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[Octave-bug-tracker] [bug #41192] Basic matrix inversion fails in MSVC b

From: Michael Goffioul
Subject: [Octave-bug-tracker] [bug #41192] Basic matrix inversion fails in MSVC build for Windows
Date: Mon, 24 Feb 2014 03:44:55 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.117 Safari/537.36

Update of bug #41192 (project octave):

                  Status:               Need Info => Wont Fix               
             Open/Closed:                    Open => Closed                 


Follow-up Comment #12:

After testing, it appears the problem lies in OpenBLAS. If you select another
linear algebra library during installation, the problem does not occur.

The Octave/MSVC 3.6.4 still uses OpenBLAS-0.2.2. I've tried with a newer
version of OpenBLAS, 0.2.8, and the problem does not occur either. Looking at
OpenBLAS changelog, a couple of bugs have been fixed in gemm/gemv computation
on x86/x86_64 CPU. I think you may have hit one of those bugs.

I've uploaded this newer OpenBLAS library here:
Install it into octave bin/ subdirectory, as vc100-libblas.dll. This is only
needed if OpenBLAS was selected as linear algebra library during

I'm closing this bug as it'll be fixed automatically when a new Octave/MSVC
binary is ever generated.


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