Example usage for org.apache.commons.math3.random SobolSequenceGenerator nextVector

Introduction

In this page you can find the example usage for org.apache.commons.math3.random SobolSequenceGenerator nextVector.

Prototype

public double[] nextVector() 

Source Link

Usage

From source file:exploration.rendezvous.MultiPointRendezvousStrategy.java

public static LinkedList<NearRVPoint> generateSobolPoints(OccupancyGrid grid, double density) {
    SobolSequenceGenerator sobolGen = new SobolSequenceGenerator(2);

    //int numPointsToGenerate = grid.getNumFreeCells() * 150 / 432000;
    int numPointsToGenerate = (int) (grid.getNumFreeCells() / density); //roughly every 20 sq. cells
    if (SimConstants.DEBUG_OUTPUT) {
        System.out.println("Generating " + numPointsToGenerate + " Sobol points");
    }/*from  ww  w  .  ja  va2 s  .  c  o  m*/

    LinkedList<NearRVPoint> genPoints = new LinkedList<NearRVPoint>();

    for (int i = 0; i < numPointsToGenerate; i++) {
        int x = 0;
        int y = 0;
        double[] vector;
        do {
            vector = sobolGen.nextVector();
            x = (int) (vector[0] * grid.width);
            y = (int) (vector[1] * grid.height);
        } while (!grid.freeSpaceAt(x, y));

        NearRVPoint pd = new NearRVPoint(x, y);

        /*simConfig.getEnv().setPathStart(pd.point);
        simConfig.getEnv().setPathGoal(expLocation);
        simConfig.getEnv().getTopologicalPath(false);
        pd.distance1 = simConfig.getEnv().getPath().getLength();
                
        simConfig.getEnv().setPathStart(pd.point);
        simConfig.getEnv().setPathGoal(relLocation);
        simConfig.getEnv().getTopologicalPath(false);
        pd.distance2 = simConfig.getEnv().getPath().getLength();*/
        genPoints.add(pd);
        //freeSpace.remove(index);
    }

    return genPoints;
}

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From source file:jeplus.JEPlusProject.java

public String[][] getSobolJobList(int LHSsize, Random randomsrc) {

    if (randomsrc == null)
        randomsrc = RandomSource.getRandomGenerator();

    String[][] JobList = new String[LHSsize][];

    // Get all parameters (inc. idf and weather) and their distributions
    if (ParamTree != null) {
        // Create sample for each parameter
        String[][] SampledValues = getSampleInEqualProbSegments(LHSsize, randomsrc);
        int length = SampledValues.length;
        // Generate Sobol sequence
        SobolSequenceGenerator SSG = new SobolSequenceGenerator(length - 1);
        // SSG.skipTo(1000);
        // Shuffle the sample value vector of each parameter
        //            for (int i=1; i<length; i++) {
        //                Collections.shuffle(Arrays.asList(SampledValues[i]), randomsrc);
        //            }
        // n jobs are created by taking a value from each parameter's vector 
        // sequentially
        for (int i = 0; i < LHSsize; i++) {
            double[] vector = SSG.nextVector();
            JobList[i] = new String[length];
            JobList[i][0] = new Formatter().format("SOBOL-%06d", i).toString(); // Job id
            for (int j = 1; j < length; j++) {
                JobList[i][j] = SampledValues[j][Math.round((float) vector[j - 1] * LHSsize)];
            }/*w  w w.j  a v a2 s .  c  o m*/
        }
        return JobList;
    }
    return null;
}

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