FNSetScale#
Sets the scaling parameters that define the matematical function.
Synopsis#
#include "slepcfn.h"
PetscErrorCode FNSetScale(FN fn,PetscScalar alpha,PetscScalar beta)
Logically Collective
Input Parameters#
fn - the math function context
alpha - inner scaling (argument)
beta - outer scaling (result)
Notes#
Given a function f(x) specified by the FN type, the scaling parameters can be used to realize the function betaf(alphax). So when these values are given, the procedure for function evaluation will first multiply the argument by alpha, then evaluate the function itself, and finally scale the result by beta. Likewise, these values are also considered when evaluating the derivative.
If you want to provide only one of the two scaling factors, set the other one to 1.0.
See Also#
FNGetScale(), FNEvaluateFunction()
Level#
intermediate
Location#
Examples#
src/mfn/tutorials/ex39.c
src/eps/tutorials/ex36.c
src/mfn/tutorials/ex23.c
src/mfn/tutorials/ex37.c
src/nep/tutorials/ex22f.F90
src/nep/tutorials/ex22.c
src/mfn/tutorials/ex23f.F90
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