gnuplotoperator.java

一个很好的LIBSVM的JAVA源码。对于要研究和改进SVM算法的学者。可以参考。来自数据挖掘工具YALE工具包。

/*
 *  YALE - Yet Another Learning Environment
 *  Copyright (C) 2001-2004
 *      Simon Fischer, Ralf Klinkenberg, Ingo Mierswa, 
 *          Katharina Morik, Oliver Ritthoff
 *      Artificial Intelligence Unit
 *      Computer Science Department
 *      University of Dortmund
 *      44221 Dortmund,  Germany
 *  email: [e-mail]
 *  web:   http://yale.cs.uni-dortmund.de/
 *
 *  This program 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 2 of the
 *  License, or (at your option) any later version. 
 *
 *  This program 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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 *  USA.
 */
package edu.udo.cs.yale.operator.io;

import edu.udo.cs.yale.operator.Operator;
import edu.udo.cs.yale.operator.IOObject;
import edu.udo.cs.yale.operator.OperatorException;
import edu.udo.cs.yale.operator.UserError;
import edu.udo.cs.yale.Statistics;
import edu.udo.cs.yale.operator.parameter.*;
import edu.udo.cs.yale.tools.LogService;

import java.util.List;
import java.io.*;

/** Writes the data generated by a {@link edu.udo.cs.yale.operator.ExperimentLogOperator} to a file in gnuplot
 *  format to a file. 
 *  The property <code>yale.tools.gnuplot.command</code> should be set to the complete
 *  path of the gnuplot executable, though this is not necessary, since gnuplot is not
 *  invoked.
 *
 *  @version $Id: GNUPlotOperator.java,v 1.3 2004/08/27 11:57:37 ingomierswa Exp $
 */
public class GNUPlotOperator extends Operator {

    public Class[] getInputClasses() { return new Class[0]; }
    public Class[] getOutputClasses() { return new Class[0]; }

    public IOObject[] apply() throws OperatorException {
	String statisticsName = getParameterAsString("name");
	if (!getExperiment().statisticsExist(statisticsName)) {
	    LogService.logMessage("Statistics with name '" + statisticsName + "' does not exist.", 
				  LogService.ERROR);
	    return new IOObject[0];
	}

	Statistics statistics = getExperiment().getStatistics(statisticsName);
	String[] valueNames = getParameterAsString("values").split(" ");
	int[] values = new int[valueNames.length];
	for (int i = 0; i < values.length; i++) {
	    values[i] = statistics.getColumnIndex(valueNames[i]);
	    if (values[i] == -1) {
		LogService.logMessage(getName()+": No data column with name '" + valueNames[i] + "' exists.", 
				      LogService.ERROR);
		return new IOObject[0];
	    }
	}

	String xAxisName = getParameterAsString("x_axis");
	int xAxis = statistics.getColumnIndex(xAxisName);
	if (xAxis == -1) {
	    LogService.logMessage("No data column with name '" + xAxisName + "' exists.", LogService.ERROR);
	    return new IOObject[0];
	}
	String yAxisName = getParameterAsString("y_axis");
	int yAxis = -1;
	if (yAxisName != null) {
	    yAxis = statistics.getColumnIndex(yAxisName);
	    if (yAxis == -1) {
		LogService.logMessage("No data column with name '" + yAxisName + "' exists.", LogService.ERROR);
		return new IOObject[0];
	    }
	}

	String additional = "";
	if (isParameterSet("title")) additional += "set title \""+getParameterAsString("title")+"\"\n";
	if (isParameterSet("additional_parameters"))
	    additional += getParameterAsString("additional_parameters");

	try {
	    File file = getExperiment().createFile(getParameterAsString("output_file"));
	    LogService.logMessage("Creating gnuplot file '"+file+"'", LogService.MINIMUM);
	    PrintStream out = new PrintStream(new FileOutputStream(file)); 
	    statistics.writeGNUPlot(out, xAxis, yAxis, values, "linespoints", additional, null);
	    out.close();
	} catch (IOException e) {
	    LogService.logMessage("Cannot create output file: " + e.getMessage(), LogService.ERROR);
	    return new IOObject[0];
	}
	return new IOObject[0];
    }

    public List getParameterTypes() {
	List types = super.getParameterTypes();
	types.add(new ParameterTypeFile("output_file", "The gnuplot file.", false));
	types.add(new ParameterTypeString("name", "The name of the experiment log operator which produced the statistics.", false));
	types.add(new ParameterTypeString("title", "The title of the plot.", "Created by Yale"));
	types.add(new ParameterTypeString("x_axis", "The values of the x-axis.", false));
	ParameterType type = new ParameterTypeString("y_axis", "The values of the y-axis (for 3d plots).", true);
	type.setExpert(false);
	types.add(type);
	types.add(new ParameterTypeString("values", "A whitespace separated list of values which should be plotted.", false));
	types.add(new ParameterTypeString("additional_parameters", "Additional parameters for the gnuplot header.", true));
	return types;
    }
}