Data Error at pos 1

General CULA Dense (LAPACK & BLAS) support and troubleshooting. Use this forum if you are having a general problem or have encountered a bug.

Data Error at pos 1

Postby scodyer » Sun Jan 30, 2011 3:54 pm

I've been getting the following error after calling culaSgesv():

Data error at pos 2 (see the CULA Reference Manual for more information)

Q: Any idea what the data error is referencing?

Note: I looked through the CULA reference Manual, and the data error section sends you to Lapack's documentations.. which inevitably leads you nowhere.

Thank you for any insight you might have.
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Re: Data Error at pos 1

Postby kyle » Sun Jan 30, 2011 3:59 pm

A data error in this routine indicates a singular matrix with a zero on the diagonal.
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Re: Data Error at pos 1

Postby scodyer » Tue Feb 01, 2011 5:27 pm

Okay, that is what I was guessing. Thank you.
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Re: Data Error at pos 1

Postby john » Wed Feb 02, 2011 7:55 am

It's probably more than a zero on the diagonal, as pivoting can avoid some of them. You have either two linearly dependent rows and/or a row or column of all zeros.
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