# DMSwarmGetField
Get access to the underlying array storing all entries associated with a registered field 
## Synopsis
```
#include "petscdmswarm.h"   
PetscErrorCode DMSwarmGetField(DM dm, const char fieldname[], PetscInt *blocksize, PetscDataType *type, void **data)
```
Not collective


## Input parameters

- ***dm -*** a DMSwarm
- ***fieldname -*** the textual name to identify this field



## Output parameters

- ***blocksize -*** the number of each data type
- ***type -*** the data type
- ***data -*** pointer to raw array





## Notes
The array must be returned using a matching call to DMSwarmRestoreField().


## See Also
 `DMSwarmRestoreField()`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/swarm/swarm.c.html#DMSwarmGetField">src/dm/impls/swarm/swarm.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/swarm/tutorials/ex1.c.html">src/dm/impls/swarm/tutorials/ex1.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/swarm/tutorials/ex1f90.F90.html">src/dm/impls/swarm/tutorials/ex1f90.F90.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/ex21.c.html">src/dm/tutorials/ex21.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/swarm_ex1.c.html">src/dm/tutorials/swarm_ex1.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/swarm_ex2.c.html">src/dm/tutorials/swarm_ex2.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/swarm_ex3.c.html">src/dm/tutorials/swarm_ex3.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex70.c.html">src/ksp/ksp/tutorials/ex70.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex63.c.html">src/snes/tutorials/ex63.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex77.c.html">src/ts/tutorials/ex77.c.html</A><BR>


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


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