PETSc version 3.17.0
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# DMCompositeGetAccessArray

Allows one to access the individual packed vectors in their global representation.

### Synopsis

    #include "petscdmcomposite.h"
    PetscErrorCode  DMCompositeGetAccessArray(DM dm,Vec pvec,PetscInt nwanted,const PetscInt *wanted,Vec *vecs)

Collective on dm

### Input Parameters

| dm | - the packer object
| pvec | - packed vector
| nwanted | - number of vectors wanted
| wanted | - sorted array of vectors wanted, or NULL to get all vectors

### Output Parameters

| vecs | - array of requested global vectors (must be allocated)

### Notes

Use DMCompositeRestoreAccessArray() to return the vectors when you no longer need them

### See Also

DMCompositeGetAccess(), DMCompositeGetEntries(), DMCompositeScatter(), DMCompositeGather()

### Level

advanced

### Location

src/dm/impls/composite/pack.c

### Examples

src/snes/tutorials/ex73f90t.F90.html
src/ts/utils/dmplexlandau/tutorials/ex2.c.html
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