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# PetscDrawHGCreate
Creates a histogram data structure. 
## Synopsis
```
#include "petscdraw.h" 
#include "petscsys.h" 
#include "petscviewer.h" 
PetscErrorCode PetscDrawHGCreate(PetscDraw draw, int bins, PetscDrawHG *hist)
```
Collective


## Input Parameters

- ***draw  -*** The window where the graph will be made
- ***bins -*** The number of bins to use



## Output Parameter

- ***hist -*** The histogram context





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

The histogram is only displayed when `PetscDrawHGDraw()` is called.

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


## See Also
 `PetscDrawHGDestroy()`, `PetscDrawHG`, `PetscDrawBarCreate()`, `PetscDrawBar`, `PetscDrawLGCreate()`, `PetscDrawLG`, `PetscDrawSPCreate()`, `PetscDrawSP`,
`PetscDrawHGSetNumberBins()`, `PetscDrawHGReset()`, `PetscDrawHGAddValue()`, `PetscDrawHGDraw()`, `PetscDrawHGSave()`, `PetscDrawHGView()`, `PetscDrawHGSetColor()`,
`PetscDrawHGSetLimits()`, `PetscDrawHGCalcStats()`, `PetscDrawHGIntegerBins()`, `PetscDrawHGGetAxis()`, `PetscDrawAxis`, `PetscDrawHGGetDraw()`

## Level
intermediate

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


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