#19045: better subs method for matrices
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Reporter: vdelecroix | Owner:
Type: enhancement | Status: closed
Priority: major | Milestone: sage-6.9
Component: linear algebra | Resolution: fixed
Keywords: | Merged in:
Authors: Vincent Delecroix | Reviewers: Nathann Cohen,
Report Upstream: N/A | Thierry Monteil
Branch: | Work issues:
59990af70ddf8f7de42d7c781b12248977eac664| Commit:
Dependencies: | Stopgaps:
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Comment (by vdelecroix):
Replying to [comment:14 tmonteil]:
> - the problem this ticket is supposed to address is about the .subs()
method changing the parent (see the linked thread). Is it fixed ?
Yes
{{{
sage: R.<x> = PolynomialRing(ZZ)
sage: m = matrix(R, [[x]])
sage: m.subs(3).parent()
Full MatrixSpace of 1 by 1 dense matrices over Integer Ring
}}}
> - the problem actually comes from an inconsistent subs for polynomials.
This is usually called a dependency, and there is even a field for that on
trac, so that we ensure the actual problem get solved.
This is '''not''' a dependency. But I opened #19130.
> - having ticket merged that fast is a good way not to fix the real
problem.
not merging ticket is also a good way to not fix it ;-)
--
Ticket URL: <http://trac.sagemath.org/ticket/19045#comment:15>
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