petsc-3.9.4 2018-09-11

MatNestSetSubMat

Set a single submatrix in the nest matrix.

#include "petscmat.h"   
PetscErrorCode  MatNestSetSubMat(Mat A,PetscInt idxm,PetscInt jdxm,Mat sub)

Logically collective on the submatrix communicator

	A	- nest matrix
	idxm	- index of the matrix within the nest matrix
	jdxm	- index of the matrix within the nest matrix
	sub	- matrix at index idxm,jdxm within the nest matrix

The new submatrix must have the same size and communicator as that block of the nest.

This increments the reference count of the submatrix.

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