# DMCopyLabels
Copy labels from one `DM` mesh to another `DM` with a superset of the points 
## Synopsis
```
#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMCopyLabels(DM dmA, DM dmB, PetscCopyMode mode, PetscBool all, DMCopyLabelsMode emode)
```
Collective on dmA


## Input Parameters

- ***dmA -*** The `DM` object with initial labels
- ***dmB -*** The `DM` object to which labels are copied
- ***mode -*** Copy labels by pointers (`PETSC_OWN_POINTER`) or duplicate them (`PETSC_COPY_VALUES`)
- ***all  -*** Copy all labels including "depth", "dim", and "celltype" (`PETSC_TRUE`) which are otherwise ignored (`PETSC_FALSE`)
- ***emode -*** How to behave when a `DMLabel` in the source and destination `DM`s with the same name is encountered (see `DMCopyLabelsMode`)





## Note
This is typically used when interpolating or otherwise adding to a mesh, or testing.


## See Also
 `DMLabel`, `DMAddLabel()`, `DMCopyLabelsMode`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/interface/dm.c.html#DMCopyLabels">src/dm/interface/dm.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/label/tutorials/ex1.c.html">src/dm/label/tutorials/ex1.c.html</A><BR>


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