# VecTaggerGetBlockSize
get the block size of the indices created by VecTaggerComputeIS(). 
## Synopsis
```
#include "petscvec.h" 
PetscErrorCode VecTaggerGetBlockSize(VecTagger tagger, PetscInt *blocksize)
```
Logically Collective


## Input Parameter

- ***tagger -*** vec tagger



## Output Parameter

- ***blocksize -*** block size of the vectors the tagger operates on





## See Also
 `VecTaggerComputeIS()`, `VecTaggerSetBlockSize()`, `VecTagger`, `VecTaggerCreate()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/utils/tagger/interface/tagger.c.html#VecTaggerGetBlockSize">src/vec/vec/utils/tagger/interface/tagger.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/utils/tagger/tutorials/ex1.c.html">src/vec/vec/utils/tagger/tutorials/ex1.c.html</A><BR>


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


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