petsc3.14.4 20210203
PCMGSetInterpolation
Sets the function to be used to calculate the interpolation from l1 to the lth level
Synopsis
#include "petscksp.h"
PetscErrorCode PCMGSetInterpolation(PC pc,PetscInt l,Mat mat)
Logically Collective on PC
Input Parameters
 pc   the multigrid context

 mat   the interpolation operator

 l   the level (0 is coarsest) to supply [do not supply 0]

Notes
Usually this is the same matrix used also to set the restriction
for the same level.
One can pass in the interpolation matrix or its transpose; PETSc figures
out from the matrix size which one it is.
See Also
PCMGSetRestriction()
Level
advanced
Location
src/ksp/pc/impls/mg/mgfunc.c
Examples
src/ksp/ksp/tutorials/ex42.c.html
Index of all PC routines
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Index of all manual pages