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# DMPlexIsInterpolated
Find out to what extent the `DMPLEX` is topologically interpolated. 
## Synopsis
```
#include "petscdmplex.h"   
PetscErrorCode DMPlexIsInterpolated(DM dm, DMPlexInterpolatedFlag *interpolated)
```
Not Collective


## Input Parameter

- ***dm      -*** The `DMPLEX` object



## Output Parameter

- ***interpolated -*** Flag whether the `DM` is interpolated





## Notes
Unlike `DMPlexIsInterpolatedCollective()`, this is NOT collective
so the results can be different on different ranks in special cases.
However, `DMPlexInterpolate()` guarantees the result is the same on all.

Unlike `DMPlexIsInterpolatedCollective()`, this cannot return `DMPLEX_INTERPOLATED_MIXED`.


## Developer Notes
Initially, plex->interpolated = `DMPLEX_INTERPOLATED_INVALID`.

If plex->interpolated == `DMPLEX_INTERPOLATED_INVALID`, `DMPlexIsInterpolated_Internal()` is called.
It checks the actual topology and sets plex->interpolated on each rank separately to one of
`DMPLEX_INTERPOLATED_NONE`, `DMPLEX_INTERPOLATED_PARTIAL` or `DMPLEX_INTERPOLATED_FULL`.

If plex->interpolated != `DMPLEX_INTERPOLATED_INVALID`, this function just returns plex->interpolated.

`DMPlexInterpolate()` sets plex->interpolated = `DMPLEX_INTERPOLATED_FULL`,
and DMPlexUninterpolate() sets plex->interpolated = `DMPLEX_INTERPOLATED_NONE`.


## See Also
 `DMPLEX`, `DMPlexInterpolate()`, `DMPlexIsInterpolatedCollective()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/plexinterpolate.c.html#DMPlexIsInterpolated">src/dm/impls/plex/plexinterpolate.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/plexinterpolate.c.html#DMPlexIsInterpolated_Internal">DMPlexIsInterpolated_Internal in src/dm/impls/plex/plexinterpolate.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/impls/plex/plexinterpolate.c)


[Index of all DMPlex routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)