[sage-support] Re: strange behavior
On Mon, Jun 15, 2009 at 6:07 AM, Florian Beutlerflorian.beut...@gmx.de wrote: hello flor...@florian-laptop:~/Gadget-2.0.3/Analysis$ sage -v | SAGE Version 3.0.5, Release Date: 2008-07-11 my operation system is ubuntu 9,04 What are the paths below to /usr/lib? I don't know what you mean... regards florian You should apt-get remove sagemath, then install sage from source or one of the binaries at http://sagemath.org/. The Sage included in Debian/Ubuntu is extremely out of date. William On Jun 14, 10:00 pm, William Stein wst...@gmail.com wrote: On Sun, Jun 14, 2009 at 6:48 AM, Florian Beutlerflorian.beut...@gmx.de wrote: yep sorry... here is the error message What version of Sage are you using? On what computer? Etc. etc. What are the paths below to /usr/lib? -- William flor...@florian-laptop:~/sage$ sage friction.py Ok... dann legen wir mal los! step1: definition of the density profile 99824085.5683 step2: definition of the circular velocity 3.51331142172386 step3: definition of the integrated mass 229643.853879355 step3: definition of the integrated mass Traceback (most recent call last): File friction.py, line 29, in module print mass(r).n(),\n File /home/florian/sage/functions.py, line 21, in mass i_term = integral(x**2*rho(x), x, 0, r) File /usr/lib/python2.5/site-packages/sage/misc/functional.py, line 436, in integral return x.integral(*args, **kwds) File /usr/lib/python2.5/site-packages/sage/calculus/calculus.py, line 2508, in integral return self.parent()(self._maxima_().integrate(v, a, b)) File /usr/lib/python2.5/site-packages/sage/interfaces/maxima.py, line 1601, in integral return I(var, min, max) File /usr/lib/python2.5/site-packages/sage/interfaces/expect.py, line 1182, in __call__ return self._obj.parent().function_call(self._name, [self._obj] + list(args)) File /usr/lib/python2.5/site-packages/sage/interfaces/expect.py, line , in function_call return self.new(%s(%s)%(function, ,.join([s.name() for s in args]))) File /usr/lib/python2.5/site-packages/sage/interfaces/expect.py, line 1013, in new return self(code) File /usr/lib/python2.5/site-packages/sage/interfaces/maxima.py, line 377, in __call__ return Expect.__call__(self, x) File /usr/lib/python2.5/site-packages/sage/interfaces/expect.py, line 948, in __call__ return cls(self, x) File /usr/lib/python2.5/site-packages/sage/interfaces/expect.py, line 1214, in __init__ self._name = parent._create(value) File /usr/lib/python2.5/site-packages/sage/interfaces/expect.py, line 1092, in _create self.set(name, value) File /usr/lib/python2.5/site-packages/sage/interfaces/maxima.py, line 855, in set self._eval_line(cmd) File /usr/lib/python2.5/site-packages/sage/interfaces/maxima.py, line 567, in _eval_line self._expect_expr() File /usr/lib/python2.5/site-packages/sage/interfaces/maxima.py, line 457, in _expect_expr i = self._expect.expect(expr) File /usr/lib/python2.5/site-packages/pexpect.py, line 1311, in expect return self.expect_list(compiled_pattern_list, timeout, searchwindowsize) File /usr/lib/python2.5/site-packages/pexpect.py, line 1325, in expect_list return self.expect_loop(searcher_re(pattern_list), timeout, searchwindowsize) File /usr/lib/python2.5/site-packages/pexpect.py, line 1396, in expect_loop raise EOF (str(e) + '\n' + str(self)) pexpect.EOF: End Of File (EOF) in read_nonblocking(). Exception style platform. pexpect.spawn object at 0x3cfe890 version: 2.3 ($Revision: 399 $) command: /usr/bin/maxima args: ['/usr/bin/maxima', '-p', '/usr/lib/sagemath/local/bin/sage- maxima.lisp'] searcher: searcher_re: 0: re.compile(\(\%i[0-9]+\)) 1: re.compile(zero or nonzero?) 2: re.compile(an integer?) 3: re.compile(positive, negative, or zero?) 4: re.compile(positive or negative?) 5: re.compile(Break [0-9]+) buffer (last 100 chars): before (last 100 chars): `rat' replaced 1.0 by 1/1 = 1.0 `rat' replaced 1.234567901234568 by 100/81 = 1.234567901234568 after: class 'pexpect.EOF' match: None match_index: None exitstatus: None flag_eof: True pid: 4147 child_fd: 3 closed: False timeout: None delimiter: class 'pexpect.EOF' logfile: None logfile_read: None logfile_send: None maxread: 1 ignorecase: False searchwindowsize: None delaybeforesend: 0 delayafterclose: 0.1 delayafterterminate: 0.1 Maxima crashed -- automatically restarting. End Of File (EOF) in read_nonblocking(). Exception style platform. pexpect.spawn object at 0x3cfe890 version: 2.3 ($Revision: 399 $) command: /usr/bin/maxima args: ['/usr/bin/maxima', '-p', '/usr/lib/sagemath/local/bin/sage- maxima.lisp'] searcher: searcher_re: 0: re.compile(\(\%i[0-9]+\)) buffer (last 100 chars): before (last 100 chars): after: class
[sage-support] Re: Mac OS X 10.4 32bit G4 Support
I've tried ./sage -bdist 4.0.1-OSX10.4-PowerPC, the new Sage folder is now 1.36GB and the .dmg file dwindled to 365MB: http://n.ethz.ch/student/lukasre/download/ Sorry for waisting your time. Regards, Lukas --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Mac OS X 10.4 32bit G4 Support
I've tried ./sage -bdist 4.0.1-OSX10.4-PowerPC, the new Sage folder is now 1.36GB and the .dmg file dwindled to 365MB: http://n.ethz.ch/student/lukasre/download/ Sorry for wasting your time. Regards, Lukas --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: www.sagenb.org vs alpha.sagenb.org
The main purpose of my email was to make a point about trusting the
answers being crucial to the sage project. After sending the email I
realised another viewpoint: if you stuck to a safe version of sage
on sagenb.org, few people would use the alpha server and you'd lose a
great opportunity to find bugs in the latest releases, which is a pay-
off for providing the computational resources of sagenb.org.
True. jokeAlso if we stuck to a safe version of Sage, it might
look like this:
#includestdio.h
int main(void) {
printf(sage: \n);
}
/joke :-)
-- William
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[sage-support] Re: Posting in sage-windows
On Mon, Jun 15, 2009 at 1:04 AM, kilucaskevin.lu...@concave.co.uk wrote: My apologies for posting about the sage-windows group within the sage- support group but I posted 3 messages (two replies and a new topic) into sage-windows a couple of weeks back and they're still not showing up in the message lists. And I wasn't sure how else to ask for help in posting there. I'm listed as a member of that group and did get an email notification that some messages had been posted. So do I need to do anything special to post there perhaps? That was my mistake. I'm really sorry for your message not getting posted promptly. It should in the future. William Thanks Kevin -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Dimensional Analysis or Unit Conversion capability?
I am wondering whether somebody contacted the author. Let me cite him (everything is better explained in the wiki): - I have another idea for further development, which is more technical. It is to remove the unit dictionary stored as Unum's class attributes (which is the cornerstone of the current design !). Currently, the unit symbol strings are used as keys for this dictionary; numerous dictionary lookups may occur at unit normalization or unification. The idea now is that each unum contains direct references to other unums representing its inner units. More precisely, basic units (as meter, second, etc) are, by definition, terminal unums (without references); derived units (as Newton, Joule, etc) have a dictionary with, as keys, unums representing basic/derived units, and, as values, their exponents; finally, any quantity may be derived with the same idea. The big picture at the end is that all quantities, units and conversion rules boils down to a single connected graph where each node is a unum. This redesign should save a lot in time and memory consumption. It requires however to rewrite almost all Unum's methods. I wrote a small prototype to validate the concept, with promising results. This is coming from the last entry of Unum Diary ( http://home.scarlet.be/be052320/Unum_diary.html ). Do you think could be possible for us to get the prototype from him, and to adapt it to work with SAGE, in order to take advantage of his experience in designing a Units of Measurement package, and at the same time to get the chance to make it work well with SAGE in the early phase of its development? The result could be the same to make Quantities work with SAGE, but I am doubtful if it would take less time to make Quantities work well in SAGE, rather than adopt this Unum (let's say 5.0 alpha) and possibly invite the original author to cooperate with us, if he's willing to and has some spare time. Regards Maurizio On Jun 15, 12:10 am, Maurizio maurizio.gran...@gmail.com wrote: I added some comments to the wiki about Quantities as well. From the point of view of the code, I can give my impression, but I'm not experienced in programming. Unum looks simple and understandable. Quantities looks more complex, and even finding the right way to look at is difficult for me. Anyway, this could also mean that the package is refined and designed from an experienced programmer, so this could be a pro. Anyway, that would certainly prevent people like me to work on it :) Regards Maurizio On 14 Giu, 23:38, Maurizio maurizio.gran...@gmail.com wrote: as is going to be a keyword in Python 2.6 so this will actually have to be changed. It makes sense to do it before it's in Sage since it will break code. Yes, indeed that's even coming out when executing its own test suite: Python is warning that as is a keyword in 2.6. Note that the license is GPLv2, not GPLv2+, http://home.scarlet.be/be052320/license.txt Maybe someone should contact the package author about that before a definite move is made? All of the license statements on the source code itself are GPLv2+. There are also a few changes that should to be done such as something like try: from sage.all import Integer ONE = Integer(1) except ImportError: ONE = 1.0 so that it plays nicer with exact arithmetic. --Mike William, as I stated in the wiki, I'm gaining interest toward Unum. I was going to include some examples of Quantites in SAGE as well (for par condicio, as they say in Italy). I don't know what about contacting the author or modifying the code, but please consider also the effort needed to make it work with the non-arithmetic functions: 1. trigonometric 2. integration, derivation 3. possibly compatibility with symbolics? I would consider point (1) the minimum necessary to avoid making Unum (or any other units package) inclusion meaningless. Thanks for the interest, anyway Regards Maurizio --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Dimensional Analysis or Unit Conversion capability?
On Mon, Jun 15, 2009 at 12:24 PM, Mauriziomaurizio.gran...@gmail.com wrote: I am wondering whether somebody contacted the author. Let me cite him (everything is better explained in the wiki): - I have another idea for further development, which is more technical. It is to remove the unit dictionary stored as Unum's class attributes (which is the cornerstone of the current design !). Currently, the unit symbol strings are used as keys for this dictionary; numerous dictionary lookups may occur at unit normalization or unification. The idea now is that each unum contains direct references to other unums representing its inner units. More precisely, basic units (as meter, second, etc) are, by definition, terminal unums (without references); derived units (as Newton, Joule, etc) have a dictionary with, as keys, unums representing basic/derived units, and, as values, their exponents; finally, any quantity may be derived with the same idea. The big picture at the end is that all quantities, units and conversion rules boils down to a single connected graph where each node is a unum. This redesign should save a lot in time and memory consumption. It requires however to rewrite almost all Unum's methods. I wrote a small prototype to validate the concept, with promising results. This is coming from the last entry of Unum Diary ( http://home.scarlet.be/be052320/Unum_diary.html ). Do you think could be possible for us to get the prototype from him, and to adapt it to work with SAGE, in order to take advantage of his experience in designing a Units of Measurement package, and at the same time to get the chance to make it work well with SAGE in the early phase of its development? The result could be the same to make Quantities work with SAGE, but I am doubtful if it would take less time to make Quantities work well in SAGE, rather than adopt this Unum (let's say 5.0 alpha) and possibly invite the original author to cooperate with us, if he's willing to and has some spare time. Well it can't hurt to write to him and ask what he thinks... There is also the fact that Sage has rings, elements, parents, a coercion model, etc. which might throw a monkey wrench into everything (I don't know). -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: linbox bug?
On Wed, Jun 10, 2009 at 6:03 PM, Yannyannlaiglecha...@gmail.com wrote:
--
| Sage Version 4.0.1, Release Date: 2009-06-06 |
| Type notebook() for the GUI, and license() for information. |
--
sage: A=matrix(GF(3),2,[0,0,1,2])
sage: R.x=GF(3)[]
sage: D={ x:0 , x+1:0 , x^2+x:0 }
sage: for i in range(10):
: D[A._minpoly_linbox()]+=1
:
sage: D
{x: 38266, x + 1: 29397, x^2 + x: 32337}
You're absolutely right! This *sucks* -- it seems like nothing we
have ever wrapped in Linbox is right at first. Hopefully the issue is
that somehow the algorithm is only supposed to be probabilistic, and
we're just misusing it in sage (quite possible).
Anyway, Clement Pernet will be at Sage Days next week, and we'll sort this out.
Many thanks for brining this to our attention!
This is now:
http://trac.sagemath.org/sage_trac/ticket/6296
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[sage-support] drawing graphs
Hello!
I'm a newcomer into Sage and Python. When I want to draw some
graphical
representation of graphs I get problems : the vertices are partially
cut-off. They almost disappear when the graph looks like a vertical
ladder. For example:
arbre1={0:[1],1:[]}
arbre2={0:[1,2],1:[],2:[]}
A1=Graph(arbre1)
AA1=A1.plot(vertex_size=120, layout=tree,
tree_orientation=up,tree_root=0)
A2=Graph(arbre2)
AA2=A2.plot(vertex_size=120, layout=tree,
tree_orientation=up,tree_root=0)
AA1.show(figsize=[2,2]);AA2.show(figsize=[2,2])
How can I cure this?
Another related question : which values are allowed for figsize[-,-]?
Very
often I would like quite tiny drawings (hence small values) but then I
get
an error message. For example the same as above with figsize=[1,1]
returns
the message below. Why?
Thanks in advance for the help.
Dominique Manchon
libpng error: Image width or height is zero in IHDR
Traceback (most recent call last):
File stdin, line 1, in module
File /home/sage/sagenb/sage_notebook/worksheets/manchon/4/code/
24.py,
line 13, in module
AA1.show(figsize=[_sage_const_1 ,_sage_const_1
]);AA2.show(figsize=[_sage_const_1 ,_sage_const_1 ])
File
/home/sage/sage_install/sage/local/lib/python2.5/site-packages/
Jinja-1.2-py2.5-linux-x86_64.egg/,
line 1, in module
File
/home/sage/sage_install/sage/local/lib/python2.5/site-packages/sage/
plot/plot.py,
line 1291, in show
hgridlinesstyle=hgridlinesstyle)
File
/home/sage/sage_install/sage/local/lib/python2.5/site-packages/sage/
plot/plot.py,
line 1616, in save
canvas.print_figure(filename, dpi=dpi)
File
/home/sage/sage_install/sage/local/lib/python2.5/site-packages/
matplotlib/backend_bases.py,
line 1453, in print_figure
**kwargs)
File
/home/sage/sage_install/sage/local/lib/python2.5/site-packages/
matplotlib/backends/backend_agg.py,
line 334, in print_png
filename_or_obj, self.figure.dpi)
RuntimeError: Error building image
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[sage-support] Re: Inheritance from sage.symbolic.expression.Expression
Dear Burcin
Thanks for all
It seems the patch works fine for my application, at least this is
what the first tests says !
I will get back to here if I see issues
Nicolas
On 12 juin, 11:22, Burcin Erocal bur...@erocal.org wrote:
Hi Nicolas,
On Fri, 12 Jun 2009 02:09:08 -0700 (PDT)
Nicolas nicolas.fresseng...@gmail.com wrote:
Just one quick question about patches, I have just changed the
expression.pyx file and ran another make (which took not so much
time). But it does not seem to work. Is this simple way of applying
patch enough or do I have to go through the mercurial system ?
You need to do
./sage -br
From your other message:
I will try out your patch. Why do you say that does not solve my
problem ?
You'll see that whenever you perform arithmetic on the new objects,
you'll end up with Expression's again.
assuming the class esub was defined as in my previous message
sage: var('x,y,z')
(x, y, z)
sage: t = x * y^z
sage: u = esub(SR, t)
sage: u
y^z*x
sage: type(u)
class '__main__.esub'
sage: type(u*u)
type 'sage.symbolic.expression.Expression'
Let's see how far you get with the patch. I'll try to see if there is
a simple fix to make Expression behave well w.r.t. object oriented
design.
Cheers,
Burcin
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[sage-support] Re: drawing graphs
On Mon, Jun 15, 2009 at 12:55 PM, Dominique
Manchonmanc...@math.univ-bpclermont.fr wrote:
Hello!
I'm a newcomer into Sage and Python. When I want to draw some
graphical
representation of graphs I get problems : the vertices are partially
cut-off. They almost disappear when the graph looks like a vertical
ladder. For example:
Despite years of work, drawing graphs in Sage is still pretty broken.
This is very clear to anybody who uses the Sage graph code for any
amount of time.
The graph plotting works well for:
* circular planar graphs
* all the graphs you get by typing graphs.tab key (thanks Emily)
* sometimes for connected graphs.
It's *terrible* for graphs with multiple components. And for random
small graphs, as you say it chops off vertices, and generally looks
very unpolished.
My understanding is that the following work has been done on graph
plotting in Sage:
* take the networkx graph plotting code and make it actually work from sage
* nice layouts for everything in graphs.tab key
* make it so the spring layout algorithm runs very very quickly
* add support for loops and multiple edges (thanks emily)
* add a layout=circular algorithm
* add a layout=tree algorithm
* lots of support for colorings (in sage-4.0.1)
It's pretty clear substantial further work is still needed. I taught
an undergrad course last quarter using Sage, and found plotting with
anything but layout=circular to be sort of embarrassing. But I
didn't do anything about it.
Please -- Emily and Robert -- don't be at all offended by this email.
You two have both dramatically improved graph plotting in Sage over
what networkx offers, and Emily's predesigned layouts for the graph
families are beautiful.I just think it is important to acknowledge
that on random input graphs plotting has a ways to go.
-- William
arbre1={0:[1],1:[]}
arbre2={0:[1,2],1:[],2:[]}
A1=Graph(arbre1)
AA1=A1.plot(vertex_size=120, layout=tree,
tree_orientation=up,tree_root=0)
A2=Graph(arbre2)
AA2=A2.plot(vertex_size=120, layout=tree,
tree_orientation=up,tree_root=0)
AA1.show(figsize=[2,2]);AA2.show(figsize=[2,2])
How can I cure this?
Another related question : which values are allowed for figsize[-,-]?
Very
often I would like quite tiny drawings (hence small values) but then I
get
an error message. For example the same as above with figsize=[1,1]
returns
the message below. Why?
Thanks in advance for the help.
Dominique Manchon
libpng error: Image width or height is zero in IHDR
Traceback (most recent call last):
File stdin, line 1, in module
File /home/sage/sagenb/sage_notebook/worksheets/manchon/4/code/
24.py,
line 13, in module
AA1.show(figsize=[_sage_const_1 ,_sage_const_1
]);AA2.show(figsize=[_sage_const_1 ,_sage_const_1 ])
File
/home/sage/sage_install/sage/local/lib/python2.5/site-packages/
Jinja-1.2-py2.5-linux-x86_64.egg/,
line 1, in module
File
/home/sage/sage_install/sage/local/lib/python2.5/site-packages/sage/
plot/plot.py,
line 1291, in show
hgridlinesstyle=hgridlinesstyle)
File
/home/sage/sage_install/sage/local/lib/python2.5/site-packages/sage/
plot/plot.py,
line 1616, in save
canvas.print_figure(filename, dpi=dpi)
File
/home/sage/sage_install/sage/local/lib/python2.5/site-packages/
matplotlib/backend_bases.py,
line 1453, in print_figure
**kwargs)
File
/home/sage/sage_install/sage/local/lib/python2.5/site-packages/
matplotlib/backends/backend_agg.py,
line 334, in print_png
filename_or_obj, self.figure.dpi)
RuntimeError: Error building image
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
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[sage-support] Re: Multiply first terms of Dirichlet powerseries
On Wed, Jun 10, 2009 at 4:14 PM, Ton Biegstraatenton.biegstraa...@gmail.com wrote: Hi, As an example I multiplied the first terms of 2 Dirichlet powerseries. The result is also a Dirichlet powerserie, but how do I get the result in that shape? --- sage: a(x) = sum([1/(n^x) for n in range(1,4)]) sage: b(x) = a(x)*a(x) sage: print a(x): ,a(x), \nproduct: , a(x)*a(x), \nb(x): , b(x).expand() a(x): 1/2^x + 1/3^x + 1 product: (1/2^x + 1/3^x + 1)^2 b(x): 2/2^x + 1/(2^x)^2 + 2/3^x + 2/(2^x*3^x) + 1/(3^x)^2 + 1 --- I like to get things like 2^x*3^x = 6^x and combine all n^x terms, as I'm only interested in the denominators of that terms. The result should be: 1 + 2/2^x + 2/3^x + 3/4^x ... each denominator is the number of divisors of the number in the nominator if you use enough terms in the original series. Is that possible and of course how? You should read this wiki page, which should explain to you how to code up the Dirichlet convolution, hence explicit form of product of two Dirichlet series as a Dirichlet series: http://en.wikipedia.org/wiki/Dirichlet_convolution William --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
Re: [linbox-devel] Re: [sage-support] linbox bug?
2009/6/15 Jean-Guillaume Dumas jean-guillaume.du...@imag.fr:
William Stein wrote:
On Wed, Jun 10, 2009 at 6:03 PM, Yannyannlaiglecha...@gmail.com wrote:
--
| Sage Version 4.0.1, Release Date: 2009-06-06 |
| Type notebook() for the GUI, and license() for information. |
--
sage: A=matrix(GF(3),2,[0,0,1,2])
sage: R.x=GF(3)[]
sage: D={ x:0 , x+1:0 , x^2+x:0 }
sage: for i in range(10):
: D[A._minpoly_linbox()]+=1
:
sage: D
{x: 38266, x + 1: 29397, x^2 + x: 32337}
You're absolutely right! This *sucks* -- it seems like nothing we
have ever wrapped in Linbox is right at first. Hopefully the issue is
that somehow the algorithm is only supposed to be probabilistic, and
we're just misusing it in sage (quite possible).
Anyway, Clement Pernet will be at Sage Days next week, and we'll sort this
out.
Many thanks for brining this to our attention!
This is now:
http://trac.sagemath.org/sage_trac/ticket/6296
Well, I think this was corrected in linbox-1.1.6:
We're using linbox-1.1.6 in Sage.
The minpoly algorithm used depends on which method you are using from
LinBox of course but,
If you use the solution minpoly you will get the blackbox algorithm
(just like if you specify minpoly(pol, mat, Method::Blackbox()))
then (since sept 2008 and 1.1.6) we will end up using an extension field
to compute the minpoly (on my machine it will be GF(3^10)) and then
I e.g. got the following result for one try (the algorithm is still
probabilistic, but has a much larger success rate, roughly around 1/3^10):
Here's what we're using:
void linbox_modn_dense_minpoly(mod_int modulus, mod_int **mp, size_t*
degree, size_t n, mod_int **matrix, int do_minpoly) {
ModInt F((double)modulus);
size_t m = n;
DenseMatrixModInt A(linbox_new_modn_matrix( modulus, matrix, m, m));
GivPolynomialModInt::Element m_A;
if (do_minpoly)
minpoly(m_A, A);
else
charpoly(m_A, A);
(*mp) = new mod_int[m_A.size()];
*degree = m_A.size() - 1;
for (size_t i=0; i = *degree; i++) {
(*mp)[i] = (mod_int)m_A[i];
}
}
This is from the file interfaces/linbox-sage.C, which ships with linbox.
Many thanks for clarifying that minpoly fails with some probability,
and that we need to call it multiple times, take lcm's, and force the
user to give the option proof=False to use it.
Just out of curiosity, is there any provably correct minpoly in
linbox? We don't have one in Sage at all, so it would be useful so
we don't have to implement one from scratch.
William
3 minimal Polynomials are x^2 +x, 3 minimal polynomial are x+1, 4
minimal polynomials are x
Now for a so small matrix it could be better to use a dense version,
which can be called by minpoly(pol,mat,Method::Elimination()).
If i am correct this dense version is also probabilistic (choice of the
Krylov non-zero vector) and therefore should also pick vectors from an
extension.
This is not the case in 1.1.6.
Clément can you confirm this ? If so it should be easy to fix, the same
way we fixed Wiedemann.
For your example matrix in some of the cases, when vectors [1,1], and
[2,2] are chosen the Krylov space has rank 1, whereas for other non zero
vectors it has rank 2 and
thus the dense minbpoly will be x^2+x or x+1 ...
btw, the returned polynomial is always a factor of the true polynomial,
therefore to get a 1/3^{10k} probability of success it will be
sufficient to perform the lcm of k runs.
Best,
--
Jean-Guillaume Dumas.
jean-guillaume.du...@imag.fr Tél.: +33 476 514 866
Université Joseph Fourier, Grenoble I. Fax.: +33 476 631 263
Laboratoire Jean Kuntzmann, Mathématiques Appliquées et Informatique
51, avenue des Mathématiques. LJK/IMAG - BP53. 38041 Grenoble FRANCE
http://ljk.imag.fr/membres/Jean-Guillaume.Dumas
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
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[sage-support] Re: Using multiple cores with Sage under VMWare Player
On Tue, Jun 9, 2009 at 4:44 AM, James Parsonpar...@hood.edu wrote: Here's a really dumb thing you could do. (1) Make a copy of sage-vmware-* to another directory. (2) Run both vmware's at the same time. That'll definitely use both cores on your computer. Indeed! That's what I ended up doing this afternoon. I had VMWare Workstation make a clone of my Sage virtual machine. For some reason, when I tried simply making a copy of Sage in another directory (before I tried Workstation), I couldn't get it to run. Whenever I tried to start it up a second copy, something would flash on the screen, vanishing before I could read it, and the notebook system would not run. Probably I was doing something foolish. Is there any direct way to share Sage worksheets between two virtual machines, or is it simplest to save the files from one system and load them into another? There is no straightforward way to share worksheets right now between virtual machines. William --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] notebook.setup() problem
Hello everyone, I am very new to the sage. I tried to use the sage from a remote client. On that regard, I am running the Sage 4.0.1 on OpenSUSE 11.1 64bit edition. However when I am trying to run notebook with 'secure=True' option, it gives errors which looks like coming from notebook.setup(). Following lines are from when I trying this process with freshly installed sage. Any idea or hint will be highly appreciated! lenie...@lenient7:~/bin/sage-4.0.1 ./ sage -- | Sage Version 4.0.1, Release Date: 2009-06-06 | | Type notebook() for the GUI, and license() for information. | -- The SAGE install tree may have moved. Regenerating Python.pyo and .pyc files that hardcode the install PATH (please wait at most a few minutes)... Do not interrupt this. sage: notebook.setup() Using dsage certificates. --- NameError Traceback (most recent call last) /home/lenient7/bin/sage-4.0.1/ipython console in module() /home/lenient7/bin/sage-4.0.1/local/lib/python2.5/site-packages/sage/ server/notebook/run_notebook.py in notebook_setup(self) 39 print Using dsage certificates. 40 dsage = os.path.join(DOT_SAGE, 'dsage') --- 41 sage.dsage.all.dsage.setup () 42 shutil.copyfile(dsage + '/cacert.pem', private_pem) 43 shutil.copyfile(dsage + '/pubcert.pem', public_pem) NameError: global name 'sage' is not defined --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: notebook.setup() problem
On Mon, Jun 15, 2009 at 5:03 PM, lenient7lenie...@gmail.com wrote: Hello everyone, I am very new to the sage. I tried to use the sage from a remote client. On that regard, I am running the Sage 4.0.1 on OpenSUSE 11.1 64bit edition. However when I am trying to run notebook with 'secure=True' option, it gives errors which looks like coming from notebook.setup(). It's completely broken. This is a new bug in Sage-4.0, which was introduced by factoring dsage out from the core sage library, I think by Mike Hansen. I've opened a blocker ticket for this: http://trac.sagemath.org/sage_trac/ticket/6299 I hope Mike will fix this, or if not him, then somebody. It shouldn't be hard. In the meantime, you'll unfortunately have to wait a little, or try to fix the problem yourself. The fix is probably just to stick some import statement somewhere obvious. Following lines are from when I trying this process with freshly installed sage. Any idea or hint will be highly appreciated! lenie...@lenient7:~/bin/sage-4.0.1 ./ sage -- | Sage Version 4.0.1, Release Date: 2009-06-06 | | Type notebook() for the GUI, and license() for information. | -- The SAGE install tree may have moved. Regenerating Python.pyo and .pyc files that hardcode the install PATH (please wait at most a few minutes)... Do not interrupt this. sage: notebook.setup() Using dsage certificates. --- NameError Traceback (most recent call last) /home/lenient7/bin/sage-4.0.1/ipython console in module() /home/lenient7/bin/sage-4.0.1/local/lib/python2.5/site-packages/sage/ server/notebook/run_notebook.py in notebook_setup(self) 39 print Using dsage certificates. 40 dsage = os.path.join(DOT_SAGE, 'dsage') --- 41 sage.dsage.all.dsage.setup () 42 shutil.copyfile(dsage + '/cacert.pem', private_pem) 43 shutil.copyfile(dsage + '/pubcert.pem', public_pem) NameError: global name 'sage' is not defined -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] ANN: openopt 0.24 - free numerical optimization framework
Hi all, OpenOpt 0.24, a free Python-written numerical optimization framework with some own solvers and connections to tens of 3rd party ones, has been released. BSD license allows to use it in both free opensource and commercial closed-code software. Currently we have ~80 unique visitors daily, 15% of the ones visit installation webpage, and some more install it via PYPI, Debian and Alt Linux repository, mac.softpedia.com, darwinports.com, pythonxy.com, mloss.org. Our homepage: http://openopt.org Introduction to the framework: http://openopt.org/Foreword All release details are here: http://openopt.org/Changelog or http://forum.openopt.org/viewtopic.php?id=110 Regards, OpenOpt developers. --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Posting in sage-windows
My apologies for posting about the sage-windows group within the sage- support group but I posted 3 messages (two replies and a new topic) into sage-windows a couple of weeks back and they're still not showing up in the message lists. And I wasn't sure how else to ask for help in posting there. I'm listed as a member of that group and did get an email notification that some messages had been posted. So do I need to do anything special to post there perhaps? That was my mistake. I'm really sorry for your message not getting posted promptly. It should in the future. And just for the record -- when the behavior on one of the other groups is funky, emailing sage-support isn't a bad idea at all. :) (In this case, it was exactly the right move to fix the problem ... and now several of us can approve messages on sage-windows, meaning it shoudn't happen again.) --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: notebook.setup() problem
Thank you William, I am seriously considering learning Python. In any case, it looks like that I need to be versatile with Python to use Sage well. On Jun 15, 11:39 am, William Stein wst...@gmail.com wrote: On Mon, Jun 15, 2009 at 5:03 PM, lenient7lenie...@gmail.com wrote: Hello everyone, I am very new to the sage. I tried to use the sage from a remote client. On that regard, I am running the Sage 4.0.1 on OpenSUSE 11.1 64bit edition. However when I am trying to run notebook with 'secure=True' option, it gives errors which looks like coming from notebook.setup(). It's completely broken. This is a new bug in Sage-4.0, which was introduced by factoring dsage out from the core sage library, I think by Mike Hansen. I've opened a blocker ticket for this: http://trac.sagemath.org/sage_trac/ticket/6299 I hope Mike will fix this, or if not him, then somebody. It shouldn't be hard. In the meantime, you'll unfortunately have to wait a little, or try to fix the problem yourself. The fix is probably just to stick some import statement somewhere obvious. Following lines are from when I trying this process with freshly installed sage. Any idea or hint will be highly appreciated! lenie...@lenient7:~/bin/sage-4.0.1 ./ sage -- | Sage Version 4.0.1, Release Date: 2009-06-06 | | Type notebook() for the GUI, and license() for information. | -- The SAGE install tree may have moved. Regenerating Python.pyo and .pyc files that hardcode the install PATH (please wait at most a few minutes)... Do not interrupt this. sage: notebook.setup() Using dsage certificates. --- NameError Traceback (most recent call last) /home/lenient7/bin/sage-4.0.1/ipython console in module() /home/lenient7/bin/sage-4.0.1/local/lib/python2.5/site-packages/sage/ server/notebook/run_notebook.py in notebook_setup(self) 39 print Using dsage certificates. 40 dsage = os.path.join(DOT_SAGE, 'dsage') --- 41 sage.dsage.all.dsage.setup () 42 shutil.copyfile(dsage + '/cacert.pem', private_pem) 43 shutil.copyfile(dsage + '/pubcert.pem', public_pem) NameError: global name 'sage' is not defined -- William Stein Associate Professor of Mathematics University of Washingtonhttp://wstein.org --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: notebook.setup() problem
On Mon, Jun 15, 2009 at 6:48 PM, lenient7lenie...@gmail.com wrote: Thank you William, I am seriously considering learning Python. In any case, it looks like that I need to be versatile with Python to use Sage well. Check out this awesome free book: http://www.diveintopython.org/ My favorite non-free Python book is: http://www.amazon.com/Python-Nutshell-Alex-Martelli/dp/0596001886 On Jun 15, 11:39 am, William Stein wst...@gmail.com wrote: On Mon, Jun 15, 2009 at 5:03 PM, lenient7lenie...@gmail.com wrote: Hello everyone, I am very new to the sage. I tried to use the sage from a remote client. On that regard, I am running the Sage 4.0.1 on OpenSUSE 11.1 64bit edition. However when I am trying to run notebook with 'secure=True' option, it gives errors which looks like coming from notebook.setup(). It's completely broken. This is a new bug in Sage-4.0, which was introduced by factoring dsage out from the core sage library, I think by Mike Hansen. I've opened a blocker ticket for this: http://trac.sagemath.org/sage_trac/ticket/6299 I hope Mike will fix this, or if not him, then somebody. It shouldn't be hard. In the meantime, you'll unfortunately have to wait a little, or try to fix the problem yourself. The fix is probably just to stick some import statement somewhere obvious. Following lines are from when I trying this process with freshly installed sage. Any idea or hint will be highly appreciated! lenie...@lenient7:~/bin/sage-4.0.1 ./ sage -- | Sage Version 4.0.1, Release Date: 2009-06-06 | | Type notebook() for the GUI, and license() for information. | -- The SAGE install tree may have moved. Regenerating Python.pyo and .pyc files that hardcode the install PATH (please wait at most a few minutes)... Do not interrupt this. sage: notebook.setup() Using dsage certificates. --- NameError Traceback (most recent call last) /home/lenient7/bin/sage-4.0.1/ipython console in module() /home/lenient7/bin/sage-4.0.1/local/lib/python2.5/site-packages/sage/ server/notebook/run_notebook.py in notebook_setup(self) 39 print Using dsage certificates. 40 dsage = os.path.join(DOT_SAGE, 'dsage') --- 41 sage.dsage.all.dsage.setup () 42 shutil.copyfile(dsage + '/cacert.pem', private_pem) 43 shutil.copyfile(dsage + '/pubcert.pem', public_pem) NameError: global name 'sage' is not defined -- William Stein Associate Professor of Mathematics University of Washingtonhttp://wstein.org -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Mac OS X 10.4 32bit G4 Support
On 12 Jun., 08:55, paramaniac luka...@student.ethz.ch wrote: After 9 hours of hard work, my brave PowerBook G4 800MHz 1GB managed Well, imagine how hard my brave PowerBook G4 550 MHz 768MB has to work ... and it did build all the Sage OS X 10.4 PPC G4 versions from 3.4 on. This also explains why these builds are usually a bit behind the others. to compile Sage 4.0.1 :-) The result can be found here:http://n.ethz.ch/student/lukasre/download/ The process was much easier than I thought. Interestingly, Sage became Hey, thanks for the effort! Sage is a community project, after all! much bigger (1.5GB) and 680MB compressed. Normally, in a bdist all the .../spkg/standard/*.spkg files are replaced by placeholder files, to save space. Now I have a question for the next release of Sage: Are there any specific export commands to optimize the build for a ppc7450 machine? Not that I knew of --- Atlas, gmp-mpir, and some other packages seem however to recognize the CPU quite good, and optimize accordingly. IIRC, there once was an isue with a Sage PPC version built on a Mac with a PPC G5 CPU, and the optimizations performed prevented Sage to run on G3/G4 Macs. Regards, Lukas Cheers, gsw --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Dimensional Analysis or Unit Conversion capability?
On Jun 15, 4:24 am, Maurizio maurizio.gran...@gmail.com wrote: precisely, basic units (as meter, second, etc) are, by definition, terminal unums (without references); derived units (as Newton, Joule, etc) have a dictionary with, as keys, unums representing basic/derived units, and, as values, their exponents; finally, any quantity may be derived with the same idea. Well, I think this is an example of an operation (and it's pretty important to the unit conversion stuff) that could be simplified quite a bit by exploiting Sage's capabilities instead of trying to bolt on an existing package. If you had a list of equations of derived units in terms of basic units, you could immediately compute a conversion factor for two derived units. So the question is how to get such a list. Unit conversions are conveniently expressed by equations like foo = bar^m * baz^n. Any such equation defines a derived unit; basic units or other derived units might appear on the right. To get conversions to base units, just solve all the equations for all the derived units. (It's convenient to take logarithms so the equations are linear.) Then you have every derived unit expressed in terms of basic units only. When new conversions are defined, just append the new equations and solve it again. Symbolic operations (representing equations, solving equations, log and exp, substitution or evaluation) make that construction very simple. The whole business with building a hash table or a graph or whatever is just a workaround for the lack of symbolic operations. best Robert Dodier --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Notebook upload/download problems
Since version 3.4 or so I haven't been able to either upload worksheets to my Sage notebook nor download from the notebook to a file on my computer. This problem is independent of default web browser, and exists equally on both my Mac G4 Powerbook and intel Macbook. * (1) When trying to download a worksheet from notebook: I get a new browser page titled Internal Server Error with this message: Internal Server Error An error occurred rendering the requested page. More information is available in the server log. The server log looks like this: 2009-06-15 11:16:14-0700 [HTTPChannel,8,127.0.0.1] cd sage_notebook/ worksheets/admin/ tar -jcf /Users/shapiro/.sage/temp/ PowerBook_2.local/1373/tmp_0.sws 0 sh: line 1: /sw/bin/tar: cannot execute binary file 2009-06-15 11:16:14-0700 [HTTPChannel,8,127.0.0.1] Failed to execute command to export worksheet: ... exceptions.IOError: [Errno 2] No such file or directory: '/Users/ shapiro/.sage//temp/PowerBook_2.local/1373//tmp_0.sws' * (2) When attempting to upload a file (in this case: beezer- linear.sws) to notebook from my computer, I get a new browser page that is blank, with title Error| Sage Notebook, and the following server log message: 2009-06-15 11:22:00-0700 [-] cd /Users/shapiro/.sage/temp/ PowerBook_2.local/1611/dir_1; tar -jxf /Users/shapiro/.sage/temp/ PowerBook_2.local/1611/dir_0/beezer-linear.sws sh: line 1: /sw/bin/tar: cannot execute binary file Any help on this matter would be greatly appreciated --- JoelS --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: notebook.setup() problem
On Mon, Jun 15, 2009 at 9:59 AM, William Steinwst...@gmail.com wrote: It's completely broken. This is a new bug in Sage-4.0, which was introduced by factoring dsage out from the core sage library, I think by Mike Hansen. I've opened a blocker ticket for this: http://trac.sagemath.org/sage_trac/ticket/6299 I hope Mike will fix this, or if not him, then somebody. It shouldn't be hard. In the meantime, you'll unfortunately have to wait a little, or try to fix the problem yourself. The fix is probably just to stick some import statement somewhere obvious. Patch is up at http://trac.sagemath.org/sage_trac/ticket/6299. --Mike --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Dimensional Analysis or Unit Conversion capability?
Very interesting... so how would be the best way to do this with symbolics in SAGE? I think the recent switch to pynac requires the community some time to learn how to use it. Nonetheless, I sent an email to the author of Unum, so he could at least point out some suggestions, if not directly help to, write some code taking advantage of SAGE capabilities, which he may really benefit. Thanks for the comment Regards Maurizio On 15 Giu, 20:30, Robert Dodier robert.dod...@gmail.com wrote: On Jun 15, 4:24 am, Maurizio maurizio.gran...@gmail.com wrote: precisely, basic units (as meter, second, etc) are, by definition, terminal unums (without references); derived units (as Newton, Joule, etc) have a dictionary with, as keys, unums representing basic/derived units, and, as values, their exponents; finally, any quantity may be derived with the same idea. Well, I think this is an example of an operation (and it's pretty important to the unit conversion stuff) that could be simplified quite a bit by exploiting Sage's capabilities instead of trying to bolt on an existing package. If you had a list of equations of derived units in terms of basic units, you could immediately compute a conversion factor for two derived units. So the question is how to get such a list. Unit conversions are conveniently expressed by equations like foo = bar^m * baz^n. Any such equation defines a derived unit; basic units or other derived units might appear on the right. To get conversions to base units, just solve all the equations for all the derived units. (It's convenient to take logarithms so the equations are linear.) Then you have every derived unit expressed in terms of basic units only. When new conversions are defined, just append the new equations and solve it again. Symbolic operations (representing equations, solving equations, log and exp, substitution or evaluation) make that construction very simple. The whole business with building a hash table or a graph or whatever is just a workaround for the lack of symbolic operations. best Robert Dodier --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Posting in sage-windows
On Jun 15, 9:32 am, Craig Citro craigci...@gmail.com wrote: My apologies for posting about the sage-windows group within the sage- support group but I posted 3 messages (two replies and a new topic) into sage-windows a couple of weeks back and they're still not showing up in the message lists. And I wasn't sure how else to ask for help in posting there. I'm listed as a member of that group and did get an email notification that some messages had been posted. So do I need to do anything special to post there perhaps? That was my mistake. I'm really sorry for your message not getting posted promptly. It should in the future. And just for the record -- when the behavior on one of the other groups is funky, emailing sage-support isn't a bad idea at all. :) (In this case, it was exactly the right move to fix the problem ... and now several of us can approve messages on sage-windows, meaning it shoudn't happen again.) All sounds good. Many thanks Kevin --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] factor
Is there anyway to get the factor function to factor an expression without using QQ['x'].0? I want just integer factors. I have created a Twisted server using Sage to do calculations from a form. When I put QQ['x'].0 into the sage script I get a systax on the period. It does work from the command line. Thanx --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: drawing graphs
On Jun 15, 10:38 am, William Stein wst...@gmail.com wrote:
On Mon, Jun 15, 2009 at 12:55 PM, Dominique
Manchonmanc...@math.univ-bpclermont.fr wrote:
Hello!
I'm a newcomer into Sage and Python. When I want to draw some
graphical representation of graphs I get problems
Despite years of work, drawing graphs in Sage is still pretty broken.
Graph drawing works well enough for me, when I just want a quick
idea of what's going on. If I need a well drawn graph, I just export
to Graphviz. Graphviz is open source but I seem to recall that its
license is not Sage compatible. It is, nonetheless, freely available.
Here, for example, is the Cayley graph of the alternating group A5:
A = AlternatingGroup(5)
G = Graph(A.cayley_graph())
s = G.graphviz_string()
f = open('graphfile.dot', 'w')
f.write(s)
f.close()
If you now open graphfile.dot in Graphviz, you should get a
an interpretable version of quite a complicated graph.
Mark McClure
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-~--~~~~--~~--~--~---
[sage-support] Re: drawing graphs
On Tue, Jun 16, 2009 at 12:27 AM, mark mccluremcmcc...@unca.edu wrote:
On Jun 15, 10:38 am, William Stein wst...@gmail.com wrote:
On Mon, Jun 15, 2009 at 12:55 PM, Dominique
Manchonmanc...@math.univ-bpclermont.fr wrote:
Hello!
I'm a newcomer into Sage and Python. When I want to draw some
graphical representation of graphs I get problems
Despite years of work, drawing graphs in Sage is still pretty broken.
Graph drawing works well enough for me, when I just want a quick
idea of what's going on. If I need a well drawn graph, I just export
to Graphviz. Graphviz is open source but I seem to recall that its
license is not Sage compatible. It is, nonetheless, freely available.
True, but I will be happier when Sage's graph drawing is at least as
good as Graphviz's.
Who amongst you is up to the challenge?
Here, for example, is the Cayley graph of the alternating group A5:
A = AlternatingGroup(5)
G = Graph(A.cayley_graph())
s = G.graphviz_string()
f = open('graphfile.dot', 'w')
f.write(s)
f.close()
If you now open graphfile.dot in Graphviz, you should get a
an interpretable version of quite a complicated graph.
University of Washington
http://wstein.org
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[sage-support] Re: factor
On Mon, Jun 15, 2009 at 10:54 PM, Mikiethephantom6...@hotmail.com wrote: Is there anyway to get the factor function to factor an expression without using QQ['x'].0? I want just integer factors. I don't understand what you mean by integer factors? Can you give an example? I have created a Twisted server using Sage to do calculations from a form. When I put QQ['x'].0 into the sage script I get a systax on the period. It does work from the command line. Thanx -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Notebook upload/download problems
On Mon, Jun 15, 2009 at 8:35 PM, JoelSjoels...@gmail.com wrote: Since version 3.4 or so I haven't been able to either upload worksheets to my Sage notebook nor download from the notebook to a file on my computer. This problem is independent of default web browser, and exists equally on both my Mac G4 Powerbook and intel Macbook. * (1) When trying to download a worksheet from notebook: I get a new browser page titled Internal Server Error with this message: Internal Server Error An error occurred rendering the requested page. More information is available in the server log. The server log looks like this: 2009-06-15 11:16:14-0700 [HTTPChannel,8,127.0.0.1] cd sage_notebook/ worksheets/admin/ tar -jcf /Users/shapiro/.sage/temp/ PowerBook_2.local/1373/tmp_0.sws 0 sh: line 1: /sw/bin/tar: cannot execute binary file It looks like you have some broken version if fink installed on your computer. Try moving /sw out of the way temporarily. 2009-06-15 11:16:14-0700 [HTTPChannel,8,127.0.0.1] Failed to execute command to export worksheet: ... exceptions.IOError: [Errno 2] No such file or directory: '/Users/ shapiro/.sage//temp/PowerBook_2.local/1373//tmp_0.sws' * (2) When attempting to upload a file (in this case: beezer- linear.sws) to notebook from my computer, I get a new browser page that is blank, with title Error| Sage Notebook, and the following server log message: 2009-06-15 11:22:00-0700 [-] cd /Users/shapiro/.sage/temp/ PowerBook_2.local/1611/dir_1; tar -jxf /Users/shapiro/.sage/temp/ PowerBook_2.local/1611/dir_0/beezer-linear.sws sh: line 1: /sw/bin/tar: cannot execute binary file Any help on this matter would be greatly appreciated --- JoelS -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Notebook upload/download problems
Thanks William. That did the trick! ... JoelS On Jun 15, 3:58 pm, William Stein wst...@gmail.com wrote: On Mon, Jun 15, 2009 at 8:35 PM, JoelSjoels...@gmail.com wrote: Since version 3.4 or so I haven't been able to either upload worksheets to my Sage notebook nor download from the notebook to a file on my computer. This problem is independent of default web browser, and exists equally on both my Mac G4 Powerbook and intel Macbook. * (1) When trying to download a worksheet from notebook: I get a new browser page titled Internal Server Error with this message: Internal Server Error An error occurred rendering the requested page. More information is available in the server log. The server log looks like this: 2009-06-15 11:16:14-0700 [HTTPChannel,8,127.0.0.1] cd sage_notebook/ worksheets/admin/ tar -jcf /Users/shapiro/.sage/temp/ PowerBook_2.local/1373/tmp_0.sws 0 sh: line 1: /sw/bin/tar: cannot execute binary file It looks like you have some broken version if fink installed on your computer. Try moving /sw out of the way temporarily. 2009-06-15 11:16:14-0700 [HTTPChannel,8,127.0.0.1] Failed to execute command to export worksheet: ... exceptions.IOError: [Errno 2] No such file or directory: '/Users/ shapiro/.sage//temp/PowerBook_2.local/1373//tmp_0.sws' * (2) When attempting to upload a file (in this case: beezer- linear.sws) to notebook from my computer, I get a new browser page that is blank, with title Error| Sage Notebook, and the following server log message: 2009-06-15 11:22:00-0700 [-] cd /Users/shapiro/.sage/temp/ PowerBook_2.local/1611/dir_1; tar -jxf /Users/shapiro/.sage/temp/ PowerBook_2.local/1611/dir_0/beezer-linear.sws sh: line 1: /sw/bin/tar: cannot execute binary file Any help on this matter would be greatly appreciated --- JoelS -- William Stein Associate Professor of Mathematics University of Washingtonhttp://wstein.org --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
