From whit.armstrong at hcmny.com  Fri Oct 20 00:50:56 2006
From: whit.armstrong at hcmny.com (Armstrong, Whit)
Date: Thu, 19 Oct 2006 18:50:56 -0400
Subject: [Rd] lapack tests fail  -- is this something to worry about?
Message-ID: <E58BE6136618CF4C964F6EC7773AE569C9A565@ex4.nyc.hcmny.com>

I see the comment here about some 64bit combinations failing.

Well, my configuration fails.  Is this really something to worry about?

for R-patched:
fi1->cat SVN-REVISION 
Revision: 39576
Last Changed Date: 2006-10-03
fi1->


> ## failed for some 64bit-Lapack-gcc combinations:
> sm <- cbind(1, 3:1, 1:3)
> eigenok(sm, eigen(sm))
Error: abs(A %*% V - V %*% diag(lam)) < Eps is not all TRUE
> eigenok(sm, eigen(sm, sym=FALSE))
Error: abs(A %*% V - V %*% diag(lam)) < Eps is not all TRUE
> 


I'm not using a nonstandard blas or lapack, just the ones included in R.


Here is my system information:

fi1->gcc --version
gcc (GCC) 3.2.3 20030502 (Red Hat Linux 3.2.3-47)
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.

fi1->uname -a
Linux fi1.nyc.office.hcmny.com 2.4.21-32.ELsmp #1 SMP Fri Apr 15
21:03:28 EDT 2005 x86_64 x86_64 x86_64 GNU/Linux
fi1->


This is RHEL v3.  I know gcc 3.2.3 is old, but I don't have root, and
our admins are not crazy about changing 1 system to accommodate 1 user,
so I'm happy to ignore the test failure if it's not something to worry
about.  I'm not using lapack routines in my code, but I don't know to
what extent R makes use of lapack internally.

Can anyone give me the skinny on whether this test failure really
matters?

Thanks,
Whit





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[Rd] lapack tests fail -- is this something to worry about?
Armstrong, Whit