#4932: fix solve_left_LU for matrix_double_dense, which was totally broken
forever
(?)
------------------------------+---------------------------------------------
Reporter: was | Owner: jason
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.6.2
Component: linear algebra | Keywords:
Author: Rob Beezer | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by jason):
Replying to [comment:10 rbeezer]:
> According to:
>
>
http://docs.scipy.org/doc/numpy/reference/generated/numpy.linalg.solve.html#numpy.linalg.solve
>
> The generic "solve" from `NumPy` uses LU decomposition anyway, via an
LAPACK routine.
>
> So it does not appear to me that {{{solve_left_LU}}} adds anything to
{{{solve_left}}}?
The point behind this patch is that the LU decomposition is cached in the
matrix so that multiple solves using this matrix are much faster because
you don't have to compute the LU decomposition each time.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4932#comment:12>
Sage <http://www.sagemath.org>
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