Examples of weka.core.Instance.classValue()

weka.core.Instance.classValue()
Returns an instance's class value in internal format. (ie. as a floating-point number) @return the corresponding value as a double (If the corresponding attribute is nominal (or a string) then it returns the value's index as a double). @throws UnassignedClassException if the class is not set or the instance doesn'thave access to a dataset

    
  sndCover += inst.weight();
  if(m_ClassAttribute.isNominal()) // Nominal class
    snd[(int)inst.classValue()] += inst.weight();    
  else{                            // Numeric class
    sndWtSq += inst.weight() * inst.classValue() * inst.classValue();
    sndWtVl += inst.weight() * inst.classValue();
  }
      }

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  sndCover += inst.weight();
  if(m_ClassAttribute.isNominal()) // Nominal class
    snd[(int)inst.classValue()] += inst.weight();    
  else{                            // Numeric class
    sndWtSq += inst.weight() * inst.classValue() * inst.classValue();
    sndWtVl += inst.weight() * inst.classValue();
  }
      }
      
      
      // Enough Instances with known values?

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      Instances missingData = new Instances(data, 0);
      for(int y=total; y < data.numInstances(); y++){      
  Instance inst = data.instance(y);
  missingData.add(inst);
  if(m_ClassAttribute.isNominal())
    missing[(int)inst.classValue()] += inst.weight();
  else{ 
    msingWtSq += inst.weight() * inst.classValue() * inst.classValue();
    msingWtVl += inst.weight() * inst.classValue();
  }      
      }

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  Instance inst = data.instance(y);
  missingData.add(inst);
  if(m_ClassAttribute.isNominal())
    missing[(int)inst.classValue()] += inst.weight();
  else{ 
    msingWtSq += inst.weight() * inst.classValue() * inst.classValue();
    msingWtVl += inst.weight() * inst.classValue();
  }      
      }      
      
      if(total == 0) return null; // Data all missing for the attribute

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  Instance inst = data.instance(y);
  missingData.add(inst);
  if(m_ClassAttribute.isNominal())
    missing[(int)inst.classValue()] += inst.weight();
  else{ 
    msingWtSq += inst.weight() * inst.classValue() * inst.classValue();
    msingWtVl += inst.weight() * inst.classValue();
  }      
      }      
      
      if(total == 0) return null; // Data all missing for the attribute

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  missingData.add(inst);
  if(m_ClassAttribute.isNominal())
    missing[(int)inst.classValue()] += inst.weight();
  else{ 
    msingWtSq += inst.weight() * inst.classValue() * inst.classValue();
    msingWtVl += inst.weight() * inst.classValue();
  }      
      }      
      
      if(total == 0) return null; // Data all missing for the attribute

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    // Move the split point
    for(int y=prev; y<split; y++){
      Instance inst = data.instance(y);
      fstCover += inst.weight(); sndCover -= inst.weight();
      if(m_ClassAttribute.isNominal()){ // Nominal class
        fst[(int)inst.classValue()] += inst.weight();
        snd[(int)inst.classValue()] -= inst.weight();
      }   
      else{                             // Numeric class
        fstWtSq += inst.weight() * inst.classValue() * inst.classValue();
        fstWtVl += inst.weight() * inst.classValue();

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    for(int y=prev; y<split; y++){
      Instance inst = data.instance(y);
      fstCover += inst.weight(); sndCover -= inst.weight();
      if(m_ClassAttribute.isNominal()){ // Nominal class
        fst[(int)inst.classValue()] += inst.weight();
        snd[(int)inst.classValue()] -= inst.weight();
      }   
      else{                             // Numeric class
        fstWtSq += inst.weight() * inst.classValue() * inst.classValue();
        fstWtVl += inst.weight() * inst.classValue();
        sndWtSq -= inst.weight() * inst.classValue() * inst.classValue();

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      if(m_ClassAttribute.isNominal()){ // Nominal class
        fst[(int)inst.classValue()] += inst.weight();
        snd[(int)inst.classValue()] -= inst.weight();
      }   
      else{                             // Numeric class
        fstWtSq += inst.weight() * inst.classValue() * inst.classValue();
        fstWtVl += inst.weight() * inst.classValue();
        sndWtSq -= inst.weight() * inst.classValue() * inst.classValue();
        sndWtVl -= inst.weight() * inst.classValue();
      }
    }

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      if(m_ClassAttribute.isNominal()){ // Nominal class
        fst[(int)inst.classValue()] += inst.weight();
        snd[(int)inst.classValue()] -= inst.weight();
      }   
      else{                             // Numeric class
        fstWtSq += inst.weight() * inst.classValue() * inst.classValue();
        fstWtVl += inst.weight() * inst.classValue();
        sndWtSq -= inst.weight() * inst.classValue() * inst.classValue();
        sndWtVl -= inst.weight() * inst.classValue();
      }
    }

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