petsc-3.8.4 2018-03-24

VecMax

Determines the maximum vector component and its location.

#include "petscvec.h"   
PetscErrorCode  VecMax(Vec x,PetscInt *p,PetscReal *val)

Collective on Vec

x -the vector

	val	- the maximum component
	p	- the location of val (pass NULL if you don't want this)

Returns the value PETSC_MIN_REAL and p = -1 if the vector is of length 0.

Returns the smallest index with the maximum value