:orphan:
# DMPlexCreateFromDAG
This takes as input the adjacency-list representation of the Directed Acyclic Graph (Hasse Diagram) encoding a mesh, and produces a `DM` 
## Synopsis
```
#include "petscdmplex.h"   
#include "petscdmplex.h"   
PetscErrorCode DMPlexCreateFromDAG(DM dm, PetscInt depth, const PetscInt numPoints[], const PetscInt coneSize[], const PetscInt cones[], const PetscInt coneOrientations[], const PetscScalar vertexCoords[])
```

## Input Parameters

- ***dm -*** The empty `DM` object, usually from `DMCreate()` and `DMSetDimension()`
- ***depth -*** The depth of the DAG
- ***numPoints -*** Array of size depth + 1 containing the number of points at each `depth`
- ***coneSize -*** The cone size of each point
- ***cones -*** The concatenation of the cone points for each point, the cone list must be oriented correctly for each point
- ***coneOrientations -*** The orientation of each cone point
- ***vertexCoords -*** An array of `numPoints`[0]*spacedim numbers representing the coordinates of each vertex, with spacedim the value set via `DMSetCoordinateDim()`



## Output Parameter

- ***dm -*** The `DM`





## Note
Two triangles sharing a face would have input
```none
  depth = 1, numPoints = [4 2], coneSize = [3 3 0 0 0 0]
  cones = [2 3 4  3 5 4], coneOrientations = [0 0 0  0 0 0]
 vertexCoords = [-1.0 0.0  0.0 -1.0  0.0 1.0  1.0 0.0]
```

which would result in the DMPlex
```none
        4
      / | \
     /  |  \
    /   |   \
   2  0 | 1  5
    \   |   /
     \  |  /
      \ | /
        3
```

Notice that all points are numbered consecutively, unlike `DMPlexCreateFromCellListPetsc()`


## See Also
 [](ch_unstructured), `DM`, `DMPLEX`, `DMPlexCreateFromCellListPetsc()`, `DMPlexCreate()`

## Level
advanced

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

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/tutorials/ex3f90.F90.html">src/dm/impls/plex/tutorials/ex3f90.F90</A><BR>


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