Example usage for org.apache.commons.math.random JDKRandomGenerator setSeed

Introduction

In this page you can find the example usage for org.apache.commons.math.random JDKRandomGenerator setSeed.

Prototype

public void setSeed(int[] seed) 

Source Link

Usage

From source file:lfsom.visualization.clustering.LFSKMeans.java

/**
 * cluster centres are initialised by equally sized random chunks of the
 * input data when there's 150 instances, we assign 50 chosen randomly to
 * each cluster and calculate its centre from these (the last cluster might
 * be larger if numInstances mod k < 0)
 */// ww w .  jav  a  2s  .c  om
private void initClustersEqualNumbers() {
    HashSet<Integer> usedIndices = new HashSet<Integer>();
    int limit = numberOfInstances / k;
    // FIXME: Test clustering with new permutation generator!
    // int[] randPermIndices = RandomTools.permutation(new
    // Random(RANDOM_SEED), this.numberOfInstances);
    JDKRandomGenerator rg = new JDKRandomGenerator();
    rg.setSeed(RANDOM_SEED);
    int[] randPermIndices = new RandomDataImpl(rg).nextPermutation(this.numberOfInstances,
            this.numberOfInstances);
    for (int clusterIndex = 0; clusterIndex < k; clusterIndex++) {
        LFSCluster c = new LFSCluster(new double[data[0].length]);
        // System.out.println("cluster: " + clusterIndex);
        for (int randPermIndice : randPermIndices) {
            int currentIndex = randPermIndice;
            if ((c.getNumberOfInstances() < limit || clusterIndex == k - 1)
                    && !usedIndices.contains(currentIndex)) {
                c.addIndex(currentIndex);
                usedIndices.add(currentIndex);
                // System.out.print(" " + currentIndex);
            }
        }
        // System.out.println();
        c.calculateCentroid(data);
        // clusters[clusterIndex] = c;
        clusters[clusterIndex] = new LFSCluster(c.getCentroid());

    }
}

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From source file:org.hippoecm.hst.demo.addonmodules.randomnumbers.RandomGeneratorImpl.java

public RandomGeneratorImpl() {
    JDKRandomGenerator rg = new JDKRandomGenerator();
    rg.setSeed(System.currentTimeMillis());
    generator = new UniformRandomGenerator(rg);
}

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