Example usage for java.lang Math random

Introduction

In this page you can find the example usage for java.lang Math random.

Prototype

public static double random()

Source Link

Document

Returns a double value with a positive sign, greater than or equal to 0.0 and less than 1.0 .

Usage

From source file:Main.java

/**
 * Given a byte array of content, writes it to a temporary file and then
 * returns the path to it as a URL//from  ww w . j  av  a  2 s  .c  o m
 * @param contents The content of the file
 * @param type The file extension to use
 * @throws IOException if an error occurs
 */
public static URL stringToTempFile(byte[] contents, String type) throws IOException {

    // Make sure we have a temp directory
    checkForTempDirectory();

    // Generate a random file name and keep doing it until we get a unique one
    File f = null;
    String fName = null;
    do {
        fName = tempDirectory + File.separator + ((int) (Math.random() * 10000000)) + "." + type;
        f = new File(fName);
    } while (f.exists());

    System.out.println("TEMP: Creating temp file " + fName);
    FileOutputStream out = new FileOutputStream(f);
    out.write(contents);
    out.close();

    // Remember this file for later deletion
    tempFileList.add(fName);

    return new URL("file://" + fName);
}

From source file:com.lzhao.framework.spring_hibernate.demo.util.RandomUtil.java

public static String randomStateAbbr() {
    return STATES_ABBR[(int) (Math.random() * (STATES_ABBR.length - 1))];
}

From source file:Main.java

public static int irandom(int b)
// Random integer within range {0,...,b}    
{
    return (int) ((b + 1) * Math.random());
}

From source file:Main.java

public static double normal(double u, double s)
// Random normal distribution with mean u and standard deviation s
{
    double fac, rsq, v1, v2;

    if (iset == 0) {
        do {/* w  w  w.  j a  va2  s  .c  o m*/
            v1 = 2.0 * Math.random() - 1.0;
            v2 = 2.0 * Math.random() - 1.0;
            rsq = v1 * v1 + v2 * v2;
        } while (rsq >= 1.0 || rsq == 0.0);
        fac = Math.sqrt(-2.0 * Math.log(rsq) / rsq);
        gset = v1 * fac;
        iset = 1;
        return (u + s * (v2 * fac));
    } else {
        iset = 0;
        return (u + s * gset);
    }
}

From source file:org.jfree.chart.demo.DifferenceChartDemo1.java

private static XYDataset createDataset() {
    TimeSeries timeseries = new TimeSeries("Random 1");
    TimeSeries timeseries1 = new TimeSeries("Random 2");
    double d = 0.0D;
    double d1 = 0.0D;
    Day day = new Day();
    for (int i = 0; i < 200; i++) {
        d = (d + Math.random()) - 0.5D;
        d1 = (d1 + Math.random()) - 0.5D;
        timeseries.add(day, d);//from  w  w w. j  a  va2 s.  c o m
        timeseries1.add(day, d1);
        day = (Day) day.next();
    }

    TimeSeriesCollection timeseriescollection = new TimeSeriesCollection();
    timeseriescollection.addSeries(timeseries);
    timeseriescollection.addSeries(timeseries1);
    return timeseriescollection;
}

From source file:org.jfree.chart.demo.DeviationRendererDemo1.java

private static XYDataset createDataset() {
    YIntervalSeries series1 = new YIntervalSeries("Series 1");
    YIntervalSeries series2 = new YIntervalSeries("Series 2");
    double d = 100D;
    double d1 = 100D;
    for (int i = 0; i <= 100; i++) {
        d = (d + Math.random()) - 0.47999999999999998D;
        double d2 = 0.050000000000000003D * (double) i;
        series1.add(i, d, d - d2, d + d2);
        d1 = (d1 + Math.random()) - 0.5D;
        double d3 = 0.070000000000000007D * (double) i;
        series2.add(i, d1, d1 - d3, d1 + d3);
    }// w ww.  ja va2  s . com

    YIntervalSeriesCollection dataset = new YIntervalSeriesCollection();
    dataset.addSeries(series1);
    dataset.addSeries(series2);
    return dataset;
}

From source file:lanchester.TestEigen.java

public static Array2DRowRealMatrix getMat(int num) {
    Array2DRowRealMatrix mat = new Array2DRowRealMatrix(num, num);
    for (int i1 = 0; i1 < num; i1++) {
        for (int i2 = 0; i2 < num; i2++) {
            mat.setEntry(i1, i2, Math.random());
        }/*from   w w w  .ja  v a2s.com*/
    }
    return mat;
}

From source file:gov.jgi.meta.hadoop.input.FastqBlockLineReader.java

public static void main(String[] args) {

    int num = 100;
    int last = -1;

    do {/*from   ww w.  j  a  v a  2  s  .co m*/
        try {
            FileInputStream fstream = new FileInputStream("/ifs/scratch/karan/derep-perf/HiSeq-8343080.fq");
            FastqBlockLineReader fblr = new FastqBlockLineReader(fstream);

            Text key = new Text();
            Map<String, String> setofreads = new HashMap<String, String>();
            int length = (int) (Math.random() * 1000000);
            System.out.println("iteration " + num + " length = " + length);

            int total = 0;

            fblr.readLine(key, setofreads, Integer.MAX_VALUE, length);
            //            System.out.println("setofreads.size = " + setofreads.size());
            total += setofreads.size();
            //for (String s : setofreads.keySet()) {
            //                System.out.println(s);
            //            }
            int m = 0;
            while (setofreads.size() > 0) {
                System.out.print(".");
                if ((++m) % 80 == 0)
                    System.out.print("\n");

                setofreads.clear();
                fblr.readLine(key, setofreads, Integer.MAX_VALUE, length);
                //              System.out.println("setofreads.size = " + setofreads.size());
                total += setofreads.size();
            }
            System.out.println("\ntotal = " + total);

            if (last != -1) {
                if (last != total) {
                    System.out.println(
                            "error!!!, length = " + length + ": last = " + last + " current = " + total);
                }
            }
            last = total;

        } catch (Exception e) {
            System.out.println(e);
        }
    } while (num-- > 0);
}

From source file:jquery.service.NombreAleatoireService.java

public int nombreAleatoire(int borneInf, int borneSup) {
    int i = (int) (Math.random() * 1000) % (borneSup + 1 - borneInf) + borneInf;
    return i;//  w  w w . j a v  a2s . com
}

From source file:ar.gob.ambiente.servicios.gestionpersonas.entidades.util.CriptPass.java

/**
 * Mtodo para crear las contraseas de manera aleatoria al crear un usuario por primera vez
 * @return //from  ww  w  .  j  a  va2 s  . co m
 */
public static String generar() {
    int longitud = base.length();
    String contrasenia = "";
    for (int i = 0; i < 8; i++) {
        int numero = (int) (Math.random() * (longitud));
        String caracter = base.substring(numero, numero + 1);
        contrasenia = contrasenia + caracter;
    }
    return contrasenia;
}