#14627: Make mod_int signed and speed up matrix_modn_dense_float
----------------------------------+-----------------------------------------
Reporter: vbraun | Owner: jason, was
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.11
Component: linear algebra | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers: Martin Albrecht
Authors: Volker Braun | Merged in:
Dependencies: #12728 | Stopgaps:
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Changes (by jdemeyer):
* status: positive_review => needs_work
Comment:
This breaks badly on 32-bit systems:
{{{
sage -t --long devel/sage/sage/matrix/matrix2.pyx
**********************************************************************
File "devel/sage/sage/matrix/matrix2.pyx", line 2320, in
sage.matrix.matrix2.Matrix.diagonal._right_kernel_matrix_over_field
Failed example:
P = result[1]; P
Expected:
[ -1 -1 1 0]
[-zeta14^3 -zeta14^4 0 1]
Got:
[
3716055149462127149669597391230365/1741122812024444137450032682964234
3716055149462127149669597391230365/1741122812024444137450032682964234
1
0]
[3716055149462127149669597391230365/1741122812024444137450032682964234*zeta14^3
3716055149462127149669597391230365/1741122812024444137450032682964234*zeta14^4
0
1]
**********************************************************************
}}}
And many more failures and timeouts:
[http://build.sagemath.org/sage/builders/NTU%20arando%20%28Ubuntu%2012.10%20i686%29/builds/182/steps/shell_8/logs/stdio]
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14627#comment:14>
Sage <http://www.sagemath.org>
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