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# DMCompositeCreate
Creates a `DMCOMPOSITE`, used to generate "composite" vectors made up of several subvectors.
## Synopsis
```
#include "petscdmcomposite.h"
PetscErrorCode DMCompositeCreate(MPI_Comm comm, DM *packer)
```
Collective
## Input Parameter
- ***comm -*** the processors that will share the global vector
## Output Parameter
- ***packer -*** the `DMCOMPOSITE` object
## See Also
`DMCOMPOSITE`, `DM`, `DMDestroy()`, `DMCompositeAddDM()`, `DMCompositeScatter()`, `DMCOMPOSITE`, `DMCreate()`
`DMCompositeGather()`, `DMCreateGlobalVector()`, `DMCompositeGetISLocalToGlobalMappings()`, `DMCompositeGetAccess()`
`DMCompositeGetLocalVectors()`, `DMCompositeRestoreLocalVectors()`, `DMCompositeGetEntries()`
## Level
advanced
## Location
src/dm/impls/composite/pack.c
## Examples
src/snes/tutorials/ex21.c
src/snes/tutorials/ex22.c
src/snes/tutorials/ex28.c
src/snes/tutorials/ex73f90t.F90
src/ts/tutorials/ex14.c
---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/impls/composite/pack.c)
[Index of all DM routines](index.md)
[Table of Contents for all manual pages](/manualpages/index.md)
[Index of all manual pages](/manualpages/singleindex.md)