PETSc version 3.15.5
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 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().
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