petscmaster 20201025
MatShellGetOperation
Gets a matrix function for a shell matrix.
Synopsis
#include "petscmat.h"
PetscErrorCode MatShellGetOperation(Mat mat,MatOperation op,void(**g)(void))
Not Collective
Input Parameters
 mat   the shell matrix

 op   the name of the operation

Output Parameter
 g   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 userprovided 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 userdefined routine, the user should call
MatShellGetContext() to obtain the userdefined context that was
set by MatCreateShell().
See Also
MatCreateShell(), MatShellGetContext(), MatShellSetOperation(), MatShellSetContext()
Level
advanced
Location
src/mat/impls/shell/shell.c
Implementations
MatShellGetOperation_Shell(Mat mat,MatOperation op,void(**f) in src/mat/impls/shell/shell.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages