Example usage for org.apache.commons.math.util MathUtils distance

Introduction

In this page you can find the example usage for org.apache.commons.math.util MathUtils distance.

Prototype

public static double distance(int[] p1, int[] p2) 

Source Link

Document

Calculates the L₂ (Euclidean) distance between two points.

Usage

From source file:acromusashi.stream.ml.anomaly.lof.LofCalculator.java

/**
 * basePoint?targetPoint?????(Reachability distance)?
 * /* w ww. j  a v  a2s.  c om*/
 * @param basePoint 
 * @param targetPoint 
 * @return ???
 */
protected static double calculateReachDistance(LofPoint basePoint, LofPoint targetPoint) {
    double distance = MathUtils.distance(basePoint.getDataPoint(), targetPoint.getDataPoint());

    double reachDistance = (double) ComparatorUtils.max(distance, targetPoint.getkDistance(),
            ComparatorUtils.NATURAL_COMPARATOR);
    return reachDistance;
}

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From source file:acromusashi.stream.ml.anomaly.lof.LofCalculator.java

/**
 * ??????????????????/* w  ww  . j  a v  a 2  s .  c o m*/
 * 
 * @param targetPoint 
 * @param dataSet 
 * @return ???ID??????
 */
protected static List<DistanceResult> calculateDistances(LofPoint targetPoint, LofDataSet dataSet) {
    List<DistanceResult> distances = new ArrayList<>();
    for (Map.Entry<String, LofPoint> targetEntry : dataSet.getDataMap().entrySet()) {
        // ????
        if (StringUtils.equals(targetEntry.getKey(), targetPoint.getDataId()) == true) {
            continue;
        }

        double distance = MathUtils.distance(targetEntry.getValue().getDataPoint(), targetPoint.getDataPoint());

        DistanceResult result = new DistanceResult(targetEntry.getKey(), distance);

        // ?????
        distances.add(result);
    }

    Collections.sort(distances, new DistanceResultComparator());
    return distances;
}

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From source file:acromusashi.stream.ml.clustering.kmeans.KmeansCalculator.java

/**
 * ????????//w ww .java  2  s . co  m
 * 
 * @param baseCentroids ?
 * @param targetCentroids ? 
 * @param centroidNum 
 * @return ?
 */
protected static List<CentroidMapping> calculateDistances(double[][] baseCentroids, double[][] targetCentroids,
        int centroidNum) {
    // ???????
    List<CentroidMapping> allDistance = new ArrayList<>();

    for (int baseIndex = 0; baseIndex < centroidNum; baseIndex++) {
        for (int targetIndex = 0; targetIndex < centroidNum; targetIndex++) {
            CentroidMapping centroidMapping = new CentroidMapping();
            centroidMapping.setBaseIndex(baseIndex);
            centroidMapping.setTargetIndex(targetIndex);
            double distance = MathUtils.distance(baseCentroids[baseIndex], targetCentroids[targetIndex]);
            centroidMapping.setEuclideanDistance(distance);
            allDistance.add(centroidMapping);
        }
    }
    return allDistance;
}

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