Hi all, I need to solve a PDE ( basically a Poisson's equation with Neumann boundary condition ), and I solved it using a steepest descent method, which is very slow. Now I want to solve the PDE using GMRES. In addition, I do have the matrix A, but I have a function which computes Ax, so I also need to use the matrix free method.
I am very new to PETSc, so I am looking for examples on solving linear systems using GMRES and/or matrix-free method. Thanks, Xiang -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110607/c80df704/attachment.htm>
