DMCreateInterpolation#

Gets the interpolation matrix between two DM objects. The resulting matrix map degrees of freedom in the vector obtained by DMCreateGlobalVector() on the coarse DM to similar vectors on the fine grid DM.

Synopsis#

#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMCreateInterpolation(DM dmc, DM dmf, Mat *mat, Vec *vec)

Collective on dmc

Input Parameters#

  • dmc - the DM object

  • dmf - the second, finer DM object

Output Parameters#

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.

For DMDA objects you can use this interpolation (more precisely the interpolation from the DMGetCoordinateDM()) to interpolate the mesh coordinate vectors EXCEPT in the periodic case where it does not make sense since the coordinate vectors are not periodic.

See Also#

DMDestroy(), DMView(), DMCreateGlobalVector(), DMCreateColoring(), DMCreateMatrix(), DMCreateMassMatrix(), DMRefine(), DMCoarsen(), DMCreateRestriction(), DMCreateInterpolationScale()

Level#

developer

Location#

src/dm/interface/dm.c

Examples#

src/dm/impls/stag/tutorials/ex4.c.html
src/dm/tutorials/ex3.c.html
src/ksp/ksp/tutorials/ex35.cxx.html
src/ksp/ksp/tutorials/ex36.cxx.html
src/ksp/ksp/tutorials/ex42.c.html
src/ksp/ksp/tutorials/ex65.c.html
src/ksp/ksp/tutorials/ex73.c.html
src/snes/tutorials/ex36.c.html
src/snes/tutorials/ex48.c.html
src/ts/tutorials/ex29.c.html

Implementations#

DMCreateInterpolation_Composite in src/dm/impls/composite/pack.c
DMCreateInterpolation_DA in src/dm/impls/da/dainterp.c
DMCreateInterpolation_pforest in src/dm/impls/forest/p4est/pforest.h
DMCreateInterpolation_Moab in src/dm/impls/moab/dmmbmg.cxx
DMCreateInterpolation_Plex in src/dm/impls/plex/plex.c
DMCreateInterpolation_Redundant in src/dm/impls/redundant/dmredundant.c
DMCreateInterpolation_Stag in src/dm/impls/stag/stag.c
DMCreateInterpolation_SNESVI in src/snes/impls/vi/rs/virs.c


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Index of all manual pages