Hi!
A partial reply to my own question:
On 2014-03-03, Simon King wrote:
> Doing the same in the pexpect interface, I get
> sage: gap.RequirePackage('"ModIsom"')
> Traceback (most recent call last):
> ...
> RuntimeError: Gap produced error output
> Error, Variable: 'WeightVector' is re
On Monday, March 3, 2014 4:20:22 PM UTC-5, Fred Gruber wrote:
>
> In the sage 6 notebook , if I type the following R code (in R mode)
> myfunc2<-function(x){
> print(x)
> if (x>1){
> print('x larger than 1')
> }
>
>
> where there is a missing bracket I do not get any errors from sage. It
We used something like this for a class once. You can follow which point is
transformed where
def vector_plotter(vec_list, points=False, **kwds):
pic = Graphics()
for c, v in zip(rainbow(len(vec_list), 'rgbtuple'), vec_list):
if points:
pic += point(v, rgbcolor=c, *
In the sage 6 notebook , if I type the following R code (in R mode)
myfunc2<-function(x){
print(x)
if (x>1){
print('x larger than 1')
}
where there is a missing bracket I do not get any errors from sage. It just
does not define the function myfunc2
This is very serious because if I have
Hi!
I thought that sage's pexpect interface to GAP just launches "sage -gap"
and then sends strings that are evaluated in the subprocess.
Hence, I am very surprised by the following.
I have installed GAP's ModIsom package, and in "sage -gap" I see that it
really is available:
gap> RequirePackag
AFAIK both implement the same basic algorithm. My guess is that nauty
quickly realizes that it has a huge problem and starts constructing graph
invariants in an attempt to answer it to the negative. If you were to
compare two graphs that are actually isomorphic I'm pretty sure that you
wouldn't
Once the graph is constructed, is_isomorphic throws away the vertex
labels and just works with pointers to ints. Constructing the graph
itself happens in a blink. Sadly, the bulk of the time is spent in
is_isomorphic.
The answer to Aleksandr's question is: Yes, this is a known issue --
nauty has
On 3/2/14, 9:52, martyall wrote:
I would like to plot the "effects" of an 2 by 2 matrix over the reals
on the unit sphere in the p-norm. By effects I mean I would like to
plot the unit sphere and it's image under a given matrix. In clearest
case when p=2 I found the following code from trac #9728
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
Reported as http://trac.sagemath.org/ticket/15886
Thanks for listening.
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On 2014-03-03 18:03, martin.vgag...@gmx.net wrote:
I guess now is a good time for the bug report
Absolutely, go for it!
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On Monday, March 3, 2014 5:31:18 PM UTC+1, martin@gmx.net wrote:
> Nevertheless, here is a minimal example:
>
> https://gist.githubusercontent.com/gagern/9320350/raw/d1896f7a5a05b24075098941c9c3ff156ca6c139/MinimalReprodcing6.sage
>
> It is minimal in the following sense: For the whole express
On Monday, March 3, 2014 11:30:50 AM UTC+1, Jeroen Demeyer wrote:
>
> > I have no clue what that error message means, and more importantly, how
> to avoid it.
> The concrete problem (I guess) is that 123633238138850861 is not a prime
> number. But now the question becomes: where does this number
I have been able to get ~1.7x with this somewhat ugly hack:
%cython
from sage.all import *
def permutationMatrices(n):
import numpy
cdef int deg = SymmetricGroup(n).degree()
cdef int i_max = SymmetricGroup(n).order()
cdef int chunk = 1
cdef int i = 0
step = range(0,i_ma
Hi all,
I'm trying to use Sage to implement the number field sieve factorization
algorithm, but I've reached a sticking point with defining polynomials and some
of their in built functions. I'm running Sage-5.13 through VirtualBox 4.3.8 and
homogenization does not work as expected. Following th
On 2014-03-03 09:11, martin.vgag...@gmx.net wrote:
As you can see in that file, I've encountered quite a number of places where
the current behavior of sage surprised or even annoyed me.
I think as a general rule, you should try to avoid symbolic computations
for any serious work. Try to conver
On 2014-03-03 09:11, martin.vgag...@gmx.net wrote:
sage.libs.pari.gen.PariError: ZZ_123633238138850861[y]/(y^2 +
114948053005503479*y + 71680486823734693) is not a field in FpX_ffintersect
I have no clue what that error message means, and more importantly, how to
avoid it.
The concrete problem
I'm trying to find a formula concerned with some computation about the relative
position of two ellipses. But some result along the way looks strange when
evaluated with RDF numbers, and trying to plug in algebaric numbers instead, I
encounter the following error message:
sage.libs.pari.gen.Par
Hi
I am using SAGE to interface with GAP. (I don't really know GAP, just playing
with the SAGE interface to it).
My problem is that I am trying to efficiently enumerate the group elements (and
get their matrix representations) of various permutation groups. Now, of
course this problem quickly
I would like to plot the "effects" of an 2 by 2 matrix over the reals on the
unit sphere in the p-norm. By effects I mean I would like to plot the unit
sphere and it's image under a given matrix. In clearest case when p=2 I found
the following code from trac #9728 which does exactly what I want.
Hi,
This might be more appropriate at the ask.sage site, but it is down at the
moment.
The problem is this: I have a permutation group G defined as the group of
permutations on {0..14}. Then I ask for subgroups, but the subgroups are
indexed with {1..15}. Are the indices just translated 1 to t
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