FNEvaluateFunction#

Computes the value of the function \(f(x)\) for a given \(x\).

Synopsis#

#include "slepcfn.h" 
PetscErrorCode FNEvaluateFunction(FN fn,PetscScalar x,PetscScalar *y)

Not Collective

Input Parameters#

  • fn - the math function context

  • x - the value where the function must be evaluated

Output Parameter#

  • y - the result of \(f(x)\)

Note#

Scaling factors are taken into account, so the actual function evaluation will return \(\beta f(\alpha x)\).

See Also#

FN: Mathematical Functions, FNEvaluateDerivative(), FNEvaluateFunctionMat(), FNSetScale()

Level#

intermediate

Location#

src/sys/classes/fn/interface/fnbasic.c

Examples#

src/sys/classes/ds/tests/test12.c
src/sys/classes/ds/tests/test23.c
src/sys/classes/ds/tests/test25.c
src/sys/classes/fn/tests/test1.c
src/sys/classes/fn/tests/test10.c
src/sys/classes/fn/tests/test11.c
src/sys/classes/fn/tests/test1f.F90
src/sys/classes/fn/tests/test2.c
src/sys/classes/fn/tests/test6.c
src/sys/classes/fn/tests/test7f.F90

Implementations#

FNEvaluateFunction_Combine() in src/sys/classes/fn/impls/combine/fncombine.c
FNEvaluateFunction_Exp() in src/sys/classes/fn/impls/exp/fnexp.c
FNEvaluateFunction_Invsqrt() in src/sys/classes/fn/impls/invsqrt/fninvsqrt.c
FNEvaluateFunction_Log() in src/sys/classes/fn/impls/log/fnlog.c
FNEvaluateFunction_Phi() in src/sys/classes/fn/impls/phi/fnphi.c
FNEvaluateFunction_Rational() in src/sys/classes/fn/impls/rational/fnrational.c
FNEvaluateFunction_Sqrt() in src/sys/classes/fn/impls/sqrt/fnsqrt.c

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