petsc-3.9.4 2018-09-11

DMKSPSetComputeOperators

set KSP matrix evaluation function

Synopsis

#include "petscksp.h" 
PetscErrorCode DMKSPSetComputeOperators(DM dm,PetscErrorCode (*func)(KSP,Mat,Mat,void*),void *ctx)

Not Collective

Input Argument

	dm	- DM to be used with KSP
	func	- matrix evaluation function, see KSPSetComputeOperators() for calling sequence
	ctx	- context for matrix evaluation

Note

KSPSetComputeOperators() is normally used, but it calls this function internally because the user context is actually associated with the DM. This makes the interface consistent regardless of whether the user interacts with a DM or not. If DM took a more central role at some later date, this could become the primary method of setting the matrix.

Level

advanced

Location