RungeKuttaNs

java.lang.Object

gaiasky.util.gaia.utils.RungeKuttaNs

public class RungeKuttaNs extends 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)

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details
- RungeKuttaNs
  
  public RungeKuttaNs()
Method Details
- 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