Example usage for weka.core.matrix DoubleVector DoubleVector

Introduction

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

Prototype

public DoubleVector(double v[]) 

Source Link

Document

Constructs a vector directly from a double array

Usage

From source file:tml.utils.DistanceLib.java

License:Apache License

public static double euclidean(Instance inst1, Instance inst2) {
    DoubleVector x = new DoubleVector(inst1.toDoubleArray());
    DoubleVector y = new DoubleVector(inst2.toDoubleArray());

    double distance = x.minus(y).norm2();
    return distance;
}

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From source file:tml.utils.DistanceLib.java

License:Apache License

public static double cosine(Instance inst1, Instance inst2) {
    DoubleVector x = new DoubleVector(inst1.toDoubleArray());
    DoubleVector y = new DoubleVector(inst2.toDoubleArray());

    double dotXY = x.times(y).norm1();
    double cosim = dotXY / (x.norm2() * y.norm2());

    return cosim;
}

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From source file:tml.utils.DistanceLib.java

License:Apache License

public static double jaccard(Instance inst1, Instance inst2) {
    DoubleVector x = new DoubleVector(inst1.toDoubleArray());
    DoubleVector y = new DoubleVector(inst2.toDoubleArray());

    double intersection = 0.0;

    for (int i = 0; i < x.size(); i++) {
        intersection += Math.min(x.get(i), y.get(i));
    }//from ww w  .java  2 s  .  c  o m
    if (intersection > 0.0) {
        double union = x.norm1() + y.norm1() - intersection;
        return intersection / union;
    } else {
        return 0.0;
    }
}

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