Package gaiasky.util.gaia.utils

Class RungeKuttaNs

java.lang.Object

gaiasky.util.gaia.utils.RungeKuttaNs

public class RungeKuttaNs
extends java.lang.Object

Provides an implementation of the Runge-Kutta method for solving single or sets of ordinary differential equations (ODEs).

A set of ODEs are supplied by means of the interface DiffnFunction.

This class is taken from the Java library developed by Michael Thomas Flanagan available at http://www.ee.ucl.ac.uk/~mflanaga/java/RungeKutta.html

NOTE: This is for RSLS use only - do not use in any other software

Constructor Summary

Constructors

Constructor	Description
RungeKuttaNs()

Method Summary

Modifier and Type	Method	Description
static double[]	fourthOrder(DiffnFunctionNs g, long tOld, double[] y0, long tNew, long tStepMax, long tUnit)	Returns the value of y at a given value of x (xn) for a set of ordinary differential equation (ODEs) See http://www.ee.ucl.ac.uk/~mflanaga/java/RungeKutta.html#four

Methods inherited from class java.lang.Object

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

Constructor Detail

RungeKuttaNs

public RungeKuttaNs()

Method Detail

fourthOrder

public static double[] fourthOrder(DiffnFunctionNs g,
                                   long tOld,
                                   double[] y0,
                                   long tNew,
                                   long tStepMax,
                                   long tUnit)

Returns the value of y at a given value of x (xn) for a set of ordinary differential equation (ODEs)
See http://www.ee.ucl.ac.uk/~mflanaga/java/RungeKutta.html#four

Parameters:

g - an implementation of DiffnFunction describing a set of Ordinary Differential Equations

tOld - the initial value for t

y0 - the initial value for y

tNew - the value of t where we want to know y

tStepMax - the initial step size

tUnit - the time unit used for the derivatives

Returns:

the value of y at xn