# DMLabelHasPoint
Determine whether a label assigns a value to a point 
## Synopsis
```
#include "petscdmlabel.h"   
#include "petscsection.h"   
PetscErrorCode DMLabelHasPoint(DMLabel label, PetscInt point, PetscBool *contains)
```
Not collective


## Input Parameters

- ***label -*** the DMLabel
- ***point -*** the point



## Output Parameter

- ***contains -*** Flag indicating whether the label maps this point to a value


Note: The user must call DMLabelCreateIndex() before this function.




## See Also
 `DMLabelCreateIndex()`, `DMLabelGetValue()`, `DMLabelSetValue()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/label/dmlabel.c.html#DMLabelHasPoint">src/dm/label/dmlabel.c</A>


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


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