PCMGGetRScale#

Gets the pointwise scaling for the restriction operator from level l to l-1.

Synopsis#

#include "petscksp.h" 
PetscErrorCode PCMGGetRScale(PC pc, PetscInt l, Vec *rscale)

Collective

Input Parameters#

  • pc - the multigrid context

  • rscale - the scaling

  • l - the level (0 is coarsest) to supply [Do not supply 0]

Note#

When evaluating a function on a coarse level one does not want to do F(R * x) one does F(rscale * R * x) where rscale is 1 over the row sums of R. It is preferable to use PCMGGetInjection() to control moving primal vectors.

See Also#

PCMG, PCMGSetInterpolation(), PCMGGetRestriction(), PCMGGetInjection()

Level#

advanced

Location#

src/ksp/pc/impls/mg/mgfunc.c


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Index of all PC routines
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Index of all manual pages