# VecStrideMaxAll
Computes the maximums of subvectors of a vector defined by a starting point and a stride and optionally its location. 
## Synopsis
```
#include "petscvec.h" 
PetscErrorCode VecStrideMaxAll(Vec v, PetscInt idex[], PetscReal nrm[])
```
Collective


## Input Parameter

- ***v -*** the vector



## Output Parameters

- ***index -*** the location where the maximum occurred (not supported, pass NULL,
if you need this, send mail to petsc-maint@mcs.anl.gov to request it)
- ***nrm -*** the maximum values of each subvector



## Notes
One must call VecSetBlockSize() before this routine to set the stride
information, or use a vector created from a multicomponent DMDA.

The dimension of nrm must be the same as the vector block size




## See Also
 `VecMax()`, `VecStrideNorm()`, `VecStrideGather()`, `VecStrideScatter()`, `VecStrideMin()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/utils/vinv.c.html#VecStrideMaxAll">src/vec/vec/utils/vinv.c</A>


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