#17585: Implement coordinate_ring() for free module elements
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Reporter: jdemeyer | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.5
Component: linear algebra | Resolution:
Keywords: | Merged in:
Authors: Jeroen Demeyer | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jdemeyer/ticket/17585 | dbca6bb7915f3084b04af6943689ab0d244d7032
Dependencies: #17584, #17694, | Stopgaps:
#13081, #12600 |
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Comment (by vdelecroix):
Replying to [comment:23 jdemeyer]:
> Replying to [comment:22 vdelecroix]:
> > 2. What is the point of the `ring` argument of `basis_matrix`?
Moreover the implementation looks wrong since it returns the matrix `A`
(defined over the `coordinate_ring`) as soon as `ring` is the
`base_ring`.
> At one point during development of this ticket, I needed an explicit
ring to work-around #16399. Instead, #16399 got fixed, so this work-around
was no longer needed. I did keep the change to `basis_matrix()`. Does this
extra argument really hurt? I could remove it if you want. The
implementation is correct though: I think you are confusing the
`base_ring` of the matrix with the `coordinate_ring` of the module.
Could you at least include an example in the documentation?
--
Ticket URL: <http://trac.sagemath.org/ticket/17585#comment:24>
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