Example usage for weka.core Instances Instances

Introduction

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

Prototype

public Instances(String name, ArrayList<Attribute> attInfo, int capacity)

Source Link

Document

Creates an empty set of instances.

Usage

From source file:edu.teco.context.recognition.WekaManager.java

License:Apache License

/**
 * Configures WEKA with numeric attributes and nominal class values. Any old
 * values are discarded.//w  w w  . j a  v a  2  s .  c  o m
 * 
 * @param features
 * @param classValues
 */
public void configureArff(String name, List<String> features, List<String> classValues) {
    atts.clear();
    attsTesting.clear();

    // add feature attributes (numeric)
    for (String feature : features) {
        atts.add(new Attribute(feature));
        attsTesting.add(new Attribute(feature));
    }

    // add class attributes (nominal)
    attClassVals = new ArrayList<String>(classValues);
    atts.add(new Attribute("Class", attClassVals));
    attsTesting.add(new Attribute("Class", attClassVals));

    // create instances object
    trainingData = new Instances(name + "_TrainingData", atts, 0);
    testingData = new Instances(name + "_TestingData", atts, 0);

    if (isLogDirectlyToFile) {
        if (!FrameworkContext.getInstance().isConfigurationAlreadySaved()) {
            storeArffFile(trainingData);
        }
    }
}

From source file:edu.utexas.cs.tactex.utils.RegressionUtils.java

License:Open Source License

/**
 * Note: shouldn't use this function in new code.
 * It is kept for backward compatibility since PolyRegCust uses it. 
 * @param xvals//from w w  w.  j  a  v a  2 s  .c  om
 * @param maxDegree
 * @return
 */
public static Instances polyFeatures1D(Double[] xvals, int maxDegree) {

    ArrayList<Attribute> attributes = new ArrayList<Attribute>();
    for (int i = 0; i < maxDegree; ++i) {
        // attribute name is the polynomial power
        Attribute xattr = new Attribute(Integer.toString(i));
        attributes.add(xattr);
    }
    Instances X = new Instances("X", attributes, xvals.length);

    for (int i = 0; i < xvals.length; ++i) {
        ArrayList<Double> features = create1DPolyFeatures(xvals[i], maxDegree);
        Instance row = createInstance(features);
        X.add(row);
    }

    return X;
}

From source file:edu.utexas.cs.tactex.utils.RegressionUtils.java

License:Open Source License

public static Instances createInstances(ArrayList<Instance> instArr, ArrayList<String> attrNames) {
    ArrayList<Attribute> attributes = new ArrayList<Attribute>();
    for (String attr : attrNames) {
        // attribute name is the polynomial power
        attributes.add(new Attribute(attr));
    }//from  w w  w.  j ava 2  s.  c o  m
    Instances X = new Instances("X", attributes, instArr.size());
    for (Instance inst : instArr) {
        X.add(inst);
    }
    return X;
}