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Re: [Bug-gsl] SV decomp failure

From: Rhys Ulerich
Subject: Re: [Bug-gsl] SV decomp failure
Date: Tue, 18 Sep 2012 12:18:39 -0500

> Looks to be that way. -O1 was fine. -O2 was not.

The "failed to converge" messages you reported come from
linalg/svd.c:149 which is part of the following check:

        if (iter > 100 * N)
            GSL_ERROR("SVD decomposition failed to converge", GSL_EMAXITER);

The N factor makes sense to me.  Can anyone comment on how 100 was
chosen?  The documentation says that this is the "Golub-Reinsch SVD

Peter, if you tweak that 100 to be some higher value can you get the
linalg 'make check' tests to pass at -O2 on your OS X system?

- Rhys

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