FNEvaluateDerivative#

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

Synopsis#

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

Not Collective

Input Parameters#

  • fn - the math function context

  • x - the value where the derivative must be evaluated

Output Parameter#

  • y - the result of \(f'(x)\)

Note#

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

See Also#

FN: Mathematical Functions, FNEvaluateFunction(), FNSetScale()

Level#

intermediate

Location#

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

Examples#

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
src/sys/classes/fn/tests/test8.c
src/sys/classes/fn/tests/test9.c

Implementations#

FNEvaluateDerivative_Combine() in src/sys/classes/fn/impls/combine/fncombine.c
FNEvaluateDerivative_Exp() in src/sys/classes/fn/impls/exp/fnexp.c
FNEvaluateDerivative_Invsqrt() in src/sys/classes/fn/impls/invsqrt/fninvsqrt.c
FNEvaluateDerivative_Log() in src/sys/classes/fn/impls/log/fnlog.c
FNEvaluateDerivative_Phi() in src/sys/classes/fn/impls/phi/fnphi.c
FNEvaluateDerivative_Rational() in src/sys/classes/fn/impls/rational/fnrational.c
FNEvaluateDerivative_Sqrt() in src/sys/classes/fn/impls/sqrt/fnsqrt.c

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