#18979: avoid Maxima on creation of symbolic matrices
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Reporter: rws | Owner:
Type: | Status: positive_review
defect | Milestone: sage-6.9
Priority: major | Resolution:
Component: | Merged in:
linear algebra | Reviewers: Vincent Delecroix
Keywords: | Work issues:
Authors: Nils | Commit:
Bruin | e42f2858c851693464226fad3532efedf50de3b2
Report Upstream: N/A | Stopgaps:
Branch: |
u/nbruin/18979 |
Dependencies: |
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Comment (by nbruin):
Replying to [comment:24 vdelecroix]:
> Right, but for sparse matrices it is explicitely assumed that only
nonzero entries are stored... what should we do in that case?
Different problem, different ticket. Of course, one should only avoid
comparisons if one can.
Since matrices rarely "accidentally" remain sparse, you probably get
decent performance by just assuming any entry that is actually given, is
nonzero (so no explicit checks necessary). Of course that doesn't work
when converting a dense matrix to a sparse one.
If this is an issue, perhaps we should have a special "comparison
avoiding" sparse matrix class.
--
Ticket URL: <http://trac.sagemath.org/ticket/18979#comment:25>
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