VecStrideSum#

Computes the sum of subvector of a vector defined by a starting point and a stride.

Synopsis#

#include "petscvec.h" 
PetscErrorCode VecStrideSum(Vec v, PetscInt start, PetscScalar *sum)

Collective

Input Parameters#

  • v - the vector

  • start - starting point of the subvector (defined by a stride)

Output Parameter#

  • sum - the sum

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 sum of the array (x[start],x[start+stride],x[start+2*stride], ….)

See Also#

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

Level#

advanced

Location#

src/vec/vec/utils/vinv.c

Examples#

src/vec/vec/tutorials/ex13.c


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Index of all Vec routines
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Index of all manual pages