VecNormAvailable

Returns the vector norm if it is already known. That is, it has been previously computed and cached in the vector

Synopsis

#include "petscvec.h"   
PetscErrorCode VecNormAvailable(Vec x, NormType type, PetscBool *available, PetscReal *val)

Not Collective

Input Parameters

• x - the vector

• type - one of NORM_1 (sum_i |x[i]|), NORM_2 sqrt(sum_i (x[i])^2), NORM_INFINITY max_i |x[i]|. Also available NORM_1_AND_2, which computes both norms and stores them in a two element array.

Output Parameters

• available - PETSC_TRUE if the val returned is valid

• val - the norm

See Also

Vectors and Parallel Data, Vec, VecDot(), VecTDot(), VecNorm(), VecDotBegin(), VecDotEnd(), VecNormBegin(), VecNormEnd()

Level

intermediate

Location

src/vec/vec/interface/rvector.c

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Index of all Vec routines
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Index of all manual pages