mexicanhat.java

代码是一个分类器的实现,其中使用了部分weka的源代码。可以将项目导入eclipse运行

/*
 *    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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * MexicanHat.java
 * Copyright (C) 2005 University of Waikato, Hamilton, New Zealand
 *
 */

package weka.datagenerators.classifiers.regression;

import weka.core.Attribute;
import weka.core.FastVector;
import weka.core.Instance;
import weka.core.Instances;
import weka.core.Option;
import weka.core.Utils;
import weka.datagenerators.RegressionGenerator;

import java.util.Enumeration;
import java.util.Random;
import java.util.Vector;

/**
 <!-- globalinfo-start -->
 * A data generator for the simple 'Mexian Hat' function:<br/>
 *    y = sin|x| / |x|<br/>
 * In addition to this simple function, the amplitude can be changed and gaussian noise can be added.
 * <p/>
 <!-- globalinfo-end -->
 *
 <!-- options-start -->
 * Valid options are: <p/>
 * 
 * <pre> -h
 *  Prints this help.</pre>
 * 
 * <pre> -o &lt;file&gt;
 *  The name of the output file, otherwise the generated data is
 *  printed to stdout.</pre>
 * 
 * <pre> -r &lt;name&gt;
 *  The name of the relation.</pre>
 * 
 * <pre> -d
 *  Whether to print debug informations.</pre>
 * 
 * <pre> -S
 *  The seed for random function (default 1)</pre>
 * 
 * <pre> -n &lt;num&gt;
 *  The number of examples to generate (default 100)</pre>
 * 
 * <pre> -A &lt;num&gt;
 *  The amplitude multiplier (default 1.0).</pre>
 * 
 * <pre> -R &lt;num&gt;..&lt;num&gt;
 *  The range x is randomly drawn from (default -10.0..10.0).</pre>
 * 
 * <pre> -N &lt;num&gt;
 *  The noise rate (default 0.0).</pre>
 * 
 * <pre> -V &lt;num&gt;
 *  The noise variance (default 1.0).</pre>
 * 
 <!-- options-end -->
 *
 * @author  FracPete (fracpete at waikato dot ac dot nz)
 * @version $Revision: 1.3 $
 */

public class MexicanHat
  extends RegressionGenerator {

  /** for serialization */
  static final long serialVersionUID = 4577016375261512975L;
  
  /** the amplitude of y */
  protected double m_Amplitude;

  /** the lower boundary of the range, x is drawn from */
  protected double m_MinRange;

  /** the upper boundary of the range, x is drawn from */
  protected double m_MaxRange;

  /** the rate of the gaussian noise */
  protected double m_NoiseRate;

  /** the variance of the gaussian noise */
  protected double m_NoiseVariance;

  /** the random number generator for the noise */
  protected Random m_NoiseRandom = null;

  /**
   * initializes the generator
   */
  public MexicanHat() {
    super();

    setAmplitude(defaultAmplitude());
    setMinRange(defaultMinRange());
    setMaxRange(defaultMaxRange());
    setNoiseRate(defaultNoiseRate());
    setNoiseVariance(defaultNoiseVariance());
  }
  
  /**
   * Returns a string describing this data generator.
   *
   * @return a description of the data generator suitable for
   * displaying in the explorer/experimenter gui
   */
  public String globalInfo() {
    return 
        "A data generator for the simple 'Mexian Hat' function:\n"
        + "   y = sin|x| / |x|\n"
        + "In addition to this simple function, the amplitude can be changed and "
        + "gaussian noise can be added.";
  }

  /**
   * Returns an enumeration describing the available options.
   *
   * @return an enumeration of all the available options
   */
  public Enumeration listOptions() {
    Vector result = enumToVector(super.listOptions());

    result.addElement(new Option(
              "\tThe amplitude multiplier (default " 
              + defaultAmplitude() + ").",
              "A", 1, "-A <num>"));

    result.addElement(new Option(
              "\tThe range x is randomly drawn from (default " 
              + defaultMinRange() + ".." + defaultMaxRange() + ").",
              "R", 1, "-R <num>..<num>"));

    result.addElement(new Option(
              "\tThe noise rate (default " 
              + defaultNoiseRate() + ").",
              "N", 1, "-N <num>"));

    result.addElement(new Option(
              "\tThe noise variance (default "
              + defaultNoiseVariance() + ").",
              "V", 1, "-V <num>"));

    return result.elements();
  }
  
  /**
   * Parses a list of options for this object. <p/>
   *
   <!-- options-start -->
   * Valid options are: <p/>
   * 
   * <pre> -h
   *  Prints this help.</pre>
   * 
   * <pre> -o &lt;file&gt;
   *  The name of the output file, otherwise the generated data is
   *  printed to stdout.</pre>
   * 
   * <pre> -r &lt;name&gt;
   *  The name of the relation.</pre>
   * 
   * <pre> -d
   *  Whether to print debug informations.</pre>
   * 
   * <pre> -S
   *  The seed for random function (default 1)</pre>
   * 
   * <pre> -n &lt;num&gt;
   *  The number of examples to generate (default 100)</pre>
   * 
   * <pre> -A &lt;num&gt;
   *  The amplitude multiplier (default 1.0).</pre>
   * 
   * <pre> -R &lt;num&gt;..&lt;num&gt;
   *  The range x is randomly drawn from (default -10.0..10.0).</pre>
   * 
   * <pre> -N &lt;num&gt;
   *  The noise rate (default 0.0).</pre>
   * 
   * <pre> -V &lt;num&gt;
   *  The noise variance (default 1.0).</pre>
   * 
   <!-- options-end -->
   *
   * @param options the list of options as an array of strings
   * @exception Exception if an option is not supported
   */
  public void setOptions(String[] options) throws Exception {
    String        tmpStr;
   
    super.setOptions(options);

    tmpStr = Utils.getOption('A', options);
    if (tmpStr.length() != 0)
      setAmplitude(Double.parseDouble(tmpStr));
    else
      setAmplitude(defaultAmplitude());

    tmpStr = Utils.getOption('R', options);
    if (tmpStr.length() != 0)
      setRange(tmpStr);
    else
      setRange(defaultMinRange() + ".." + defaultMaxRange());
    
    tmpStr = Utils.getOption('N', options);
    if (tmpStr.length() != 0)
      setNoiseRate(Double.parseDouble(tmpStr));
    else
      setNoiseRate(defaultNoiseRate());

    tmpStr = Utils.getOption('V', options);
    if (tmpStr.length() != 0)
      setNoiseVariance(Double.parseDouble(tmpStr));
    else
      setNoiseVariance(defaultNoiseVariance());
  }

  /**
   * Gets the current settings of the datagenerator BIRCHCluster.
   *
   * @return an array of strings suitable for passing to setOptions
   */
  public String[] getOptions() {
    Vector        result;
    String[]      options;
    int           i;
    
    result  = new Vector();
    options = removeBlacklist(super.getOptions());
    for (i = 0; i < options.length; i++)
      result.add(options[i]);

    result.add("-A"); 
    result.add("" + getAmplitude());

    result.add("-R"); 
    result.add("" + getRange());

    result.add("-N"); 
    result.add("" + getNoiseRate());

    result.add("-V"); 
    result.add("" + getNoiseVariance());
    
    return (String[]) result.toArray(new String[result.size()]);
  }

  /**
   * returns the default amplitude
   * 
   * @return the default amplitude
   */
  protected double defaultAmplitude() {
    return 1.0;
  }

  /**
   * Gets the amplitude multiplier.
   *
   * @return the amplitude multiplier
   */
  public double getAmplitude() { 
    return m_Amplitude; 
  }
  
  /**
   * Sets the amplitude multiplier.
   *
   * @param value the amplitude multiplier
   */
  public void setAmplitude(double value) {
    m_Amplitude = value;
  }
  
  /**
   * Returns the tip text for this property
   * 
   * @return tip text for this property suitable for
   *         displaying in the explorer/experimenter gui
   */
  public String amplitudeTipText() {
    return "The amplitude of the mexican hat.";
  }

  /**
   * Sets the upper and lower boundary for the range of x
   *
   * @param fromTo the string containing the upper and lower boundary for
   *               the range of x, separated by ..
   */
  protected void setRange(String fromTo) {
    int i = fromTo.indexOf("..");
    String from = fromTo.substring(0, i);
    setMinRange(Double.valueOf(from).doubleValue());
    String to = fromTo.substring(i + 2, fromTo.length());
    setMaxRange(Double.valueOf(to).doubleValue());
  }

  /**