petsc-3.7.7 2017-09-25
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VecNormBegin

 Starts a split phase norm computation.

Synopsis

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

Input Parameters

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)

Notes

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

See Also

VecNormEnd(), VecNorm(), VecDot(), VecMDot(), VecDotBegin(), VecDotEnd(), PetscCommSplitReductionBegin()

Level:advanced
Location:src/vec/vec/utils/comb.c
Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages