hep.aida.ref.pdf
Class FunctionDerivative

java.lang.Object
  hep.aida.ref.pdf.FunctionDerivative

public abstract class FunctionDerivative

extends Object

Author:

The FreeHEP team @ SLAC

Source Code:

FunctionDerivative.java

Constructor Summary

FunctionDerivative()

Method Summary

static double

derivative(Function f, Variable x, double h) Computes the derivative of a function with respect to one argument.

Methods inherited from class java.lang.Object

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

Constructor Detail

FunctionDerivative

public FunctionDerivative()

Method Detail

derivative

public static double derivative(Function f,
                                Variable x,
                                double h)

Computes the derivative of a function with respect to one argument. Adapted from Numerical Recipes in FORTRAN dfridr, pp. 182-183.

Parameters:

f - a JAIDA IFunction

x - a double[] with the point where the derivative is evaluated

h - a typical step size for x[ind]

Returns:

the value of df/dx[ind] at x[]