#11589: faster zero matrix creation
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Reporter: malb | Owner: jason, was
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.7.2
Component: linear algebra | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author: Martin Albrecht, Simon King
Merged: | Dependencies:
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Comment(by SimonKing):
Hi Martin,
Thank you for creating the patch!
I don't like that the timings became a little slower for small matrices.
We should try to find out why that happens.
I think we should use calloc ''only'' when the argument `entries` is not a
list. Namely, ''if'' it is a list then the matrix will be initialised by
direct assignments anyway. Hence, in that case there is no need to
initialise with calloc.
Did you carefully determine the threshold for which calloc becomes faster
than copying? Or is "nrows, ncols > 100" just a guess?
Cheers,
Simon
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11589#comment:2>
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