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[Octave-bug-tracker] [bug #65020] BLAS inv() incorrect on new intel arch

From: Rik
Subject: [Octave-bug-tracker] [bug #65020] BLAS inv() incorrect on new intel architecture
Date: Mon, 18 Dec 2023 18:56:37 -0500 (EST)

Update of bug#65020 (group octave):

                Category:         Octave Function => Libraries              
                  Status:                    None => Need Info              
             Open/Closed:                    Open => Closed                 
                 Summary: Issues with inv() on new intel architecture => BLAS
inv() incorrect on new intel architecture


Follow-up Comment #9:

I agree with Dmitri.  This feels like an upstream problem with BLAS or LAPACK

For what it's worth, I also run Ubuntu 22.04.  I'm using the default
libblas3:amd64 3.10.0-2ubuntu1.  From 'cat /proc/cpuinfo' my cpu is

model name      : 12th Gen Intel(R) Core(TM) i9-12900H

Using your test code I get 0.4608 as the first entry of either inv() or
pinv().  In other words, it works.

I would also note that version 6.4 of Octave is very, very old and is no
longer supported.  You might try a newer version just in case that helps.  I
see that you said you did build Octave from source, but I don't know if that
was 6.4 source or something more recent.


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