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Data Error at pos 1

PostPosted: Sun Jan 30, 2011 3:54 pm
by scodyer
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.

Re: Data Error at pos 1

PostPosted: Sun Jan 30, 2011 3:59 pm
by kyle
A data error in this routine indicates a singular matrix with a zero on the diagonal.

Re: Data Error at pos 1

PostPosted: Tue Feb 01, 2011 5:27 pm
by scodyer
Okay, that is what I was guessing. Thank you.

Re: Data Error at pos 1

PostPosted: Wed Feb 02, 2011 7:55 am
by john
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.