MGSetResidual

Sets the function to be used to calculate the residual on the lth level.

#include "petscsles.h" 
#include "petscmg.h"   
int MGSetResidual(PC pc,int l,int (*residual)(Mat,Vec,Vec,Vec),Mat mat)

Collective on PC and Mat

	pc	- the multigrid context
	l	- the level to supply
	residual	- function used to form residual (usually MGDefaultResidual)
	mat	- matrix associated with residual

MG, set, multigrid, residual, level