Example usage for weka.core.matrix DoubleVector norm1

Introduction

In this page you can find the example usage for weka.core.matrix DoubleVector norm1.

Prototype

public double norm1() 

Source Link

Document

Returns the L1-norm of the vector

Usage

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));
    }/*  www.  java2  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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