I am using CLUSTER_SPARSE_SOLVER with real symmetric matrices. During phase 22 (Numerical factorization) I obtained error code equal to -4. Unfortunately, in the reference manual there is no explanation for -4. Could you help me to interpret it?
I am defining mtype as 2 (real and symmetric positive definite). I have checked the diagonal and there are no zeros. The sparse matrix I am using was generated by external tool and this matrix is supposed to be of mtype 2 (positive definite). So, -4 means that there is something wrong with the matrix?