Examples of weka.core.Instances.classAttribute()

weka.core.Instances.classAttribute()
Returns the class attribute. @return the class attribute @throws UnassignedClassException if the class is not set

    if (m_ClassIndex < 0) {
      data.setClassIndex(data.numAttributes() - 1);
    } else {
      data.setClassIndex(m_ClassIndex);
    }
    if (data.classAttribute().type() != Attribute.NOMINAL) {
      throw new Exception("Class attribute must be nominal");
    }
    int numClasses = data.numClasses();


    data.deleteWithMissingClass();

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    data   = source.getDataSet();
    if (getClassIndex() == -1)
      data.setClassIndex(data.numAttributes() - 1);
    else
      data.setClassIndex(getClassIndex());
    numeric = data.classAttribute().isNumeric();
    
    // build classifier
    cls = Classifier.makeCopy(getClassifier());
    cls.buildClassifier(data);

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              (i+1) + ". instance (Classifier/Source code): " 
              + predClassifier + " != " + predSource);
        else
          System.out.println(
              (i+1) + ". instance (Classifier/Source code): " 
              + data.classAttribute().value((int) predClassifier) 
              + " != " + data.classAttribute().value((int) predSource));
      }
    }
    
    return result;

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              + predClassifier + " != " + predSource);
        else
          System.out.println(
              (i+1) + ". instance (Classifier/Source code): " 
              + data.classAttribute().value((int) predClassifier) 
              + " != " + data.classAttribute().value((int) predSource));
      }
    }
    
    return result;
  }

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      source = new DataSource(test);
    testRaw = source.getStructure(test.classIndex());
    
    // If class is set then do class based evaluation as well
    if (hasClass) {
      if (testRaw.classAttribute().isNumeric())
  throw new Exception("ClusterEvaluation: Class must be nominal!");


      filter = new Remove();
      ((Remove) filter).setAttributeIndices("" + (testRaw.classIndex() + 1));
      ((Remove) filter).setInvertSelection(false);

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    super.setInputFormat(instanceInfo);


    /* create a new output format (multi-instance format) */
    Instances newData = instanceInfo.stringFreeStructure();
    Attribute attBagIndex = (Attribute) newData.attribute(0).copy();
    Attribute attClass = (Attribute) newData.classAttribute().copy();
    // remove the bagIndex attribute
    newData.deleteAttributeAt(0);
    // remove the class attribute
    newData.setClassIndex(-1);
    newData.deleteAttributeAt(newData.numAttributes() - 1);

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  }
      }
      
      // 3. error flag?
      if (getOutputErrorFlag()) {
  if (result.classAttribute().isNominal()) {
    if (oldInstance.classValue() == m_ActualClassifier.classifyInstance(oldInstance))
      newValues[start] = 0;
    else
      newValues[start] = 1;
  }

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  }
  m_ClassCounts = tmp2;
      }
      
      // Change the class values
      FastVector values = new FastVector(data.classAttribute().numValues());
      for (int i = 0; i < data.numClasses(); i++) {
  values.addElement(data.classAttribute().value(m_Converter[i]));
      }
      FastVector newVec = new FastVector(data.numAttributes());
      for (int i = 0; i < data.numAttributes(); i++) {

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      }
      
      // Change the class values
      FastVector values = new FastVector(data.classAttribute().numValues());
      for (int i = 0; i < data.numClasses(); i++) {
  values.addElement(data.classAttribute().value(m_Converter[i]));
      }
      FastVector newVec = new FastVector(data.numAttributes());
      for (int i = 0; i < data.numAttributes(); i++) {
  if (i == data.classIndex()) {
    newVec.addElement(new Attribute(data.classAttribute().name(), values,

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  values.addElement(data.classAttribute().value(m_Converter[i]));
      }
      FastVector newVec = new FastVector(data.numAttributes());
      for (int i = 0; i < data.numAttributes(); i++) {
  if (i == data.classIndex()) {
    newVec.addElement(new Attribute(data.classAttribute().name(), values, 
            data.classAttribute().getMetadata()));
  } else {
    newVec.addElement(data.attribute(i));
  }
      }

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