petsc-3.7.7 2017-09-25
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# SNESFASSetInterpolation

Sets the function to be used to calculate the interpolation from l-1 to the lth level

### Synopsis

    #include "petscsnes.h"
    PetscErrorCode SNESFASSetInterpolation(SNES snes, PetscInt level, Mat mat)

### Input Parameters

| snes | - the multigrid context
| mat | - the interpolation operator
| level | - 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.

### Keywords

FAS, multigrid, set, interpolate, level

### See Also

SNESFASSetInjection(), SNESFASSetRestriction(), SNESFASSetRScale()

Level:advanced
Location:src/snes/impls/fas/fasfunc.c
Index of all SNES routines
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Index of all manual pages