Package org.ddogleg.optimization.derivative

Class NumericalDerivativeFB

java.lang.Object

org.ddogleg.optimization.derivative.NumericalDerivativeFB

All Implemented Interfaces:

FunctionStoS

public class NumericalDerivativeFB
extends Object
implements FunctionStoS

Finite difference numerical derivative calculation using the forward+backwards equation. Difference equation, f'(x) = (f(x+h)-f(x-h))/(2*h). Scaling is taken in account by h based upon the magnitude of the elements in variable x.

NOTE: If multiple input parameters are modified by the function when a single one is changed numerical derivatives aren't reliable.

Constructor Summary

Constructors

Constructor	Description
NumericalDerivativeFB(FunctionStoS function)
NumericalDerivativeFB(FunctionStoS function, double differenceScale)

Method Summary

Modifier and Type	Method	Description
double	process(double x)	Processes the input to compute an output.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

NumericalDerivativeFB

public NumericalDerivativeFB(FunctionStoS function,
 double differenceScale)

NumericalDerivativeFB

public NumericalDerivativeFB(FunctionStoS function)

Method Details

process

public double process(double x)

Description copied from interface: FunctionStoS

Processes the input to compute an output.

Specified by:

process in interface FunctionStoS

Parameters:

x - input parameter

Returns:

output value