petsc-3.14.6 2021-03-30
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DMCreateRestriction

 Gets restriction matrix between two DM objects

Synopsis

#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode  DMCreateRestriction(DM dmc,DM dmf,Mat *mat)
Collective on dmc

Input Parameter

dmc - the DM object
dmf - the second, finer DM object

Output Parameter

mat - the restriction

Notes

For DMDA objects this only works for "uniform refinement", that is the refined mesh was obtained DMRefine() or the coarse mesh was obtained by DMCoarsen(). The coordinates set into the DMDA are completely ignored in computing the interpolation.

See Also

DMDestroy(), DMView(), DMCreateGlobalVector(), DMCreateColoring(), DMCreateMatrix(), DMRefine(), DMCoarsen(), DMCreateInterpolation()

Level

developer

Location

src/dm/interface/dm.c
Index of all DM routines
Table of Contents for all manual pages
Index of all manual pages