I'm trying to use the iterative-direct solver in Pardiso by changing the default value of iparm. However that didn't work.
I have a nonsymmetric matrix, so I set iparm = 61. However, when I print out iparm, which contains the CG/CGS diagnostics information, it always says 0. That implies CG wasn't run at all. In my code, when I first solve the linear system, I set phase to be 13. After that, I set the phase to be 23 (so that it doesn't have to factorize every time). The input for my matrix type mtype is 11.
I then tried a symmetric positive definite matrix and set iparm = 62. I set mtype to be 2. That didn't work either: iparm returns 0.