DSYEVD fails to converge

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DSYEVD fails to converge

Postby duncanpo » Thu Sep 12, 2013 12:10 pm

Hi,

We have run into a case where DSYEVD fails to converge for a 202x202 matrix (returns INFO=15529).
DSYEV converges for the same matrix successfully.

I attempted to upload the repro program and test matrix but failed because there is a 256KB limit on size and my zip file is 410KB. Please let me know how I can get the files to you.

Thanks.

Duncan Po
MathWorks
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Re: DSYEVD fails to converge

Postby Julien Langou » Wed Nov 27, 2013 1:15 pm

Hi Duncan,

Thanks for providing us with a matrix that beaks DYSEVD! (Do I really mean “thanks” here? ;) .)

I did not do anything fancy, just compiled and ran, and yep INFO = 15529 on my end as well.
Either with reference netlib LAPACK (trunk version) or vecLib. I guess we’ll have a look at this soon. Thanks.

lapackers: The matrix in the lapack svn repository under “./lapack/bugs/bug115/“

Cheers,
Julien.
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