01 package uk.ac.ed.ph.advcompsim.part3.closure;

24 public interface Closure {
25     
26     /**
27      * <code>function</code> is a real-valued function of a real variable.
28      * 
29      * @param x The argument for the function
30      * @return The value of <code>function(x)</code> of the function
31      *    <code>function</code> applied to the argument <code>x</code>.
32      */
33     float function(float x);
34 }

This bit I understand, which means in my class I need to define "function()" - thus...

import java.io.*;
import java.math.*;
import uk.ac.ed.ph.advcompsim.part3.closure.*;


public class exc318 implements Closure {

	public static void main (String args[]) {
		Closed datasample2;							// The data array
	}

	public float function(float x) {
		float f = (float) (Math.pow((double) x, (double)-1/4));			// Math.pow - for the programming language that lost the ^ :(
		return f;
	}

}