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# PetscDrawBarCreate
Creates a bar graph data structure. 
## Synopsis
```
#include "petscdraw.h" 
#include "petscviewer.h" 
PetscErrorCode PetscDrawBarCreate(PetscDraw draw, PetscDrawBar *bar)
```
Collective over draw


## Input Parameter

- ***draw  -*** The window where the graph will be made



## Output Parameter

- ***bar -*** The bar graph context



## Notes
Call `PetscDrawBarSetData()` to provide the bins to be plotted and then `PetscDrawBarDraw()` to display the new plot

The difference between a bar chart, `PetscDrawBar`, and a histogram, `PetscDrawHG`, is explained here https://stattrek.com/statistics/charts/histogram.aspx?Tutorial=AP

The MPI communicator that owns the `PetscDraw` owns this `PetscDrawBar`, but the calls to set options and add data are ignored on all processes except the
zeroth MPI rank in the communicator. All MPI ranks in the communicator must call `PetscDrawBarDraw()` to display the updated graph.




## See Also
 `PetscDrawBar`, `PetscDrawLGCreate()`, `PetscDrawLG`, `PetscDrawSPCreate()`, `PetscDrawSP`, `PetscDrawHGCreate()`, `PetscDrawHG`, `PetscDrawBarDestroy()`, `PetscDrawBarSetData()`,
`PetscDrawBar`, `PetscDrawBarDraw()`, `PetscDrawBarSave()`, `PetscDrawBarSetColor()`, `PetscDrawBarSort()`, `PetscDrawBarSetLimits()`, `PetscDrawBarGetAxis()`, `PetscDrawAxis`,
`PetscDrawBarGetDraw()`, `PetscDrawBarSetFromOptions()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/classes/draw/utils/bars.c.html#PetscDrawBarCreate">src/sys/classes/draw/utils/bars.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/classes/draw/utils/bars.c)


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