# DMComputeVariableBounds
compute variable bounds used by `SNESVI`. 
## Synopsis
```
#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMComputeVariableBounds(DM dm, Vec xl, Vec xu)
```
Logically Collective on dm


## Input Parameter

- ***dm -*** the `DM` object



## Output parameters

- ***xl -*** lower bound
- ***xu -*** upper bound





## Notes
This is generally not called by users. It calls the function provided by the user with DMSetVariableBounds()


## See Also
 `DMHasVariableBounds()`, `DMView()`, `DMCreateGlobalVector()`, `DMCreateInterpolation()`, `DMCreateColoring()`, `DMCreateMatrix()`, `DMCreateMassMatrix()`, `DMGetApplicationContext()`

## Level
advanced

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


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


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