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# PetscCalloc1
Allocates a cleared (zeroed) array of memory aligned to `PETSC_MEMALIGN` 
## Synopsis
```
#include <petscsys.h>
PetscErrorCode PetscCalloc1(size_t m1,type **r1)
```
Not Collective


## Input Parameter

- ***m1 -*** number of elements to allocate in 1st chunk  (may be zero)



## Output Parameter

- ***r1 -*** memory allocated





## Notes
See `PetsMalloc1()` for more details on usage.


## See Also
 `PetscFree()`, `PetscNew()`, `PetscMalloc()`, `PetscMalloc1()`, `PetscCalloc2()`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/include/petscsys.h.html#PetscCalloc1">include/petscsys.h</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/tutorials/ex6.c.html">src/dm/impls/plex/tutorials/ex6.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex59.c.html">src/ksp/ksp/tutorials/ex59.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex73.c.html">src/ksp/ksp/tutorials/ex73.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex82.c.html">src/ksp/ksp/tutorials/ex82.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex31.c.html">src/snes/tutorials/ex31.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex36.c.html">src/snes/tutorials/ex36.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/tutorials/ex3.c.html">src/tao/tutorials/ex3.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex18.c.html">src/ts/tutorials/ex18.c</A><BR>


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