PETSc version 3.17.0
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# MatCoarsenRegister

Adds a new sparse matrix coarsening algorithm to the matrix package.

### Synopsis

    #include "petscmatcoarsen.h"
    PetscErrorCode  MatCoarsenRegister(const char sname[],PetscErrorCode (*function)(MatCoarsen))

Logically Collective

### Input Parameters

| sname | - name of coarsen (for example MATCOARSENMIS)
| function | - function pointer that creates the coarsen type

### Sample usage

       MatCoarsenRegister("my_agg",MyAggCreate);

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

        MatCoarsenSetType(agg,"my_agg")

or at runtime via the option

        -mat_coarsen_type my_agg

### See Also

MatCoarsenRegisterDestroy(), MatCoarsenRegisterAll()

### Level

developer

### Location

src/mat/coarsen/coarsen.c
Index of all MatOrderings routines
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