Hi,
I'm trying to use PARDISO to solve a linear system with the left hand side being symmetric but very ill-conditioned. I tried to run the solver but with "zero or negative poivting, and A is not SPD matrix" error message when I set mtype = 2. I also tried to change mtype to -2, although the system was solved, the solution didn't make any sense. It's completely wrong.
Can anybody tell me is this system solvable using PARDISO? If so, how to configure the iparm parameters? I have attached the input matrixes. P is the single right hand side. Thanks for any suggestion.
