Examples of weka.core.Instances.insertAttributeAt()

weka.core.Instances.insertAttributeAt()
Inserts an attribute at the given position (0 to numAttributes()) and sets all values to be missing. Shallow copies the attribute before it is inserted, and performs a deep copy of the existing attribute information. @param att the attribute to be inserted @param position the attribute's position (position starts with 0) @throws IllegalArgumentException if the given index is out of range


    if ((m_Index.getIndex() < 0) || 
        (m_Index.getIndex() > getInputFormat().numAttributes()))
      throw new IllegalArgumentException("Index out of range");
    
    outputFormat.insertAttributeAt(newAttribute, m_Index.getIndex());
    setOutputFormat(outputFormat);
    
    return true;
  }

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    m_SelectedAttributes = m_CopyCols.getSelection();
    for (int i = 0; i < m_SelectedAttributes.length; i++) {
      int current = m_SelectedAttributes[i];
      // Create a copy of the attribute with a different name
      Attribute origAttribute = instanceInfo.attribute(current);
      outputFormat.insertAttributeAt((Attribute)origAttribute.copy("Copy of " + origAttribute.name()),
             outputFormat.numAttributes());


    }


    // adapt locators

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        //Add the new columns. There is one for each unigram and each bigram.
        for (int i = 0; i < unigrams.size(); i++) {
            String name = "uni_" + unigrams.get(i);
            Attribute attr = new Attribute(name);
            outputFormat.insertAttributeAt(attr, outputFormat.numAttributes());
        }


        for (int i = 0; i < bigrams.size(); i++) {
            String name = "bi_" + bigrams.get(i);
            Attribute attr = new Attribute(name);

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        }


        for (int i = 0; i < bigrams.size(); i++) {
            String name = "bi_" + bigrams.get(i);
            Attribute attr = new Attribute(name);
            outputFormat.insertAttributeAt(attr, outputFormat.numAttributes());
        }


        return outputFormat;
    }

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