N/APosted on - 08/24/2012
MKL 10.1 is used to solve sparse linear system which is symmetric and positive definitely. But PARDISO foils with error code 1 giving the message” Error in PARDISO: zero or negative pivot, A is not SPD matrix” during phase 22.
If any one finds the reason of this error, please help me.
Error Code 1 in PARDISO: zero or negative pivot
You will need to make sure that in C, you have specified iparm = 1 because C uses zero based array indices. You will be able to see the output from the matrix checker in the event that there are errors. To do a test of that, you will need to present the first row of the matrix in unsorted order, something like the following:
Instead of having 1,2,3,4,6, you will need to give something like 1,2,3,6,4,
Once you do that you will see the following:
*** Error in PARDISO (incorrect input matrix ) error_num= 24
*** Input check: j=4, ja(j)=6, ja(j+1)=4 are incompatible
ERROR during symbolic factorization: -1
Hope this helps.