SNESSetInitialFunction#

Sets the function vector to be used as the initial function value at the initialization of the method. In some instances, the user has precomputed the function before calling SNESSolve(). This function allows one to avoid a redundant call to SNESComputeFunction() in that case.

Synopsis#

#include "petscsnes.h"  
PetscErrorCode SNESSetInitialFunction(SNES snes, Vec f)

Logically Collective

Input Parameters#

  • snes - the SNES context

  • f - vector to store function value

Notes#

This should not be modified during the solution procedure.

This is used extensively in the SNESFAS hierarchy and in nonlinear preconditioning.

See Also#

SNES: Nonlinear Solvers, SNES, SNESFAS, SNESSetFunction(), SNESComputeFunction(), SNESSetInitialFunctionNorm()

Level#

developer

Location#

src/snes/interface/snes.c

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Index of all SNES routines
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Index of all manual pages