slepc-main 2024-12-17
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 beta*f(alpha*x). 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
src/sys/classes/fn/interface/fnbasic.c
Examples
src/eps/tutorials/ex36.c
src/mfn/tutorials/ex23.c
src/mfn/tutorials/ex23f.F90
src/mfn/tutorials/ex37.c
src/mfn/tutorials/ex39.c
src/nep/tutorials/ex22.c
src/nep/tutorials/ex22f.F90
src/nep/tutorials/nlevp/gun.c
Index of all FN routines
Table of Contents for all manual pages
Index of all manual pages