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//******************************************************************************
//
// File: PlotData.java
// Package: edu.rit.mri.test
// Unit: Class edu.rit.mri.test.PlotData
//
// This Java source file is copyright (C) 2008 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.mri.test;
import edu.rit.numeric.ListXYSeries;
import edu.rit.numeric.plot.Dots;
import edu.rit.numeric.plot.Plot;
import edu.rit.numeric.plot.Strokes;
import java.awt.Color;
import java.io.File;
import java.util.Scanner;
/**
* Class PlotData is a main program that displays a plot of a spin signal data
* set. The data set is generated by the {@linkplain GenData} program. A
* noise-free spin signal derived from the given spin densities and spin
* relaxation rates is superimposed on the plot.
* <P>
* Usage: java edu.rit.mri.test.PlotData <I>datafile</I> [
* <I>ρ</I><SUB>1</SUB> <I>x</I><SUB>1</SUB> . . . ]
* <BR><I>datafile</I> = File containing <I>t</I> and <I>S</I>(<I>t</I>) values
* <BR><I>rho</I><SUB>1</SUB> = Spin density
* <BR><I>x</I><SUB>1</SUB> = Spin relaxation rate
*
* @author Alan Kaminsky
* @version 10-Jun-2008
*/
public class PlotData
{
// Prevent construction.
private PlotData()
{
}
// Main program.
/**
* Main program.
*/
public static void main
(String[] args)
throws Exception
{
// Parse command line arguments.
if (args.length < 1 || (args.length % 2) != 1) usage();
File datafile = new File (args[0]);
int ns = (args.length - 1)/2;
double[] rho = new double [ns];
double[] x = new double [ns];
for (int i = 0; i < ns; ++ i)
{
rho[i] = Double.parseDouble (args[2*i+1]);
x[i] = Double.parseDouble (args[2*i+2]);
}
// Get data X-Y series.
ListXYSeries dataseries = new ListXYSeries();
dataseries.add (new Scanner (datafile));
// Create plot with data X-Y series.
Plot plot = new Plot();
plot.xAxisLength (1200)
.xAxisMajorDivisions (20)
.yAxisLength (600)
.yAxisMajorDivisions (10)
.seriesDots (Dots.circle (Color.BLACK, null, null, 5))
.seriesColor (Color.BLACK)
.seriesStroke (Strokes.solid (2))
.xySeries (dataseries);
// If specified, generate spin signal X-Y series and add to plot.
if (ns > 0)
{
double chisqr = 0.0;
ListXYSeries signalseries = new ListXYSeries();
for (int i = 0; i < dataseries.length(); ++ i)
{
double t = dataseries.x(i);
double s = 0.0;
for (int j = 0; j < ns; ++ j)
{
s += rho[j]*(1.0 - 2.0*Math.exp(-x[j]*t));
}
double d = s - dataseries.y(i);
chisqr += d*d;
signalseries.add (t, s);
}
System.out.println ("chi^2 = "+chisqr);
plot.seriesDots (null)
.seriesColor (Color.RED)
.seriesStroke (Strokes.solid (1))
.xySeries (signalseries);
}
// Display plot.
plot.getFrame().setVisible (true);
}
// Hidden operations.
/**
* Print a usage message and exit.
*/
private static void usage()
{
System.err.println ("Usage: java edu.rit.mri.test.PlotData <datafile> [<rho1> <x1> ...]");
System.err.println ("<datafile> = File containing t and S(t) values");
System.err.println ("<rho1> = Spin density");
System.err.println ("<x1> = Spin relaxation rate");
System.exit (1);
}
}
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