def createFromDAG(self, depth, numPoints, coneSize, cones, coneOrientations, vertexCoords):
        cdef PetscInt  cdepth = asInt(depth)
        cdef const PetscInt *cnumPoints = NULL
        cdef const PetscInt *cconeSize = NULL
        cdef const PetscInt *ccones = NULL
        cdef const PetscInt *cconeOrientations = NULL
        cdef const PetscScalar *cvertexCoords = NULL
 
        cnumPoints = <const PetscInt *>     PyArray_DATA(numPoints)
        cconeSize = <const PetscInt *>     PyArray_DATA(coneSize)
        ccones = <const PetscInt *>     PyArray_DATA(cones)
        cconeOrientations = <const PetscInt *>     PyArray_DATA(coneOrientations)
        cvertexCoords = <const PetscScalar *>     PyArray_DATA(vertexCoords)
        CHKERR( DMPlexCreateFromDAG(self.dm, cdepth, cnumPoints, cconeSize, ccones, 
        cconeOrientations, cvertexCoords) )
        return self