[Octave-bug-tracker] [bug #37336] Incorrect result of rcond with Netlib LAPACK

[Sébastien Villemot]

Follow-up Comment #2, bug #37336 (project octave):

Sorry for the missing pieces of information.

By Netlib LAPACK I mean the reference implementation of LAPACK, distributed on
www.netlib.org.

By Atlas LAPACK I mean the version created by Atlas: many of its routines
directly come from Netlib LAPACK, but some are replaced by optimized
versions.

For Netlib LAPACK, I use version 3.4.1 (from Debian wheezy/sid amd64, package
liblapack-dev/liblapack3 version 3.4.1-6).

For Atlas LAPACK I use version 3.4.8 (from Debian wheezy/sid amd64, package
libatlas3-base version 3.8.4-9).

Note that in Debian we recently switched the default LAPACK flavour: the
default used to be Atlas LAPACK, but we recently switched (in atlas 3.8.4-8)
to Netlib LAPACK (for reasons which are off-topic here). If you are using
Debian wheezy/sid (as I think you do), you can check your current
LAPACK flavour with:

 sudo update-alternatives --display liblapack.so.3

and change it with:

 sudo update-alternatives --config liblapack.so.3

Finally, please find attached the C program which directly does the
calculation using LAPACK. You need to link it against libmatio (available in
package libmatio-dev), with something like:

 gcc rcond-test.c -o rcond-test -lmatio -llapack

The program expects burp.mat in the current directory.


(file #26545)
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Additional Item Attachment:

File name: rcond-test.c                   Size:1 KB


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