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#
Examples#
Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages