petsc-3.14.5 2021-03-03
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# VecStrideGatherAll

Gathers all the single components from a multi-component vector into separate vectors.

### Synopsis

    #include "petscvec.h"
    PetscErrorCode  VecStrideGatherAll(Vec v,Vec s[],InsertMode addv)

Collective on Vec

### Input Parameter

| v | - the vector
| addv | - one of ADD_VALUES,INSERT_VALUES,MAX_VALUES

### Output Parameter

| s | - the location where the subvectors are stored

### 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 gathers the arrays (x[start],x[start+stride],x[start+2*stride], ....) for start=0,1,2,...bs-1

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

### See Also

VecStrideNorm(), VecStrideScatter(), VecStrideMin(), VecStrideMax(), VecStrideGather(),
VecStrideScatterAll()

### Level

advanced

### Location

src/vec/vec/utils/vinv.c

### Examples

src/vec/vec/tutorials/ex16.c.html
src/vec/vec/tutorials/ex16f.F90.html
Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages