PETSc version 3.16.5
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# PCHPDDMSetAuxiliaryMat

Sets the auxiliary matrix used by PCHPDDM for the concurrent GenEO problems at the finest level. As an example, in a finite element context with nonoverlapping subdomains plus (overlapping) ghost elements, this could be the unassembled (Neumann) local overlapping operator. As opposed to the assembled (Dirichlet) local overlapping operator obtained by summing neighborhood contributions at the interface of ghost elements.

### Synopsis

    #include "petscpc.h"
    PetscErrorCode PCHPDDMSetAuxiliaryMat(PC pc, IS is, Mat A, PetscErrorCode (*setup)(Mat, PetscReal, Vec, Vec, PetscReal, IS, void*), void* setup_ctx)

### Input Parameters

| pc | - preconditioner context
| is | - index set of the local auxiliary, e.g., Neumann, matrix
| A | - auxiliary sequential matrix
| setup | - function for generating the auxiliary matrix
| setup_ctx | - context for setup

### See Also

PCCreate(), PCSetType(), PCType (for list of available types), PC, PCHPDDMSetRHSMat(), MATIS

### Level

intermediate

### Location

src/ksp/pc/impls/hpddm/hpddm.cxx

### Examples

src/ksp/ksp/tutorials/ex76.c.html
src/ksp/ksp/tutorials/ex82.c.html
src/ksp/ksp/tutorials/ex76f.F90.html

### Implementations

PCHPDDMSetAuxiliaryMat_HPDDM(PC pc, IS is, Mat A, PetscErrorCode (*setup) in src/ksp/pc/impls/hpddm/hpddm.cxx
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