petsc-3.7.7 2017-09-25

VecStrideScatter

Scatters a single component from a vector into a multi-component vector.

Synopsis

#include "petscvec.h" 
PetscErrorCode  VecStrideScatter(Vec s,PetscInt start,Vec v,InsertMode addv)

Collective on Vec

Input Parameter

	s	- the single-component vector
	start	- starting point of the subvector (defined by a stride)
	addv	- one of ADD_VALUES,INSERT_VALUES,MAX_VALUES

Output Parameter

v -the location where the subvector is scattered (the multi-component vector)

Notes

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

The parallel layout of the vector and the subvector must be the same; i.e., nlocal of v = stride*(nlocal of s)

Not optimized; could be easily

Examples