Example usage for weka.core Instances deleteWithMissing

Introduction

In this page you can find the example usage for weka.core Instances deleteWithMissing.

Prototype

public void deleteWithMissing(Attribute att) 

Source Link

Document

Removes all instances with missing values for a particular attribute from the dataset.

Usage

From source file:ID3Chi.java

License:Open Source License

private void MakeALeaf(Instances data) {

    data.deleteWithMissing(m_Attribute);

    if (data.numInstances() == 0) {
        SetNullDistribution(data);//from  w  w  w .jav a  2s.  co m
        return;
    }

    m_Distribution = new double[data.numClasses()];
    Enumeration instEnum = data.enumerateInstances();
    while (instEnum.hasMoreElements()) {
        Instance inst = (Instance) instEnum.nextElement();
        m_Distribution[(int) inst.classValue()]++;
    }
    Utils.normalize(m_Distribution);
    m_ClassValue = Utils.maxIndex(m_Distribution);
    m_ClassAttribute = data.classAttribute();

    // set m_Attribute to null to mark this node as a leaf
    m_Attribute = null;
}

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From source file:org.vimarsha.utils.impl.ArffAttributeInfoExtractor.java

License:Open Source License

/**
 * Returns a table model with the attribute related info when the selected attribute index is passed.
 *
 * @param index index of the attribute/*w w  w .j av a2s.c  om*/
 * @return DefaultTableModel
 */
public DefaultTableModel getArffAttributeInfo(int index) {
    DefaultTableModel defaultTableModel = new DefaultTableModel();
    Instances temp = this.arffData;
    //since kthSmallestValue cannot handle missing values, they need to be removed.
    temp.deleteWithMissing(index);
    ArrayList<String> tmp = new ArrayList<String>();
    defaultTableModel.addColumn("Statistics", new String[] { "Name", "Variance", "Min", "Max", "Mean" });
    tmp.add(temp.attribute(index).name());
    tmp.add(String.valueOf(temp.variance(index)));
    tmp.add(String.valueOf(temp.kthSmallestValue(index, 1))); //min value is the 1st smallest value
    tmp.add(String.valueOf(temp.kthSmallestValue(index, temp.numInstances()))); //max value is the last smallest value
    tmp.add(String.valueOf(temp.meanOrMode(index)));
    defaultTableModel.addColumn("Value", tmp.toArray());
    return defaultTableModel;
}

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