[sage-support] Re: Plots using R in sage notebook appear later
And then there's Jason's beautiful little time-saving method if you use a lot of graphics: *from contextlib import contextmanager @contextmanager def r_graphics(r): r.png() yield r.dev_off() with r_graphics(r): r.boxplot() r.some_other_plot()* This and further discussion can be found at: http://trac.sagemath.org/sage_trac/ticket/11266 Joal Heagney -- 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 URL: http://www.sagemath.org
[sage-support] Import Ellipse module?
Do I need to download/load something before I can import the ellipse module? When I type from sage.plot.ellipse import Ellipse I get ImportError: No module named ellipse Thanks! -- 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 URL: http://www.sagemath.org
Re: [sage-support] Error: Converting from p-adics to rationals.
On Wed, May 25, 2011 at 5:53 PM, Mel chemmyg...@gmail.com wrote: I'm having an issue with converting between p-adic and rational numbers. Specifically, there are certain p-adic numbers that I cannot convert to rationals. As an example, if 1+7^3+O(7^5) is a 7-adic integer with capped relative precision 5, I cannot convert it to a rational. I get the error ValueError: Rational reconstruction of 344 (mod 16807) does not exist. When asking such questions, it is helpful to give code that can trivially pasted in that illustrates your problem. More generally, it seems that if the precision of the p-adic number is O(p^n), and the p-adic number includes powers of p greater than n/2, the number cannot be converted to a rational. Any info is appreciated. Thanks! -- 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 URL: http://www.sagemath.org -- William Stein 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 URL: http://www.sagemath.org
[sage-support] Re: How use alternative authentication for notebook server?.(i.e. integrate with other web app?)..
Jason Thanks. Let me ask a related question. If you do not do authentication, then does every student just go to their own personal URL to access their notebook? What is that URL? In other words, I may be able to do what I want with URL magic. cs On May 26, 12:53 am, Jason Grout jason-s...@creativetrax.com wrote: On 5/26/11 12:35 AM, Chris Seberino wrote: My students authenticate themselves by signing into a classroom web app unrelated to Sage. Possible to integrate Sage notebook server with this classroom web app so students DO NOT have to authenticate a SECOND TIME with Sage login page? It depends on what webapp you are talking about. There is work to make the notebook work with OpenID, and there has been work before to make the notebook work with LDAP. The OpenID work is nearly complete and will probably be merged into Sage sometime this summer. Jason -- 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 URL: http://www.sagemath.org
[sage-support] Not rebooting notebook server constantly leaves too many notebooks active?
Suppose different students sign into the same Sage server at different times. Won't that cause EVERY STUDENT's notebook to be in memory bogging down the server? I've been rebooting but maybe the smartest thing is to either... 1. Make students sign out? (Some will forget!!) 2. Autokill after 1 hour of inactivity? cs -- 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 URL: http://www.sagemath.org
[sage-support] Re: Not rebooting notebook server constantly leaves too many notebooks active?
On 5/26/11 12:19 PM, Chris Seberino wrote: Suppose different students sign into the same Sage server at different times. Won't that cause EVERY STUDENT's notebook to be in memory bogging down the server? I've been rebooting but maybe the smartest thing is to either... 1. Make students sign out? (Some will forget!!) 2. Autokill after 1 hour of inactivity? You can set a timeout that autokills worksheets after a certain period of time. See the notebook command help: notebook? Jason -- 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 URL: http://www.sagemath.org
[sage-support] Re: How use alternative authentication for notebook server?.(i.e. integrate with other web app?)..
On 5/26/11 12:15 PM, Chris Seberino wrote: Jason Thanks. Let me ask a related question. If you do not do authentication, then does every student just go to their own personal URL to access their notebook? What is that URL? They need to log in to access their worksheets; there are session cookies that are set, for example. If you try to go to the url representing a private worksheet without logging in, the system won't let you see the worksheet. Jason -- 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 URL: http://www.sagemath.org
Re: [sage-support] Re: imposing commutation relation
On Wed, May 25, 2011 at 11:55 AM, Simon King simon.k...@uni-jena.de wrote:
Hi Rajeev,
On 25 Mai, 06:14, Rajeev Singh rajs2...@gmail.com wrote:
sage: R.a,b = FreeAlgebra(QQ, 2)
sage: p = a*(a+2*b)
sage: list(p)
[(2, a*b), (1, a^2)]
is there a simple way to reverse this last step?
I thought that for many parents R holds that R(list(p))==p, but
apparently I was mistaken.
However, for example, in the case of polynomials, one has
sage: P.x,y = QQ[]
sage: p = P.random_element()
sage: p
x*y + 5*y^2 - x + 1
sage: p.dict()
{(1, 0): -1, (0, 0): 1, (1, 1): 1, (0, 2): 5}
sage: P(p.dict()) == p
True
But apparently that does not hold for free algebras. Here is a work-
around using the 'add' function:
sage: R.a,b = FreeAlgebra(QQ, 2)
sage: p = a*(a+2*b)
sage: L = list(p)
sage: add([c*R(m) for c,m in L], R(0))
a^2 + 2*a*b
Cheers,
Simon
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Thanks Simon,
One small querry -
sage: R.a,b = FreeAlgebra(QQ, 2)
sage: p = a*(a+2*b)
sage: p
a^2 + 2*a*b
sage: list(p)
[(2, a*b), (1, a^2)]
Why is the order of terms in the list not the same that in string of p (a^2
in string appears before a*b and the opposite happens for the list) ? What
can I do to make them in same order?
Rajeev
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[sage-support] Re: imposing commutation relation
Hi Rajeev, On 26 Mai, 20:08, Rajeev Singh rajs2...@gmail.com wrote: Why is the order of terms in the list not the same that in string of p (a^2 in string appears before a*b and the opposite happens for the list) ? What can I do to make them in same order? One can sort lists in Python (see the Python docs), and one can also state how the list elements shall be sorted. Here, the list elements are pairs (coefficient,monomial), and we want to sort so that the monomials increase, whereas the coefficients do not matter. Hence, you can do: sage: p^3 a^6 + 2*a^5*b + 2*a^3*b*a^2 + 4*a^3*b*a*b + 2*a*b*a^4 + 4*a*b*a^3*b + 4*a*b*a*b*a^2 + 8*a*b*a*b*a*b sage: L = list(p^3); L # that's not ordered how you want it [(1, a^6), (2, a^5*b), (2, a^3*b*a^2), (4, a*b*a*b*a^2), (4, a*b*a^3*b), (2, a*b*a^4), (8, a*b*a*b*a*b), (4, a^3*b*a*b)] sage: L.sort(cmp=lambda x,y:cmp(x[1],y[1])) # sort by the monomials sage: L [(1, a^6), (2, a^5*b), (2, a^3*b*a^2), (4, a^3*b*a*b), (2, a*b*a^4), (4, a*b*a^3*b), (4, a*b*a*b*a^2), (8, a*b*a*b*a*b)] Remark: If you do sage: p._repr_??hit return after ?? then you see how printing p is implemented. Cheers, Simon -- 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 URL: http://www.sagemath.org
[sage-support] error installing Kash
Hi, I'm having trouble installing the optional kash package with sage-4.7. I'm using a recent issue macbook pro running 10.6.7. Any help would be appreciated. Here is what happens: $ sage -i kash3-2008-07-31.spkg Installing kash3-2008-07-31.spkg Calling sage-spkg on kash3-2008-07-31.spkg Warning: Attempted to overwrite SAGE_ROOT environment variable kash3-2008-07-31 Machine: Darwin dhcp-141-198.caltech.edu 10.7.4 Darwin Kernel Version 10.7.4: Mon Apr 18 21:24:17 PDT 2011; root:xnu-1504.14.12~3/RELEASE_X86_64 x86_64 Deleting directories from past builds of previous/current versions of kash3-2008-07-31 Extracting package /Users/jtyard/sage-4.7/spkg/optional/ kash3-2008-07-31.spkg ... -rw-r--r-- 1 jtyard staff 34877440 May 26 17:35 /Users/jtyard/ sage-4.7/spkg/optional/kash3-2008-07-31.spkg Finished extraction Host system uname -a: Darwin dhcp-141-198.caltech.edu 10.7.4 Darwin Kernel Version 10.7.4: Mon Apr 18 21:24:17 PDT 2011; root:xnu-1504.14.12~3/RELEASE_X86_64 x86_64 CC Version gcc -v Using built-in specs. Target: i686-apple-darwin10 Configured with: /var/tmp/gcc/gcc-5666.3~6/src/configure --disable- checking --enable-werror --prefix=/usr --mandir=/share/man --enable- languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/ $/-4.2/ --with-slibdir=/usr/lib --build=i686-apple-darwin10 --program- prefix=i686-apple-darwin10- --host=x86_64-apple-darwin10 --target=i686- apple-darwin10 --with-gxx-include-dir=/include/c++/4.2.1 Thread model: posix gcc version 4.2.1 (Apple Inc. build 5666) (dot 3) Usage: List:tar -tf archive-filename Extract: tar -xf archive-filename Create: tar -cf archive-filename [filenames...] Help:tar --help Error extracting kash. real0m0.031s user0m0.024s sys 0m0.007s sage: An error occurred while installing kash3-2008-07-31 Please email sage-devel http://groups.google.com/group/sage-devel explaining the problem and send the relevant part of of /Users/jtyard/sage-4.7/install.log. Describe your computer, operating system, etc. If you want to try to fix the problem yourself, *don't* just cd to /Users/jtyard/sage-4.7/spkg/build/kash3-2008-07-31 and type 'make check' or whatever is appropriate. Instead, the following commands setup all environment variables correctly and load a subshell for you to debug the error: (cd '/Users/jtyard/sage-4.7/spkg/build/kash3-2008-07-31' '/Users/ jtyard/sage-4.7/sage' -sh) When you are done debugging, you can type exit to leave the subshell. -- 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 URL: http://www.sagemath.org
[sage-support] Re: error installing Kash
On Thursday, May 26, 2011 5:41:24 PM UTC-7, jtyard wrote: Hi, I'm having trouble installing the optional kash package with sage-4.7. I'm using a recent issue macbook pro running 10.6.7. Any help would be appreciated. It certainly looks like that spkg is broken. In fact, this was reported as a bug almost a year ago, but no one has fixed it. See http://trac.sagemath.org/sage_trac/ticket/9333. I'll try to post a link to a new spkg soon. Meanwhile, to fix it yourself: find the file kash3-2008-07-31.spkg, and from the terminal, run $ tar jxf kash3-2008-07-31.spkg This will create a directory kash3-2008-07-31. In that directory, edit the file spkg-install. There is a line that says something like bunzip2 -c src/$PKG.tar.bz2 | tar fixmv - and it should really say bunzip2 -c src/$PKG.tar.bz2 | tar jxf - (Just the end is different, the characters after tar.) Save the file, cd to the parent directory (the directory containing kash3-2008-07-31 as a subdirectory), and execute $ sage -spkg kash3-2008-07-31 This will create a new file kash3-spkg, and then if you $ sage -k kash3-2008-07-31.spkg it should install. Good luck. -- John -- 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 URL: http://www.sagemath.org
