petsc-3.14.5 2021-03-03
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# DMCreate

Creates an empty DM object. The type can then be set with DMSetType().

### Synopsis

    #include "petscdm.h"
    #include "petscdmlabel.h"
    #include "petscds.h"
    PetscErrorCode  DMCreate(MPI_Comm comm,DM *dm)

If you never call DMSetType() it will generate an error when you try to use the vector.

Collective

### Input Parameter

| comm | - The communicator for the DM object

### Output Parameter

| dm | - The DM object

### See Also

DMSetType(), DMDA, DMSLICED, DMCOMPOSITE, DMPLEX, DMMOAB, DMNETWORK

### Level

beginner

### Location

src/dm/interface/dm.c

### Examples

src/dm/impls/plex/tutorials/ex5.c.html
src/dm/impls/forest/tutorials/ex1.c.html
src/dm/tutorials/ex20.c.html
src/dm/tutorials/swarm_ex1.c.html
src/dm/tutorials/swarm_ex2.c.html
src/dm/tutorials/swarm_ex3.c.html
src/ksp/ksp/tutorials/ex70.c.html
src/ts/tutorials/ex11.c.html
src/ts/utils/dmplexlandau/tutorials/ex2.c.html

### Implementations

DMCreate_Composite in src/dm/impls/composite/pack.c
DMCreate_DA in src/dm/impls/da/dacreate.c
DMCreate_Forest in src/dm/impls/forest/forest.c
DMCreate_pforest in src/dm/impls/forest/p4est/pforest.c
DMCreate_Moab in src/dm/impls/moab/dmmoab.cxx
DMCreate_Network in src/dm/impls/network/networkcreate.c
DMCreate_Patch in src/dm/impls/patch/patchcreate.c
DMCreate_Plex in src/dm/impls/plex/plexcreate.c
DMCreate_Product in src/dm/impls/product/product.c
DMCreate_Redundant in src/dm/impls/redundant/dmredundant.c
DMCreate_Shell in src/dm/impls/shell/dmshell.c
DMCreate_Sliced in src/dm/impls/sliced/sliced.c
DMCreate_Stag in src/dm/impls/stag/stag.c
DMCreate_Swarm in src/dm/impls/swarm/swarm.c
Index of all DM routines
Table of Contents for all manual pages
Index of all manual pages