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# PCHYPRESetEdgeConstantVectors
Set the representation of the constant vector fields in the edge element basis for `PCHYPRE` of type ams
## Synopsis
```
#include "petscpc.h"
PetscErrorCode PCHYPRESetEdgeConstantVectors(PC pc, Vec ozz, Vec zoz, Vec zzo)
```
Collective
## Input Parameters
- ***pc -*** the preconditioning context
- ***ozz -*** vector representing (1,0,0) (or (1,0) in 2D)
- ***zoz -*** vector representing (0,1,0) (or (0,1) in 2D)
- ***zzo -*** vector representing (0,0,1) (use NULL in 2D)
## Developer Note
If this is only for `PCHYPRE` type of ams it should be called `PCHYPREAMSSetEdgeConstantVectors()`
## See Also
`PCHYPRE`, `PCHYPRESetDiscreteGradient()`, `PCHYPRESetDiscreteCurl()`, `PCHYPRESetAlphaPoissonMatrix()`
## Level
intermediate
## Location
src/ksp/pc/impls/hypre/hypre.c
## Implementations
PCHYPRESetEdgeConstantVectors_HYPRE in src/ksp/pc/impls/hypre/hypre.c
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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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