petsc-3.13.6 2020-09-29

MatRegister

- Adds a new matrix type

#include "petscmat.h" 
PetscErrorCode  MatRegister(const char sname[],PetscErrorCode (*function)(Mat))

Not Collective

	name	- name of a new user-defined matrix type
	routine_create	- routine to create method context

MatRegister() may be called multiple times to add several user-defined solvers.

   MatRegister("my_mat",MyMatCreate);

Then, your solver can be chosen with the procedural interface via

    MatSetType(Mat,"my_mat")

or at runtime via the option

    -mat_type my_mat

advanced