petsc-3.9.4 2018-09-11

VecNormBegin

Starts a split phase norm computation.

#include "petscvec.h"    
PetscErrorCode  VecNormBegin(Vec x,NormType ntype,PetscReal *result)

	x	- the first vector
	ntype	- norm type, one of NORM_1, NORM_2, NORM_MAX, NORM_1_AND_2
	result	- where the result will go (can be NULL)

Each call to VecNormBegin() should be paired with a call to VecNormEnd().

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