#11589: faster zero matrix creation
------------------------------+---------------------------------------------
Reporter: malb | Owner: jason, was
Type: enhancement | Status: needs_review
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):
Replying to [comment:9 SimonKing]:
> I recall that in some arithmetic routines of matrices, zero matrices are
created at the beginning. I am not sure whether that is done "the official
way" or by ''always'' copying a zero matrix, but I think it was the
latter. That might be worth while to fix as well.
I found it. It is the `_multiply_strassen` method in `matrix2.pyx`, which
says:
{{{
if self.is_sparse():
output = self.matrix_space(self._nrows, right._ncols, sparse =
True)(0)
else:
output = self.matrix_space(self._nrows, right._ncols, sparse =
False).zero_matrix().__copy__()
}}}
I think that ought to be improved, but that would better be on another
ticket.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11589#comment:14>
Sage <http://www.sagemath.org>
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