#12499: The density() function of a sparse matrix looks at every matrix entry
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Reporter: jason | Owner: jason, was
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.0
Component: linear algebra | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by ppurka):
Replying to [comment:5 jason]:
> (It may very well be that replacing the matrix2.pyx version is much
slower because then it has to store and return a huge list of
nonzero_positions...)
I think you are right there. Returning a huge list will be computationally
intensive - the code will be nearly similar to the current code in
matrix2.pyx, requiring two `for` loops (see `nonzero_positions` in
matrix0.pyx. And the list itself will also gobble up tons of memory. The
current method seems best for general matrices.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12499#comment:7>
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