hi there, I want to link my own package with PETSc in order to make use of its various preconditioners. I am using matrix free method, so that I can directly refer the large matrix saved in my own format. The connection works OK without preconditioners, but runs into trouble when most of the preconditioners is called. For example, I got this message when using PCICC preconditionder:
Matrix format shell does not have a built-in PETSc direct solver! So my question is how to utilize PETSc's powerful preconditioners for my matrix-free application. Thanks, Rocky
