|
| From: | Rik |
| Subject: | [Octave-bug-tracker] [bug #44722] linsolve.m: Rand unit test fails randomly... |
| Date: | Sat, 04 Apr 2015 20:39:36 +0000 |
| User-agent: | Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:36.0) Gecko/20100101 Firefox/36.0 |
Follow-up Comment #6, bug #44722 (project octave):
@Julien: Now it makes sense (comment #5). Octave used to interpret
A' \ b
as
(A') \ b
The transpose was done in Octave and then the work of the left division
operator was left to BLAS/LAPACK.
This was completely inefficient as BLAS/LAPACK have options for indicating
whether a matrix is being entered in a transposed form or not. Now we just
call BLAS and give the correct options, but it could lead to a small
difference in calculation.
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