#8276: Make the one(), identity_matrix() and zero_matrix() cached and immutable.
------------------------------+---------------------------------------------
Reporter: hivert | Owner: hivert
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.3.3
Component: algebra | Keywords: One mutable.
Author: Florent Hivert | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by hivert):
* status: new => needs_work
Comment:
Correcting MatrixSpace is easy, however there are a lot of places in sage
where people create a matrix from the one or zero and modify it after
that. I nearly corrected all these occurences. However, I'm stuck with
those three files which are very complicated and depend one of each other:
{{{
sage/modular/quatalg/brandt.py
sage/algebras/quatalg/quaternion_algebra.py
sage/schemes/elliptic_curves/heegner.py
}}}
There are a lot of error but I can't find where it's coming from. I really
could use the help of a specialist.
Apply the patch in the following order:
{{{
trac_8276-MatrixSpace_one-fh.patch
trac_8276-fix_sagelib-fh.patch
}}}
Thanks for any suggestion.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8276#comment:2>
Sage <http://www.sagemath.org>
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