Dear all, Now I'm solving Maxwell's equations using finite difference method. In the beginning, I use BCGS to solve the linear system. It works, but converges slowly. And other solvers do not converge. Some others told me that QMR may be a good choice, so I tested it using matlab, the result shows that QMR works well than BCGS. I found that PETSc only provide TFQMR and TCQMR, so I wonder that why PETSc does not implement QMR solver. And is there a alternative solver that behaves like QMR?
Thanks. Best regards, Ce Qin
