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.units;
samer@0: import  samer.core.*;
samer@0: import  samer.maths.*;
samer@0: import  samer.tools.*;
samer@0: 
samer@0: /*
samer@0:  *		Takes successive input vectors and stacks them into
samer@0:  *		one big output vector. This version only stacks one
samer@0:  *		at new vector at a time and therefore does not need a
samer@0:  *		sub task to run to get new vectors.
samer@0:  */
samer@0: 
samer@0: public class Stacker2 extends NullTask
samer@0: {
samer@0: 	Node	node;
samer@0: 	Vec	srcvec;
samer@0: 	VVector	target;
samer@0: 	double []	a;
samer@0: 	int	k0, k1, k2;
samer@0: 
samer@0: 	public Stacker2(Vec v, int size) { this(v,size,v.size()); }
samer@0: 	public Stacker2(Vec v, int size, int height)
samer@0: 	{
samer@0: 		node = new Node("stacker");
samer@0: 
samer@0: 		Shell.push(node);
samer@0: 		srcvec=v; 
samer@0: 
samer@0: 		k0=height;
samer@0: 		k1=k0;
samer@0: 		k2=(size-1)*k0;
samer@0: 
samer@0: 		target = new VVector("output",k0*size);
samer@0: 		a = target.array();
samer@0: 		Mathx.zero(a);
samer@0: 
samer@0: 		Shell.pop();
samer@0: 	}
samer@0: 
samer@0: 	public void dispose() { target.dispose(); }
samer@0: 	public VVector output() { return target; }
samer@0: 
samer@0: 	public void run() {
samer@0: 		System.arraycopy(a,k1,a,0,k2); // make some room 
samer@0: 		System.arraycopy(srcvec.array(),0,a,k2,k0); // copy new data in
samer@0: 		target.changed();
samer@0: 	}
samer@0: }