petsc-3.7.5 2017-01-01

MatShellGetOperation

Gets a matrix function for a shell matrix.

Synopsis

#include "petscmat.h" 
PetscErrorCode  MatShellGetOperation(Mat mat,MatOperation op,void(**f)(void))

Not Collective

Input Parameters

	mat	- the shell matrix
	op	- the name of the operation

Output Parameter

f -the function that provides the operation.

Notes

See the file include/petscmat.h for a complete list of matrix operations, which all have the form MATOP_<OPERATION>, where <OPERATION> is the name (in all capital letters) of the user interface routine (e.g., MatMult() -> MATOP_MULT).

All user-provided functions have the same calling sequence as the usual matrix interface routines, since they are intended to be accessed via the usual matrix interface routines, e.g.,

      MatMult(Mat,Vec,Vec) -> usermult(Mat,Vec,Vec)

Within each user-defined routine, the user should call MatShellGetContext() to obtain the user-defined context that was set by MatCreateShell().

Keywords