VecStrideNormAll#

Computes the norms of subvectors of a vector defined by a starting point and a stride.

Synopsis#

#include "petscvec.h" 
PetscErrorCode VecStrideNormAll(Vec v, NormType ntype, PetscReal nrm[])

Collective

Input Parameters#

Output Parameter#

  • nrm - the norms

Notes#

One must call VecSetBlockSize() before this routine to set the stride information, or use a vector created from a multicomponent DMDA.

If x is the array representing the vector x then this computes the norm of the array (x[start],x[start+stride],x[start+2*stride], ….) for each start < stride

The dimension of nrm must be the same as the vector block size

This will only work if the desire subvector is a stride subvector

See Also#

Vec, VecNorm(), VecStrideGather(), VecStrideScatter(), VecStrideMin(), VecStrideMax()

Level#

advanced

Location#

src/vec/vec/utils/vinv.c


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