petsc-3.3-p7 2013-05-11

MatRestrict

y = A*x or A'*x

#include "petscmat.h" 
PetscErrorCode  MatRestrict(Mat A,Vec x,Vec y)

Neighbor-wise Collective on Mat

	mat	- the matrix
	x,y	- the vectors

This allows one to use either the restriction or interpolation (its transpose) matrix to do the restriction