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# VecStrideMin
Computes the minimum of subvector of a vector defined by a starting point and a stride and optionally its location. 
## Synopsis
```
#include "petscvec.h" 
PetscErrorCode VecStrideMin(Vec v, PetscInt start, PetscInt *idex, PetscReal *nrm)
```
Collective


## Input Parameters

- ***v -*** the vector
- ***start -*** starting point of the subvector (defined by a stride)



## Output Parameters

- ***idex -*** the location where the minimum occurred. (pass `NULL` if not required)
- ***nrm -*** the minimum value in the subvector





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

If xa is the array representing the vector x, then this computes the min
of the array (xa[start],xa[start+stride],xa[start+2*stride], ....)

This is useful for computing, say the minimum of the pressure variable when
the pressure is stored (interlaced) with other variables, e.g., density, etc.
This will only work if the desire subvector is a stride subvector.


## See Also
 `Vec`, `VecMin()`, `VecStrideNorm()`, `VecStrideGather()`, `VecStrideScatter()`, `VecStrideMax()`

## Level
advanced

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

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex70.c.html">src/ksp/ksp/tutorials/ex70.c</A><BR>


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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)  
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[Index of all manual pages](/manualpages/singleindex.md)