petsc-3.14.5 2021-03-03
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# SNESFASGalerkinFunctionDefault

Computes the Galerkin FAS function

### Synopsis

    #include "petscsnes.h"
    PetscErrorCode SNESFASGalerkinFunctionDefault(SNES snes, Vec X, Vec F, void *ctx)

### Input Parameters

| snes | - the nonlinear solver context
| X | - input vector
| ctx | - the FAS context

### Output Parameter

| F | - output vector

### Notes

The Galerkin FAS function evalutation is defined as

     F^l(x^l) = I^l_0 F^0(P^0_l x^l)

### See Also

SNESFASGetGalerkin(), SNESFASSetGalerkin()

### Level

developer

### Location

src/snes/impls/fas/fasgalerkin.c
Index of all SNESFAS routines
Table of Contents for all manual pages
Index of all manual pages