:orphan:
# PCGAMGCreateGraph
Creates a graph that is used by the ``PCGAMGType`` in the coarsening process
## Synopsis
```
#include "petscpc.h"
#include "petscksp.h"
PetscErrorCode PCGAMGCreateGraph(PC pc, Mat A, Mat *G)
```
## Input Parameters
- ***pc -*** the `PCGAMG`
- ***A -*** the matrix, for any level
## Output Parameter
- ***G -*** the graph
## See Also
`PCGAMGType`, `PCGAMG`, `PCGAMGSetType()`
## Level
advanced
## Location
src/ksp/pc/impls/gamg/gamg.c
## Implementations
PCGAMGCreateGraph_AGG in src/ksp/pc/impls/gamg/agg.c
PCGAMGCreateGraph_Classical in src/ksp/pc/impls/gamg/classical.c
PCGAMGCreateGraph_GEO in src/ksp/pc/impls/gamg/geo.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ksp/pc/impls/gamg/gamg.c)
[Index of all PC routines](index.md)
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