//******************************************************************************
//
// File: ListXYSeries.java
// Package: edu.rit.numeric
// Unit: Class edu.rit.numeric.ListXYSeries
//
// 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.
//
// 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;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Scanner;
/**
* Class ListXYSeries provides a series of (x,y) pairs of real values
* (type double); the series is variable-length.
*
* @author Alan Kaminsky
* @version 22-Jul-2007
*/
public class ListXYSeries
extends XYSeries
implements Externalizable
{
// Hidden data members.
private static final long serialVersionUID = 3623908540262724935L;
private static final int INCR = 16;
private double[] xArray = new double [INCR];
private double[] yArray = new double [INCR];
private int myLength = 0;
// Exported constructors.
/**
* Construct a new zero-length XY series.
*/
public ListXYSeries()
{
}
// 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 i.
*
* @exception ArrayIndexOutOfBoundsException
* (unchecked exception) Thrown if i is not in the range
* 0 .. length()-1.
*/
public double x
(int i)
{
if (0 > i || i >= myLength)
{
throw new ArrayIndexOutOfBoundsException
("ListXYSeries.x(): Index = " + i + " out of bounds");
}
return xArray[i];
}
/**
* Returns the given Y value in this series.
*
* @param i Index.
*
* @return The Y value in this series at index i.
*
* @exception ArrayIndexOutOfBoundsException
* (unchecked exception) Thrown if i is not in the range
* 0 .. length()-1.
*/
public double y
(int i)
{
if (0 > i || i >= myLength)
{
throw new ArrayIndexOutOfBoundsException
("ListXYSeries.y(): Index = " + i + " out of bounds");
}
return yArray[i];
}
/**
* Clear this series.
*
* @return This series.
*/
public ListXYSeries clear()
{
myLength = 0;
return this;
}
/**
* Add the given data to this series.
*
* @param x X value.
* @param y Y value.
*
* @return This series.
*/
public ListXYSeries add
(double x,
double y)
{
allocate (1, INCR);
xArray[myLength] = x;
yArray[myLength] = y;
++ myLength;
return this;
}
/**
* Add the given data to this series. The data values are grouped into
* pairs, where the first data value is the X value and the second data
* value is the Y value. Each pair of data values is added to this series as
* though by the add(double,double) method. It is assumed that
* there are an even number of data values.
*
* @param data Data values.
*
* @return This series.
*/
public ListXYSeries add
(double... data)
{
int len = data.length / 2;
allocate (len, len);
for (int i = 0; i < len; ++ i)
{
xArray[myLength] = data[2*i];
yArray[myLength] = data[2*i+1];
++ myLength;
}
return this;
}
/**
* Add the given data arrays to this series. Each element of x and
* y is added to this series as though by the
* add(double,double) method. It is assumed that x and
* y are the same length.
*
* @param x Array of X values.
* @param y Array of Y values.
*
* @return This series.
*
* @exception NullPointerException
* (unchecked exception) Thrown if x or y is null.
*/
public ListXYSeries add
(double[] x,
double[] y)
{
return add (x, y, 0, x.length);
}
/**
* Add a portion of the given data arrays to this series. Each element of
* x and y from index off through index
* off+len-1 inclusive is added to this series as though by the
* add(double,double) method.
*
* @param x Array of X values.
* @param y Array of Y values.
* @param off Index of first element to add.
* @param len Number of elements to add.
*
* @return This series.
*
* @exception NullPointerException
* (unchecked exception) Thrown if x or y is null.
* @exception IndexOutOfBoundsException
* (unchecked exception) Thrown if off < 0, len
* < 0, off+len > x.length, or off+len
* > y.length.
*/
public ListXYSeries add
(double[] x,
double[] y,
int off,
int len)
{
if (off < 0 || len < 0 || off + len > x.length || off + len > y.length)
{
throw new IndexOutOfBoundsException();
}
allocate (len, len);
System.arraycopy (x, off, xArray, myLength, len);
System.arraycopy (y, off, yArray, myLength, len);
myLength += len;
return this;
}
/**
* Add the given {@linkplain XYSeries} to this series. Each corresponding X
* and Y value in the given X-Y series is added to this series as though by
* the add(double,double) method.
*
* @param theSeries X-Y series.
*
* @return This series.
*
* @exception NullPointerException
* (unchecked exception) Thrown if theSeries is null.
*/
public ListXYSeries add
(XYSeries theSeries)
{
return add (theSeries, 0, theSeries.length());
}
/**
* Add a portion of the given {@linkplain XYSeries} to this series. Each
* corresponding X and Y value in the given X-Y series from index
* off through index off+len-1 inclusive is added to this
* series as though by the add(double,double) method.
*
* @param theSeries X-Y series.
* @param off Index of first element to add.
* @param len Number of elements to add.
*
* @return This series.
*
* @exception NullPointerException
* (unchecked exception) Thrown if theSeries is null.
* @exception IndexOutOfBoundsException
* (unchecked exception) Thrown if off < 0, len
* < 0, or off+len > theSeries.length().
*/
public ListXYSeries add
(XYSeries theSeries,
int off,
int len)
{
if (off < 0 || len < 0 || off + len > theSeries.length())
{
throw new IndexOutOfBoundsException();
}
allocate (len, len);
while (len > 0)
{
xArray[myLength] = theSeries.x (off);
yArray[myLength] = theSeries.y (off);
++ myLength;
++ off;
-- len;
}
return this;
}
/**
* Add data read from the given scanner to this series. Double values are
* read from the scanner until there are no more. Each pair of consecutive
* double values is added to this series as though by the
* add(double,double) method. Any leftover double value is
* discarded. The add() method does not close the scanner
* when finished.
*
* To read data from a file, pass a scanner constructed on top of the file;
* to read data from an input stream, pass a scanner constructed on top of
* the input stream; and so on.
*
* @param scanner Scanner.
*
* @return This series.
*
* @exception NullPointerException
* (unchecked exception) Thrown if scanner is null.
*/
public ListXYSeries add
(Scanner scanner)
{
while (scanner.hasNextDouble())
{
double x = scanner.nextDouble();
if (scanner.hasNextDouble())
{
double y = scanner.nextDouble();
add (x, y);
}
}
return this;
}
/**
* Write this series to the given object output stream.
*
* @param out Object output stream.
*
* @exception IOException
* Thrown if an I/O error occurred.
*/
public void writeExternal
(ObjectOutput out)
throws IOException
{
int n = myLength;
out.writeInt (n);
for (int i = 0; i < n; ++ i)
{
out.writeDouble (xArray[i]);
out.writeDouble (yArray[i]);
}
}
/**
* Read this series from the given object input stream.
*
* @param in Object input stream.
*
* @exception IOException
* Thrown if an I/O error occurred.
*/
public void readExternal
(ObjectInput in)
throws IOException
{
int n = in.readInt();
xArray = new double [n];
yArray = new double [n];
myLength = n;
for (int i = 0; i < n; ++ i)
{
xArray[i] = in.readDouble();
yArray[i] = in.readDouble();
}
}
// Hidden operations.
/**
* Increase the storage allocation for this list XY series if necessary.
*
* @param len Number of items to be added.
* @param incr Amount to increase allocation.
*/
private void allocate
(int len,
int incr)
{
if (myLength + len > xArray.length)
{
double[] newxArray = new double [myLength + incr];
System.arraycopy (xArray, 0, newxArray, 0, myLength);
xArray = newxArray;
double[] newyArray = new double [myLength + incr];
System.arraycopy (yArray, 0, newyArray, 0, myLength);
yArray = newyArray;
}
}
}
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