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Internal compiler error: java.lang.ArrayIndexOutOfBoundsException: 0.

xiaoshitou

发贴: 7
积分: 0

于 2005-05-11 17:16

package src.classifiers.trees;

import src.classifiers.trees.m5.*;
import java.io.*;
import java.util.*;
import src.core.*;

/**
* M5P. Implements routines for generating M5 model trees.
*
* Valid options are:
*
* -U 
* Use unsmoothed predictions. 
*
* @author <a href="mailto:mhall@cs.waikato.ac.nz">Mark Hall</a>
* @version $Revision: 1.1 $
*/

public class M5P extends M5Base
implements Drawable {

/**
* Creates a new <code>M5P</code> instance.
*/
public M5P() {
super();
setGenerateRules(false);
}

/**
* Returns the type of graph this classifier
* represents.
* @return Drawable.TREE
*/
public int graphType() {
return Drawable.TREE;
}

/**
* Return a dot style String describing the tree.
*
* @return a <code>String</code> value
* @exception Exception if an error occurs
*/
public String graph() throws Exception {
StringBuffer text = new StringBuffer();

text.append("digraph M5Tree {\n");
Rule temp = (Rule)m_ruleSet.elementAt(0);
temp.topOfTree().graph(text);
text.append("}\n");
return text.toString();
}

/**
* Set whether to save instance data at each node in the
* tree for visualization purposes
*
* @param save a <code>boolean</code> value
*/
public void setSaveInstances(boolean save) {
m_saveInstances = save;
}

/**
* Get whether instance data is being save.
*
* @return a <code>boolean</code> value
*/
public boolean getSaveInstances() {
return m_saveInstances;
}

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

Vector newVector = new Vector();
while (superOpts.hasMoreElements()) {
newVector.addElement((Option)superOpts.nextElement());
}

newVector.addElement(new Option("\tSave instances at the nodes in\n"
 +"\tthe tree (for visualization purposes)\n",
 "L", 0, "-L"));
return newVector.elements();
}

/**
* Parses a given list of options. 
*
* Valid options are:
*
* -U 
* Use unsmoothed predictions. 
*
* -R 
* Build a regression tree rather than a model tree. 
*
* -L 
* Save instance data at each node (for visualization purposes). 
*
* @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 {
setSaveInstances(Utils.getFlag('L', options));
super.setOptions(options);
}

/**
* Gets the current settings of the classifier.
*
* @return an array of strings suitable for passing to setOptions
*/
public String [] getOptions() {
String[] superOpts = super.getOptions();
String [] options = new String [superOpts.length+1];
int current = superOpts.length;
for (int i = 0; i < current; i++) {
options[i] = superOpts[i];
}

if (getSaveInstances()) {
options[current++] = "-L";
}

while (current < options.length) {
options[current++] = "";
}

return options;
}

/**
* Main method by which this class can be tested
*
* @param args an array of options
*/
public static void main(String[] args) {
try {
System.out.println(src.classifiers.Evaluation.evaluateModel(
 new M5P(),
 args));
} catch (Exception e) {
System.err.println(e.getMessage());
e.printStackTrace();
}
}
}

大家帮忙看看，怎么会出现Internal compiler error: java.lang.ArrayIndexOutOfBoundsException: 0.
问题

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话题树型展开

人气	标题	作者	字数	发贴时间
8124	Internal compiler error: java.lang.ArrayIndexOutOfBoundsException: 0.	xiaoshitou	3845	2005-05-11 17:16
6973	Re:Internal compiler error: java.lang.ArrayIndexOutOfBoundsException: 0.	uniquejava	117	2005-05-11 18:50
6714	Re:Internal compiler error: java.lang.ArrayIndexOutOfBoundsException: 0.	xiaoshitou	94	2005-05-11 19:11
6628	Re:Internal compiler error: java.lang.ArrayIndexOutOfBoundsException: 0.	xiaoshitou	486	2005-05-11 20:14

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