitions of an integer
From: Jonathan Bober [EMAIL PROTECTED] Incidentally, I should have mentioned here that I submitted a patch for version .4, and also updated it at http://www.math.lsa.umich.edu/~bober/partitions_c.cc It uses long doubles now when then precision is small enough (and then, later, just doubles like before), and the speedup is significant. By the way, I just installed SAGE 2.7.2 (from source) on my Ubuntu 7.04 system, with AMD Athlon 64 X2 5200+ and tested the version included there (using algorithm='bober'). It has the following feature - for input 2^32 it gave the ValueError saying that the input should be less than 2^64-2 (evaluated). Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Fw: Updated: singular-*-3.0.3-1
Singular 3.03 was included in Cygwin today. Are there plans to include it in SAGE? An interesting thing is that now it can be built as a library. Alec - Original Message - From: Oliver Wienand [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thursday, August 02, 2007 10:07 AM Subject: Updated: singular-*-3.0.3-1 Version 3.0.3-1 of Singular has been uploaded. About: SINGULAR is a Computer Algebra System for polynomial computations with special emphasis on the needs of commutative algebra, algebraic geometry, and singularity theory. Changes: The current version 3-0-3 is stabilyzing release, a result of a long beta test and the integration of a lot of small fixess which were on our waiting list for integration. The provided libraries and documentation were revisited. Singular 3-0-3 contains also a lot of new features: Licence: - licence changed: omalloc and MP are now (also) available under GPL; that means that all parts of SINGULAR are licenced under GPL (resp. LGPL). Porting: - factory, libfac, Singular updated for gcc 4.1.x - kernel updated for the optional use of boost. - Singular can now be built as a library. Kernel: - new operator a:b gives an intvec of length b with constant entries a - new command: ( chinrem): lifting via chinese remainder theorem - new command: ( interpolation): ideal of points with given multiplicities - non-commutative kernel subsystem was rewritten in order to support specific algebras more efficiently. Implemented algebras at the moment: super-commutative algebras (in particular exterior algebras). - std et al.: new selection strategy for reductions ( option (length)). - reduce: new strategy for selection and normalization. - simplify slightly changed: does not omit zero polynomial unless specified. Libraries: - new library: compregb.lib : comprehensive Groebner base system - new library: kskernel.lib : kernel of the kodaira-spencer map for irreducible plane curve singularities - new library: modstd.lib : Groebner base computations over the rational numbers via modular computations - new library: noether.lib : Noether normalization of an ideal(not nessecary homogeneous) - new library: atkins.lib : the elliptic curve primality test of Atkin - new library: aksaka.lib : primality testing after Agrawal, Saxena, Kayal - new library: arcpoint.lib : truncations of arcs at a singular point - new library: resgraph.lib : visualization of resolution data. - new library: realrad.lib : computation of the real radical over the rational numbers and extensions thereof - new library: hyperel.lib : divisors in the jacobian of hyperelliptic curves - new library: curvepar.lib : space curves - new library: sagbi.lib : subalgebras bases analogous to Groebner bases for ideals - new library: surfex.lib : visualizing and rotating surfaces - new library: cimonom.lib : determines if the toric ideal of an affine monomial curve is a complete intersection. - sheafcoh_lib: new experimental functions, in particular sheafCohBGG2 - library ncall.lib merged into all_lib - library center.lib renamed to central.lib - nctools_lib: new functions for super-commutative algebras (i.e. SuperCommutative, IsSCA, AltVarStart, AltVarEnd) - resolve.lib: blow ups revised - new algorithms in primdec.lib : radical et al. - improved version of slimgb, incorporated into groebner, strategy change in groebner - finvar.lib: the algorithm of secondary_char0 is now used in general in the non-modular case - finvar.lib: new algorithm for irred_secondary_char0 - finvar.lib: new function irred_secondary_no_molien - finvar.lib: new functions for computing minimal generating sets of invariant rings of finite groups in the non-modular case: invariant_algebra_reynolds for finite matrix groups and invariant_algebra_perm for permutation groups operation for sparse matrices improved: multiplication, prune, conversion to module If you have questions or comments, please send them to the Cygwin mailing list at: [EMAIL PROTECTED] . *** CYGWIN-ANNOUNCE UNSUBSCRIBE INFO *** If you want to unsubscribe from the cygwin-announce mailing list, look at the List-Unsubscribe: tag in the email header of this message. Send email to the address specified there. It will be in the format: [EMAIL PROTECTED] If you need more information on unsubscribing, start reading here: http://sources.redhat.com/lists.html#unsubscribe-simple Please read *all* of the information on unsubscribing that is available starting at this URL. --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] jsmath 3.4.c
jsMath3.4c is available, http://sourceforge.net/project/showfiles.php?group_id=172663 while SAGE is using 3.3 version, I think. By the way, I put Tex-fonts from http://www.math.union.edu/~dpvc/jsMath/download/jsMath-fonts.html and http://www.math.union.edu/~dpvc/jsMath/download/extra-fonts/welcome.html in the .fonts directory in my home directory and Firefox seems to be using them - I didn't test that, but the warning message in the notebook (about using image fonts) has disappeared. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: computing the number of partitions of an integer
Actually, even on my 32 bit core duo, the long double type seems to give 64 bits of precision, so using it might help a little. Do you have any idea how to check at run/compile time what the precision of a double or a long double is? Being an assembler programmer, I can say definitely that all FPU registers on x86 are 80-bit and all compilers that I know compile long double as 80-bit numbers. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: computing the number of partitions of an integer
From: Alec Mihailovs [EMAIL PROTECTED] Being an assembler programmer, I can say definitely that all FPU registers on x86 are 80-bit and all compilers that I know compile long double as 80-bit numbers. From other point of view, 80-bit real gives 64-bit precision in usual sense (mantissa), while a 64-bit double has 53-bit precision in usual sense. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: posible licence issue raised by GPL-v3
There is also a possibility to release a distribution under few different licenses - for example, a part as GPL3, a part as GPL 2, and a part as MIT or whatever. That, by the way, would allow including code from Microsoft Research. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: posible licence issue raised by GPL-v3
From: [EMAIL PROTECTED] Not always so. Verbatim snippet from the horse's mouth: When we say that GPLv2 and GPLv3 are incompatible, it means there is no legal way to combine code under GPLv2 with code under GPLv3 in a single program. This is because both GPLv2 and GPLv3 are copyleft licenses: each of them says, If you include code under this license in a larger program, the larger program must be under this license too. There is no way to make them compatible. We could add a GPLv2-compatibility clause to GPLv3, but it wouldn't do the job, because GPLv2 would need a similar clause. Fortunately, license incompatibility only matters when you want to link, merge or combine code from two different programs into a single program. There is no problem in having GPLv3-covered and GPLv2-covered programs side by side in an operating system. For instance, the TeX license and the Apache license are incompatible with GPLv2, but that doesn't stop us from running TeX and Apache in the same system with Linux, Bash and GCC. This is because they are all separate programs. Likewise, if Bash and GCC move to GPLv3, while Linux remains under GPLv2, there is no conflict. http://www.gnu.org/licenses/rms-why-gplv3.html Well, I wouldn't call SAGE a single program. Besides, that's exactly what commercial CAS's do. In particular, Maple includes gmp and a series of other programs under separate licenses. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: posible licence issue raised by GPL-v3
From: Bobby Moretti [EMAIL PROTECTED] Well, I wouldn't call SAGE a single program. The issue is complicated, and I doubt a lawyer would agree. Besides, that's exactly what commercial CAS's do. In particular, Maple includes gmp and a series of other programs under separate licenses. gmp is licensed under the GNU LGPL, which is GPL without the linking requirements, so Maple can do what they want, as long as they don't modify GMP. If they modify GMP, then they have to publish their changes under the LGPL, but they can leave the maple core alone. I agree that including gmp in Maple wasn't a good example. Nevertheless, SAGE AFAICT is a distribution of various programs rather than a single program. Something like, say, TEX Live, that doesn't have a single license, see http://www.tug.org/texlive/LICENSE.TL Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: posible licence issue raised by GPL-v3
From: Bobby Moretti [EMAIL PROTECTED] It would be one thing if SAGE was just a distribution of software, with a package management system. But SAGE contains (lots) of code that wraps these libraries and provides a unified interface to them. I'm fairly confident that this falls under the GPL's concept of 'linking'. That's not exactly clear (at least for me). Anyway - it seems mostly a theoretical problem. From practical point of view, if SAGE would use different FSF licences for different parts of it, it seems impossible that, say, PARI, or GAP, would sue it for that. Axiom - maybe (just a joke :), but it doesn't seem to be a part of SAGE. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: computing the number of partitions of an integer
From: Mike Hansen [EMAIL PROTECTED] I'm not sure where the bottleneck in PARI is since I can't imagine Mathematica uses a different method to compute the number of partitions. I don't know what is used in the latest Mathematica version, but originally NumberOfPartitions function in the Combinatorica package used the recursion with pentagonal numbers, see http://www.cs.uiowa.edu/~sriram/Combinatorica/NewCombinatorica.m Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: SAGE Documentation brainstorming
MediaWiki There is already a site that wove together Mathematica and MediaWiki. The same could probably be done for SAGE. Of course, that site hasn't done so well because the Mathematica user base is so small ... Assuming that SAGE's user base is larger? Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: SAGE Documentation brainstorming
May I suggest to add timing to the examples in the documentation - that would be very useful. For example, in recent discussion about Bell numbers on the math-fun list, it was noted that it takes a very long time to calculate bell(1000) in Maple while BellB[1000] in Mathematica is much faster. I looked at the corresponding section in SAGE Reference manual, http://modular.math.washington.edu/sage/doc/html/ref/module-sage.combinat.combinat.html and couldn't tell how much time it takes in SAGE (probably, rather long, because it wraps GAP's Bell.) Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: Kudos on a fabulous system!
Great! Make sure and subscribe to sage-support http://www.sagemath.org/lists.html The only problem is that both sage-devel and sage-support seem to be having too much of flooding - I am checking my mailbox right now and the amount of postings there is comparable with the amount of spam that I get. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: Kudos on a fabulous system!
William, Thank you! Fortunately this problem is very very easy to solve. Go to http://groups.google.com/group/sage-support/subscribe where you see that one option is to receive all messages as one batch per day That is what I should have been done from the very beginning. Alec PS Just read your reply to Richard Fateman - a very good reading (a great compensation for series of other not such interesting mailing list posts) -Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: ianal but...
(1) Is this license GPL compatible? It seems like it might be. It is very free (much more so than the GPL). What do you think? I couldn't find anything definitive online... One thing -- this license is very clear about patent issues, which is comforting. I am not ANAL, but it can be considered not as a law question, but as a simple mathematical problem. Every licence has 3 sets of statements: permissions, restrictions, and warranties. A license A is compatible for license B (i.e. code developed under license A can be included in the distribution licensed under licence B), if the set of restrictions of A is a subset of the set of restrictions of B, the set of permissions of B is a subset of the set of permissions of A, and the set of warranties of B is a subset of the set of warranties of A. While the Microsoft Permissive License permissions and warranties include all the GPL permissions and warranties, it has restrictions that are not present in GPL that makes it not GPL-compatible. Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: new matrix constructor
- Original Message - From: Kyle Schalm [EMAIL PROTECTED] here is a matrix constructor i would like to see: Matrix(M, N, f): for i in range(1,M+1): for j in range(1,N+1): self[i][j] = f(i,j) # or whatever the syntax is i might use it like this: A = Matrix(3, 3, lambda i,j: i+j) In numpy, there is a similar construction for arrays (starting from 0), fromfunction(f, (m,n)) It works rather slow for large arrays though (because f is evaluated in Python). Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] SAGE performance in cygwin
SAGE's version of Python in cygwin seem to be very slow. Look at the following time comparison for the following Python function, def m(n): : return [[j%n*n+(j+j-i)%n+1 : for j in range(i+(1-n)/2,i+(n+1)/2)] for i in range(n)] First - in cygwin's ipython running cygwin's python, In [7]: time a=m(201) CPU times: user 0.03 s, sys: 0.00 s, total: 0.03 s Wall time: 0.04 In [8]: time a=m(1001) CPU times: user 0.83 s, sys: 0.02 s, total: 0.84 s Wall time: 0.86 Now - in SAGE, sage: time a=m(201) CPU times: user 1.83 s, sys: 1.38 s, total: 3.20 s Wall time: 3.23 sage: time a=m(1001) CPU times: user 44.34 s, sys: 37.17 s, total: 81.51 s Wall time: 81.77 Alec Mihailovs http://mihailovs.com/Alec/ --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: SAGE performance in cygwin
From: William Stein [EMAIL PROTECTED] If you're using the SAGE command prompt, it's important to either set the constants outside of the loop (they all get wrapped in Integer( ... ), which slows things down), or put an r after them to make them raw literals.(We intend to automatically factor out setting of constants, but haven't implemented that yet.) Yes, I was wrong. sage -ipython (with SAGE's python) produces about the same timing as cygwin's python (as in Justin C. Walker's earlier reply) In [4]: time a=m(201) CPU times: user 0.02 s, sys: 0.00 s, total: 0.02 s Wall time: 0.04 In [5]: time a=m(1001) CPU times: user 0.88 s, sys: 0.00 s, total: 0.88 s Wall time: 0.88 So what is the correct way to define m(n) in SAGE? Such things as m(201r) and m(1001r) work as slow as m(201) and m(1001), sage: time a=m(201r) CPU times: user 1.72 s, sys: 0.67 s, total: 2.39 s Wall time: 2.51 sage: time a=m(1001r) CPU times: user 47.06 s, sys: 20.03 s, total: 67.09 s Wall time: 68.89 Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: SAGE performance in cygwin
William, It appears that you answered to that question before I asked it. Thank you very much! That was very useful. With this version of m SAGE produces (odd) magic squares faster than Octave, octave:1 t=cputime();a=magic(201);cputime()-t ans = 0.32800 octave:2 t=cputime();a=magic(1001);cputime()-t ans = 4.1410 Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
[sage-devel] Re: maple and cygwin
From: Jaap Spies [EMAIL PROTECTED]
Changed that line in '/cygdrive/c/Program\ Files/Maple\
9/bin.win/cmaple9.exe $@'
I have it as
/cygdrive/c/Program Files/Maple 10/bin.win/cmaple.exe $*
Now sage: maple.console() works.
But still sage: maple('1+1') doesn't work.
Alec
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[sage-devel] Re: maple and cygwin
From: Jaap Spies [EMAIL PROTECTED] Using Maple with Cygwin: [EMAIL PROTECTED] ~/sage $ /cygdrive/c/Program\ Files/Maple\ 9/bin.win/cmaple9.exe -t #-- #-- 1+1; #--1+1; 2 quit; #--quit; bytes used=150424, alloc=196572, time=0.08 I copied a file with contents '/cygdrive/c/Program\ Files/Maple\ 9/bin.win/cmaple9.exe -t' to /usr/local/bin There seems to be an issue with CR-LF or something. That seems to be an issue with rxvt, too - in the cmd shell I see the same behavior as in Linux, $ maple -t #--1+1; 2 #--quit bytes used=297088, alloc=327620, time=0.03 I usually prefer maple -q instead of maple -t. It works better as a filter and the output is prettyprinted, $ echo 1+1; | maple -q 2 When run from within sage, sage waits and never gets the prompt #-- I can confirm that. sage: !maple -q works OK though (without a prompt). Alec --~--~-~--~~~---~--~~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~--~~~~--~~--~--~---
