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# PCHYPRESetAlphaPoissonMatrix
Set vector Poisson matrix for `PCHYPRE` of type ams 
## Synopsis
```
#include "petscpc.h" 
PetscErrorCode PCHYPRESetAlphaPoissonMatrix(PC pc, Mat A)
```
Collective


## Input Parameters

- ***pc -*** the preconditioning context
- ***A -*** the matrix





## Note
A should be obtained by discretizing the vector valued Poisson problem with linear finite elements


## Developer Note
This automatically converts the matrix to `MATHYPRE` if it is not already of that type

If this is only for  `PCHYPRE` type of ams it should be called `PCHYPREAMSSetAlphaPoissonMatrix()`


## See Also
 `PCHYPRE`, `PCHYPRESetDiscreteGradient()`, `PCHYPRESetDiscreteCurl()`, `PCHYPRESetBetaPoissonMatrix()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/hypre/hypre.c.html#PCHYPRESetAlphaPoissonMatrix">src/ksp/pc/impls/hypre/hypre.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ksp/pc/impls/hypre/hypre.c)


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