[sage-support] Groebner bases error?
Hi: I'm wondering if the following possible error (in 2.10.3.rc0) is already known, or if I'm just doing something stupid: sage: R.a,b,c,d = PolynomialRing(QQ, 4) sage: I = ideal(b^2-a*c, c^2-b*d, a*d-b*c) sage: F = I.groebner_fan(); F Groebner fan of the ideal: Ideal (b^2 - a*c, c^2 - b*d, -b*c + a*d) of Multivariate Polynomial Ring in a, b, c, d over Rational Field sage: F.reduced_groebner_bases() File string, line 1 Ideal (b**2 - a*c, c**2 - b*d, -b*c + a*d) of Multivariate Polynomial Ring in a, b, c, d over Rational Field ^ type 'exceptions.SyntaxError': invalid syntax sage: F.fvector() File string, line 1 Ideal (b**2 - a*c, c**2 - b*d, -b*c + a*d) of Multivariate Polynomial Ring in a, b, c, d over Rational Field ^ type 'exceptions.SyntaxError': invalid syntax If this is indeed an error, should I make a new trac ticket or has it already been reported? - David Joyner --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@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-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Groebner bases error?
On Mon, Mar 3, 2008 at 12:18 PM, David Joyner [EMAIL PROTECTED] wrote: Hi David, Hi: I'm wondering if the following possible error (in 2.10.3.rc0) is already known, or if I'm just doing something stupid: it is already known, but not fixed as far as I know. There is no track ticket yet, but as rc1 will be out in a couple hours I will open tickets for all known failures. sage: R.a,b,c,d = PolynomialRing(QQ, 4) sage: I = ideal(b^2-a*c, c^2-b*d, a*d-b*c) sage: F = I.groebner_fan(); F Groebner fan of the ideal: Ideal (b^2 - a*c, c^2 - b*d, -b*c + a*d) of Multivariate Polynomial Ring in a, b, c, d over Rational Field sage: F.reduced_groebner_bases() File string, line 1 Ideal (b**2 - a*c, c**2 - b*d, -b*c + a*d) of Multivariate Polynomial Ring in a, b, c, d over Rational Field ^ type 'exceptions.SyntaxError': invalid syntax sage: F.fvector() File string, line 1 Ideal (b**2 - a*c, c**2 - b*d, -b*c + a*d) of Multivariate Polynomial Ring in a, b, c, d over Rational Field ^ type 'exceptions.SyntaxError': invalid syntax If this is indeed an error, should I make a new trac ticket or has it already been reported? Nope, I will take care of the tickets shortly. - David Joyner Cheers, Michael --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@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-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] VMware image to use IDE disk type
Current 2.10.2 VMware image seems to have SCSI virtual disk type. This causes problems with other VM software, such as VirtualBox that supports only IDE images. As it doesn't really matter which drive type is used in VM, a little change in VMware images to use IDE allows to expose these images to a greater base of users. --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@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-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: VMware image to use IDE disk type
On Mon, Mar 3, 2008 at 8:48 AM, anatoly techtonik [EMAIL PROTECTED] wrote: Current 2.10.2 VMware image seems to have SCSI virtual disk type. This causes problems with other VM software, such as VirtualBox that supports only IDE images. As it doesn't really matter which drive type is used in VM, a little change in VMware images to use IDE allows to expose these images to a greater base of users. Could you create an IDE version of the VMware image? -- William --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@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-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: sage installation Ubuntu 7.10 - extracting .tar error
On Mon, Mar 3, 2008 at 1:01 PM, Chris S. [EMAIL PROTECTED] wrote: I am trying to install sage 2.10.2 on Ubuntu 7.10. I have tried both installation from a precompiled binary and from source. Each led to an error (below). I also tried installing sage 2.10.1 from source which had the same error as version 2.10.2: First, installing a precompiled binary: [EMAIL PROTECTED]:~$ tar zxvf /media/hda2/sage-2.10.2-linux-32bit-ubuntu-i686- Linux.tar.gz (lots of output) ... sage-2.10.2-linux-32bit-ubuntu-i686-Linux/local/lib/libz.so sage-2.10.2-linux-32bit-ubuntu-i686-Linux/local/lib/libm4ri.so sage-2.10.2-linux-32bit-ubuntu-i686-Linux/local/lib/libntl.so tar: Skipping to next header gzip: stdin: invalid compressed data--crc error gzip: stdin: invalid compressed data--length error tar: Child returned status 1 tar: Error exit delayed from previous errors This means that your download was corrupted. A prerequisite for installing Sage is that you can download files without them being corrupted. -- William // at this point I renamed the directory to Sage [EMAIL PROTECTED]:~$ cd Sage [EMAIL PROTECTED]:~/Sage$ ./sage -- | SAGE Version 2.10.2, Release Date: 2008-02-22 | | Type notebook() for the GUI, and license() for information.| -- Could not find platform independent libraries prefix Could not find platform dependent libraries exec_prefix Consider setting $PYTHONHOME to prefix[:exec_prefix] 'import site' failed; use -v for traceback Traceback (most recent call last): File /home/a/Sage/local/bin/sage-location, line 3, in module import os ImportError: No module named os Could not find platform independent libraries prefix Could not find platform dependent libraries exec_prefix Consider setting $PYTHONHOME to prefix[:exec_prefix] 'import site' failed; use -v for traceback Traceback (most recent call last): File /home/a/Sage/local/bin/sage-cleaner, line 21, in module import os, shutil, sys, time, socket ImportError: No module named os Could not find platform independent libraries prefix Could not find platform dependent libraries exec_prefix Consider setting $PYTHONHOME to prefix[:exec_prefix] 'import site' failed; use -v for traceback Traceback (most recent call last): File /home/a/Sage/local/bin/sage-ipython, line 10, in module import IPython ImportError: No module named IPython __ Next I tried installing from source, first downloading the source code then extracting the tar file: [EMAIL PROTECTED]:~$ tar xvf /media/hda2/sage-2.10.2.tar sage-2.10.2/ sage-2.10.2/makefile sage-2.10.2/COPYING.txt sage-2.10.2/HISTORY.txt sage-2.10.2/README.txt sage-2.10.2/sage-README-osx.txt sage-2.10.2/example.sage sage-2.10.2/sage sage-2.10.2/spkg/ sage-2.10.2/spkg/standard/ sage-2.10.2/spkg/standard/README.txt sage-2.10.2/spkg/standard/deps sage-2.10.2/spkg/standard/libdist_filelist sage-2.10.2/spkg/standard/newest_version sage-2.10.2/spkg/standard/atlas-3.8.p11.spkg sage-2.10.2/spkg/standard/blas-20070724.spkg sage-2.10.2/spkg/standard/cddlib-094b.p1.spkg sage-2.10.2/spkg/standard/clisp-2.41.p12.spkg sage-2.10.2/spkg/standard/conway_polynomials-0.2.spkg sage-2.10.2/spkg/standard/cvxopt-0.9.p5.spkg sage-2.10.2/spkg/standard/cython-0.9.6.12.spkg sage-2.10.2/spkg/standard/doc-2.10.2.spkg tar: Skipping to next header tar: Error exit delayed from previous errors The same output occurred when extracting sage 2.10.1 -- 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 [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: sage installation Ubuntu 7.10 - extracting .tar error
On Mon, Mar 3, 2008 at 8:01 PM, Chris S. [EMAIL PROTECTED] wrote: gzip: stdin: invalid compressed data--crc error gzip: stdin: invalid compressed data--length error tar: Child returned status 1 tar: Error exit delayed from previous errors As William said, you didn't get the full file. If your connection is a bit flaky then wget is better than Firefox/IE/etc: $ wget -c http://sagemath.org/SAGEbin/linux/32bit/sage-2.10.2-linux-32bit-ubuntu-i686-Linux.tar.gz The -c means continue so you can stop and restart the download. Cheers, -- Carlo Hamalainen http://carlo-hamalainen.net --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@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-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Groebner bases error?
Isn't this the same problem as 2358? Same source probably. -M.Hampton On Mar 3, 6:04 am, Michael Abshoff [EMAIL PROTECTED] wrote: On Mon, Mar 3, 2008 at 12:18 PM, David Joyner [EMAIL PROTECTED] wrote: Hi David, Hi: I'm wondering if the following possible error (in 2.10.3.rc0) is already known, or if I'm just doing something stupid: it is already known, but not fixed as far as I know. There is no track ticket yet, but as rc1 will be out in a couple hours I will open tickets for all known failures. sage: R.a,b,c,d = PolynomialRing(QQ, 4) sage: I = ideal(b^2-a*c, c^2-b*d, a*d-b*c) sage: F = I.groebner_fan(); F Groebner fan of the ideal: Ideal (b^2 - a*c, c^2 - b*d, -b*c + a*d) of Multivariate Polynomial Ring in a, b, c, d over Rational Field sage: F.reduced_groebner_bases() File string, line 1 Ideal (b**2 - a*c, c**2 - b*d, -b*c + a*d) of Multivariate Polynomial Ring in a, b, c, d over Rational Field ^ type 'exceptions.SyntaxError': invalid syntax sage: F.fvector() File string, line 1 Ideal (b**2 - a*c, c**2 - b*d, -b*c + a*d) of Multivariate Polynomial Ring in a, b, c, d over Rational Field ^ type 'exceptions.SyntaxError': invalid syntax If this is indeed an error, should I make a new trac ticket or has it already been reported? Nope, I will take care of the tickets shortly. - David Joyner Cheers, Michael --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@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-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Groebner bases error?
On Mar 4, 1:12 am, Marshall Hampton [EMAIL PROTECTED] wrote: Isn't this the same problem as 2358? Same source probably. -M.Hampton Hi Marshall, it is either tightly related or the same issue. So far no one seems to have taken a serious stab at this [AFAIK]. Cheers, Michael --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@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-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Vector fields and Quivers
Hector Villafuerte wrote:
Hi,
I would like to plot the gradient (i.e. vector field) of functions
such as f(x,y) = exp(-(x^2 + y^2)); in this case:
grad(f(x,y)) = vector([ -2*x*exp(-(x^2 + y^2)), -2*y*exp(-(x^2 + y^2)) ])
Initially I tried with plot_vector_field, but as of now it just takes
two functions of one variable. For my second attempt I used
matplotlib, as indicated below (also, see attached plots).
So my question: is there a SAGEly way to plot this type of vector fields?
Thanks in advance!
There is now! It turned out to be a pretty simple fix to
plot_vector_field; see http://trac.sagemath.org/sage_trac/ticket/2381
Here's an example:
sage: x,y=var('x y')
sage: f(x,y) = exp(-(x^2+y^2))
sage: grad_f = [diff(f,var) for var in (x,y)]
sage: plot_vector_field(grad_f, (-2,2), (-2,2))
Thanks,
Jason
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