Re: [petsc-users] self-defined preconditioner available?

Xiaoyin:

I was wondering if petsc could convert an existing matrix into a preconditioner and use it in ksp solvers...thought this shall be a straight-forward question but I didn't find the answer in manuals. Thanks a lot.

Yes, you can. See "Shell Preconditioners" in petsc user manual. Also, check out ~petsc/src/ksp/ksp/examples/tutorials/ex15.c as an example. Hong