Error in PARDISO: zero or negative pivot, A is not SPD-matrix

Asked By abrahamahartman 60 points N/A Posted on - 07/30/2012

Hello,

I am running MKL 10.1 to solve sparse linear system.

My system is symmetric as well as positive definite however in the phase 22 PARDISO not succeeds with error message code -1 and message is 'Error in PARDISO: zero or negative pivot, A is not SPD-matrix'

What should I do now to solve this error? Please help.

Thanks in advance.

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Answered By Carl Jack 10 points N/A #141466

Error in PARDISO: zero or negative pivot, A is not SPD-matrix

Hello Abraham,

The error you are getting while using MKL usually occurs in the event when there is a problem at the time of factorization. The error can also occur during the iterative refinement period when you are trying to get a solution. When the error message indicates zero or negative pivot, A is not SPD-matrix, then it means that the original matrix is not equal to SPD.

The reason for such an occurrence is probably due to inaccuracies in the arithmetic, and therefore you will need to check that out and correct the errors. After that the application should work without problems.

Hope this helps.

Regards,

Carl

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• Posted on - 07/30/2012
• Question Category: ProgScripting Languages