Allows user to set a matrix operation for any matrix type


#include "petscmat.h" 
PetscErrorCode MatSetOperation(Mat mat,MatOperation op,void (*f)(void))
Logically Collective on Mat

Input Parameters

mat - the matrix
op - the name of the operation
f - the function that provides the operation

Level: developer


     extern PetscErrorCode usermult(Mat,Vec,Vec);
     ierr = MatCreateXXX(comm,...&A);
     ierr = MatSetOperation(A,MATOP_MULT,(void(*)(void))usermult);


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 (except for MATOP_DESTROY) should 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)

In particular each function MUST return an error code of 0 on success and nonzero on failure.

This routine is distinct from MatShellSetOperation() in that it can be called on any matrix type.

See Also

MatGetOperation(), MatCreateShell(), MatShellSetContext(), MatShellSetOperation()