#11356: Companion matrix constructor
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Reporter: rbeezer | Owner: jason, was
Type: enhancement | Status: needs_work
Priority: minor | Milestone: sage-4.7.1
Component: linear algebra | Keywords: beginner, sd31
Work_issues: | Upstream: N/A
Reviewer: | Author: Rob Beezer
Merged: | Dependencies:
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Changes (by ddrake):
* status: needs_review => needs_work
Comment:
If you feed `companion_matrix` the empty list, it complains about an
`IndexError`. I'd rather see it:
* return the empty matrix, or
* change line 2839 to `if n == 0 or or not poly[n] == 1:` so that the
`ValueError` actually gets raised.
Returning the empty matrix seems about right, but I can imagine people
having strong opinions about the zero polynomial not being monic. I don't
know about the conventions in this corner case, so do whatever seems best.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11356#comment:13>
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