samer@0: /*
samer@0:  *	Vec.java	
samer@0:  *
samer@0:  *	Copyright (c) 2000, Samer Abdallah, King's College London.
samer@0:  *	All rights reserved.
samer@0:  *
samer@0:  *	This software is provided AS iS and WITHOUT ANY WARRANTY; 
samer@0:  *	without even the implied warranty of MERCHANTABILITY or 
samer@0:  *	FITNESS FOR A PARTICULAR PURPOSE.
samer@0:  */
samer@0: 
samer@0: package samer.maths;
samer@0: 
samer@0: /**
samer@0: 	Interface for a vector that can be access via either
samer@0: 	an iterator (read only), or a double array (read/write)
samer@0: 	or via a Mat interface.
samer@0:   */
samer@0: 
samer@0: public interface Vec 
samer@0: {
samer@0: 	int			size();
samer@0: 	Iterator	iterator(); 
samer@0: 	double[]	array();				
samer@0: 	Mat			mat();
samer@0: 
samer@0: 	/** access vector by iterator */
samer@0: 	public interface Iterator {
samer@0: 		boolean	more();
samer@0: 		double	next();
samer@0: 	}
samer@0: 
samer@0: 	public interface InputIterator {
samer@0: 		boolean	more();
samer@0: 		void    next(double t);
samer@0: 	}
samer@0: 
samer@0: 	/**
samer@0: 		An implementation of Vec that uses an array to
samer@0: 		store the values.
samer@0: 	  */
samer@0: 
samer@0: 	public static class ForArray implements Vec, Mat, java.io.Serializable
samer@0: 	{
samer@0: 		double []	x;
samer@0: 		public ForArray( double[] a) { x=a; }
samer@0: 		public ForArray( int n) { x=new double[n]; }
samer@0: 
samer@0: 		public int size() { return x.length; }
samer@0: 		public double[] array() { return x; }
samer@0: 		public Vec.Iterator iterator() { return new Iterator(); }
samer@0: 		public Mat mat() { return this; }
samer@0: 		public int width() { return size(); }
samer@0: 		public int height() { return 1; }
samer@0: 		public double get( int i, int j) { return x[j]; }
samer@0: 		public void	  set( int i, int j, double t) { x[j]=t; }
samer@0: 
samer@0: 		class Iterator implements Vec.Iterator {
samer@0: 			int			i=0;
samer@0: 			
samer@0: 			public boolean more() { return i<x.length; }
samer@0: 			public double  next() { return x[i++]; }
samer@0: 		};
samer@0: 		
samer@0: 		class InputIterator implements Vec.InputIterator {
samer@0: 			int			i=0;
samer@0: 			
samer@0: 			public boolean more() { return i<x.length; }
samer@0: 			public void    next(double t) { x[i++]=t; }
samer@0: 		};
samer@0: 	}
samer@0: }
samer@0: