Praveen C <[email protected]> writes: >> On 18-May-2018, at 7:46 PM, Jed Brown <[email protected]> wrote: >> >> You don't need to use a shell matrix to implement a shell >> preconditioner. When using a shell PC, you need to call KSPSetPC() -- >> you can unwrap that from TS -> SNES -> KSP. > > > Thanks Jed. > > Is it the case that I cannot use a shell matrix to implement a shell > preconditioner ?
They are two different concepts. You can use either or both.
