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#
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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