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 (direc
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):
> g.complement().line_graph().comple
e about Jmol will
> hopefully reply with more 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 wrote:
>
>
>
> > I'm running OS 10.6.2 a Mac airbook. I had pro
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 an
009 at 8:25 PM, Chris Godsil 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 wstei
Thanks. I tried that but the problem remains.
Chris
On Sep 18, 11:07 pm, William Stein wrote:
> On Fri, Sep 18, 2009 at 8:05 PM, Chris Godsil wrote:
>
> > I'm running Mac OS X 10.6.1. The command matrix.eigenvalues() has
> > stopped working, as follows:
>
> Y
l/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 G
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 wrote:
> I want to compute determinants of matrix polynomials, for matrices up
> to 20 x 20, say.
> The attached transcript
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
.
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. = QuaternionAlgebra(QQ,-1,-1);
>
> > an
I want to extract the "real part" of a quaternion, i.e., if
L. = 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 quaternio
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