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//******************************************************************************
//
// File: SampledXYSeries.java
// Package: edu.rit.numeric
// Unit: Class edu.rit.numeric.SampledXYSeries
//
// This Java source file is copyright (C) 2007 by Alan Kaminsky. All rights
// reserved. For further information, contact the author, Alan Kaminsky, at
// ark@cs.rit.edu.
//
// This Java source file is part of the Parallel Java Library ("PJ"). PJ is free
// software; you can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// PJ is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// Linking this library statically or dynamically with other modules is making a
// combined work based on this library. Thus, the terms and conditions of the
// GNU General Public License cover the whole combination.
//
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent modules, and
// to copy and distribute the resulting executable under terms of your choice,
// provided that you also meet, for each linked independent module, the terms
// and conditions of the license of that module. An independent module is a
// module which is not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the library, but
// you are not obligated to do so. If you do not wish to do so, delete this
// exception statement from your version.
//
// A copy of the GNU General Public License is provided in the file gpl.txt. You
// may also obtain a copy of the GNU General Public License on the World Wide
// Web at http://www.gnu.org/licenses/gpl.html.
//
//******************************************************************************
package edu.rit.numeric;
/**
* Class SampledXYSeries provides a series of (<I>x,y</I>) pairs of real values
* (type <TT>double</TT>) where the Y values are computed by sampling a
* {@linkplain Function} for a series of X values.
* <P>
* Class SampledXYSeries is implemented to minimize space rather than time. Each
* time <TT>x()</TT> is called, the <I>x</I> value is computed anew. Each time
* <TT>y()</TT> is called, the <I>x</I> value is computed anew, then the
* <I>y</I> value is computed anew by evaluating the function at <I>x</I>.
*
* @author Alan Kaminsky
* @version 06-Jul-2007
*/
public class SampledXYSeries
extends XYSeries
{
// Hidden data members.
private Function myFunction;
private double myXinit;
private double myDelta;
private int myLength;
// Exported constructors.
/**
* Construct a new sampled series sampling values of the given function. The
* <I>y</I> values at indexes 0, 1, 2, ... <TT>len-1</TT> are computed by
* evaluating <TT>theFunction</TT> at the <I>x</I> values <TT>xinit</TT>,
* <TT>xinit+delta</TT>, <TT>xinit+2*delta</TT>, ...
* <TT>xinit+(len-1)*delta</TT>.
*
* @param theFunction Function to sample.
* @param xinit Initial <I>x</I> value.
* @param delta Difference between successive <I>x</I> values.
* @param len Length (number of (<I>x,y</I>) pairs).
*
* @exception NullPointerException
* (unchecked exception) Thrown if <TT>theFunction</TT> is null.
* @exception IllegalArgumentException
* (unchecked exception) Thrown if <TT>len</TT> is less than 0.
*/
public SampledXYSeries
(Function theFunction,
double xinit,
double delta,
int len)
{
super();
if (theFunction == null)
{
throw new NullPointerException
("SampledXYSeries(): theFunction is null");
}
if (len < 0)
{
throw new IllegalArgumentException
("SampledXYSeries(): len = " + len + " illegal");
}
myFunction = theFunction;
myXinit = xinit;
myDelta = delta;
myLength = len;
}
// Exported operations.
/**
* Returns the number of values in this series.
*
* @return Length.
*/
public int length()
{
return myLength;
}
/**
* Returns the given X value in this series.
*
* @param i Index.
*
* @return The X value in this series at index <TT>i</TT>.
*
* @exception ArrayIndexOutOfBoundsException
* (unchecked exception) Thrown if <TT>i</TT> is not in the range
* <TT>0</TT> .. <TT>length()-1</TT>.
*/
public double x
(int i)
{
return myXinit + i * myDelta;
}
/**
* Returns the given Y value in this series.
*
* @param i Index.
*
* @return The Y value in this series at index <TT>i</TT>.
*
* @exception ArrayIndexOutOfBoundsException
* (unchecked exception) Thrown if <TT>i</TT> is not in the range
* <TT>0</TT> .. <TT>length()-1</TT>.
*/
public double y
(int i)
{
return myFunction.f (x (i));
}
}
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