SNESGetFunction#

Returns the function that defines the nonlinear system set with SNESSetFunction()

Synopsis#

#include "petscsnes.h"  
PetscErrorCode SNESGetFunction(SNES snes, Vec *r, PetscErrorCode (**f)(SNES, Vec, Vec, void *), void **ctx)

Not Collective, but r is parallel if snes is parallel. Collective if r is requested, but has not been created yet.

Input Parameter#

  • snes - the SNES context

Output Parameters#

  • r - the vector that is used to store residuals (or NULL if you don’t want it)

  • f - the function (or NULL if you don’t want it); for calling sequence see SNESFunction

  • ctx - the function context (or NULL if you don’t want it)

Note#

The vector r DOES NOT, in general, contain the current value of the SNES nonlinear function

See Also#

SNES: Nonlinear Solvers, SNES, SNESSolve(), SNESSetFunction(), SNESGetSolution(), SNESFunction`

Level#

advanced

Location#

src/snes/interface/snes.c

Examples#

src/snes/tutorials/ex1.c
src/snes/tutorials/ex12.c
src/snes/tutorials/ex21.c
src/snes/tutorials/ex22.c
src/snes/tutorials/ex30.c
src/snes/tutorials/ex5f.F90
src/ts/tutorials/ex48.c

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Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages