Example usage for weka.core.matrix DoubleVector norm2

Introduction

In this page you can find the example usage for weka.core.matrix DoubleVector norm2.

Prototype

public double norm2() 

Source Link

Document

Returns the L2-norm of the vector

Usage

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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