I would not be surprised it it was the finite field arithmetic that is
causing the difference.
On Friday, February 28, 2014 4:18:44 PM UTC-5, Aleksandr Kodess wrote:
As far as I know both sage and magma utilize Brendan McKay's program nauty
in order to check whether two given graphs
sage: k4=graphs.CompleteGraph(4)
sage: k4.complement().line_graph().complement()
complement(): Graph on 0 vertices
clique_number() is crashing on the empty graph,
On Saturday, December 1, 2012 9:30:27 AM UTC-5, Georgi Guninski wrote:
for g in graphs(4):
I'm running OS 10.6.2 a Mac airbook. I had problems with the binary
sage-4.3-osx10.6-intel-64bit-i386-Darwin.dmg, so I downloaded the
source and compiled it. I've found that show3d() does not work.
After the commands
sage: P = graphs.PetersenGraph()
sage: P.show3d()
I get the sage prompt
details, but in the meantime the tachyon
plotter should do at least some of what you want.
- kcrisman
On Dec 28, 10:53 am, Chris Godsil cgod...@uwaterloo.ca wrote:
I'm running OS 10.6.2 a Mac airbook. I had problems with the binary
sage-4.3-osx10.6-intel-64bit-i386-Darwin.dmg, so I
/sage/local/lib/python2.6/site-packages/sage/matrix/
matrix_integer_dense.so in
sage.matrix.matrix_integer_dense.Matrix_integer_dense._charpoly_linbox
(sage/matrix/matrix_integer_dense.c:11242)()
RuntimeError:
--
Thanks for any help
Chris Godsil
Thanks. I tried that but the problem remains.
Chris
On Sep 18, 11:07 pm, William Stein wst...@gmail.com wrote:
On Fri, Sep 18, 2009 at 8:05 PM, Chris Godsil cgod...@uwaterloo.ca wrote:
I'm running Mac OS X 10.6.1. The command matrix.eigenvalues() has
stopped working, as follows:
You
:
On Fri, Sep 18, 2009 at 8:25 PM, Chris Godsil cgod...@uwaterloo.ca wrote:
Thanks. I tried that but the problem remains.
One other thing to try would be to rebuild the sage--linbox
extension (which is easy). Just do the following from the root of your
Sage install:
flat:sage wstein$ touch devel
I want to compute determinants of matrix polynomials, for matrices up
to 20 x 20, say.
The attached transcript seems to indicate 9 or 10 might be my limit.
(Or it's late
and I am being stupd?)
--
| Sage Version 3.4, Release
suggests, I
entered
M.determinant? to see what algorithm was being used, but did not get
any useful information.
Thanks
Chris
On Mar 19, 4:17 am, Chris Godsil cgod...@uwaterloo.ca wrote:
I want to compute determinants of matrix polynomials, for matrices up
to 20 x 20, say.
The attached
I want to extract the real part of a quaternion, i.e., if
L.i,j,k = QuaternionAlgebra(QQ,-1,-1);
and a is in L, then I want the coefficient of 1 in the expansion of as
a linear
combination of 1, i, j and k.
Is there a way to do this? A graceful way?
(I have also discovered that using
.
Chris
On Mar 27, 6:19 pm, Justin Walker [EMAIL PROTECTED] wrote:
On Mar 27, 2008, at 12:58 PM, Chris Godsil wrote:
I want to extract the real part of a quaternion, i.e., if
L.i,j,k = QuaternionAlgebra(QQ,-1,-1);
and a is in L, then I want the coefficient of 1 in the expansion
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