petsc-3.10.5 2019-03-28

SNESGetFunction

Returns the vector where the function is stored.

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

Not Collective, but Vec is parallel if SNES is parallel. Collective if Vec is requested, but has not been created yet.

snes -the SNES context

	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); see SNESFunction for calling sequence details
	ctx	- the function context (or NULL if you don't want it)

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

SNES, nonlinear, get, function

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