:orphan:
# ISBlockGetLocalSize
Returns the local number of blocks in the index set of `ISType` `ISBLOCK` 
## Synopsis
```
#include "petscis.h"     
PetscErrorCode ISBlockGetLocalSize(IS is, PetscInt *size)
```
Not Collective


## Input Parameter

- ***is -*** the index set



## Output Parameter

- ***size -*** the local number of blocks





## See Also
 [](sec_scatter), `IS`, `ISGetBlockSize()`, `ISBlockGetSize()`, `ISGetSize()`, `ISCreateBlock()`, `ISBLOCK`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/is/impls/block/block.c.html#ISBlockGetLocalSize">src/vec/is/is/impls/block/block.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/is/tutorials/ex3.c.html">src/vec/is/is/tutorials/ex3.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/is/tutorials/ex3f90.F90.html">src/vec/is/is/tutorials/ex3f90.F90</A><BR>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/is/impls/block/block.c.html#ISBlockGetLocalSize_Block">ISBlockGetLocalSize_Block in src/vec/is/is/impls/block/block.c</A><BR>


---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/is/is/impls/block/block.c)


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