Variable.java

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

public abstract class Variable {

  String name ;
  String value ;
  int column ;

  public Variable() {} ;

  public Variable(String Name) {name = Name; value = null; }

  void   setValue(String val) { value = val ; }
  String getValue() { return value; }

  // used by categorical only
  Vector labels ;

  void setLabels(String Labels) {

    labels = new Vector() ;

    StringTokenizer tok = new StringTokenizer(Labels," ") ;
    while (tok.hasMoreTokens())
         labels.addElement(new String(tok.nextToken())) ;
  }

  // return the label with the specified index
  String getLabel(int index) {
      return (String)labels.elementAt(index);
  }

  // return a string containing all labels
  String getLabels() {

    String labelList = new String();
    Enumeration enume = labels.elements() ;
    while(enume.hasMoreElements())
         labelList += enume.nextElement() + " " ;

    return labelList ;
  }

  // given a label, return its index
  int getIndex(String label) {

    int i = 0, index = 0  ;
    Enumeration enume = labels.elements() ;

    while(enume.hasMoreElements()) {

      if (label.equals(enume.nextElement()))
      { index = i ; break ; }
      i++;
    }

    return i;
  }


  boolean categorical() {
    if (labels != null) {
       return true ;
    } else {
       return false ;
    }
  }

  // used by the DataSet class
  public void setColumn(int col) { column = col ; }
  public abstract void computeStatistics(String inValue) ;
  public abstract int normalize(String inValue, float[] outArray, int inx);
  public int normalizedSize() { return 1 ; }
  public String getDecodedValue(float[] act, int index) { return String.valueOf(act[index]); }

}