:orphan:
# DMPlexCreateFromFile
This takes a filename and produces a `DM` 
## Synopsis
```
#include "petscdmplex.h"   
#include "petscdmplex.h"   
PetscErrorCode DMPlexCreateFromFile(MPI_Comm comm, const char filename[], const char plexname[], PetscBool interpolate, DM *dm)
```
Collective


## Input Parameters

- ***comm -*** The communicator
- ***filename -*** A file name
- ***plexname -*** The object name of the resulting `DM`, also used for intra-datafile lookup by some formats
- ***interpolate -*** Flag to create intermediate mesh pieces (edges, faces)



## Output Parameter

- ***dm -*** The `DM`



## Options Database Key

- ***-dm_plex_create_from_hdf5_xdmf -*** use the `PETSC_VIEWER_HDF5_XDMF` format for reading HDF5


Use `-dm_plex_create_ prefix` to pass options to the internal `PetscViewer`, e.g.
```none
-dm_plex_create_viewer_hdf5_collective
```




## Notes
Using `PETSCVIEWERHDF5` type with `PETSC_VIEWER_HDF5_PETSC` format, one can save multiple `DMPLEX`
meshes in a single HDF5 file. This in turn requires one to name the `DMPLEX` object with `PetscObjectSetName()`
before saving it with `DMView()` and before loading it with `DMLoad()` for identification of the mesh object.
The input parameter name is thus used to name the `DMPLEX` object when `DMPlexCreateFromFile()` internally
calls `DMLoad()`. Currently, name is ignored for other viewer types and/or formats.


## See Also
 [](ch_unstructured), `DM`, `DMPLEX`, `DMPlexCreateFromDAG()`, `DMPlexCreateFromCellListPetsc()`, `DMPlexCreate()`, `PetscObjectSetName()`, `DMView()`, `DMLoad()`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/plexcreate.c.html#DMPlexCreateFromFile">src/dm/impls/plex/plexcreate.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/tutorials/ex5.c.html">src/dm/impls/plex/tutorials/ex5.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/label/tutorials/ex1.c.html">src/dm/label/tutorials/ex1.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/label/tutorials/ex1f90.F90.html">src/dm/label/tutorials/ex1f90.F90</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex48.c.html">src/ts/tutorials/ex48.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/impls/plex/plexcreate.c)


[Index of all DMPlex routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)