#14508: jordan_form fails when base field specified
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Reporter: itolkov | Owner: itolkov
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.13
Component: linear algebra | Resolution:
Keywords: | Merged in:
Authors: Igor Tolkov | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by darij):
BTW, the `change_ring` methods on all the matrix classes I've checked
(dense integer matrices, dense rational matrices, dense generic matrices)
start out (more or less -- sometimes, the ring is first checked for being
a ring) by checking whether the ring to map into is already the base ring,
and if so, do nothing or simply copy the matrix if it's mutable. So it
shouldn't be a bad slowdown or something. And with my patch, it happens
only if the user explicitly specifies the `base_ring` variable. So is this
still an issue?
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Ticket URL: <http://trac.sagemath.org/ticket/14508#comment:10>
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