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:io.seldon.api.service.ABTestingServer.java

public static CFAlgorithm getUserTest(String consumer, String recTag, String clientUserId) {
    CFAlgorithm res = null;//from   www .j  a  v a  2  s .  c om
    final String abTestKey = getABTestKey(consumer, recTag);
    ABTest abTest = tests.get(abTestKey);
    if (abTest != null) {
        String mKey = MemCacheKeys.getABTestingUser(abTestKey, clientUserId,
                abTest.getAlgorithm().getAbTestingKey());
        Boolean inTest = (Boolean) MemCachePeer.get(mKey);
        if (inTest == null) {
            // decide whether this user should be in test and store in memcache
            if (Math.random() <= abTest.getPercentage()) {
                MemCachePeer.put(mKey, new Boolean(true), CACHING_TIME);
                res = abTest.getAlgorithm();
            } else {
                //Store the fact this user is not in the test
                MemCachePeer.put(mKey, new Boolean(false), CACHING_TIME);
            }
        } else if (inTest) {
            res = abTest.getAlgorithm();
        }

    }
    return res;
}

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From source file:br.com.everson.clei.springmvc.controller.ClienteController.java

@RequestMapping("/salvarCadastroDeCliente")
public String persistirNovoCliente(Model m, Cliente c) {
    c.setId(Math.round(Math.random() * 10000));
    try {//  www  .j av  a  2 s .  c  o  m
        begin();
        getSession().save(c);
        commit();
    } catch (HibernateException e) {
        rollback();
        e.printStackTrace();
    }
    clientes.add(c);
    return "redirect:inicio";
}

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From source file:lirmm.inria.fr.evaluation.Metrics.java

public static void evaluate(DataMatrix R, BigSparseRealMatrix U, BigSparseRealMatrix V) {
    OpenLongToDoubleHashMap rowsMAE = new OpenLongToDoubleHashMap(0.0);
    OpenLongToDoubleHashMap rowsRMSE = new OpenLongToDoubleHashMap(0.0);
    OpenLongToDoubleHashMap rowsT = new OpenLongToDoubleHashMap(0.0);
    //-------------------------------------------------------------------
    OpenLongToDoubleHashMap columnsMAE = new OpenLongToDoubleHashMap(0.0);
    OpenLongToDoubleHashMap columnsRMSE = new OpenLongToDoubleHashMap(0.0);
    OpenLongToDoubleHashMap columnsT = new OpenLongToDoubleHashMap(0.0);

    double RMSE = 0;
    double MAE = 0;
    double RMSERand = 0;
    double MAERand = 0;
    int k = 0;//  w  w w .j a v a2  s .c om
    for (OpenLongToDoubleHashMap.Iterator iterator = R.getTestSetEntries().iterator(); iterator.hasNext();) {
        k++;
        iterator.advance();
        final double value = iterator.value();
        final long key = iterator.key();
        final int i, j;
        i = (int) (key / R.getColumnDimension());
        j = (int) (key % R.getColumnDimension());
        //            double estimation = U.transpose().getRowVector(j).dotProduct(V.getColumnVector(j));
        double estimation = getDotProduct(U, i, V, j);
        RMSE += FastMath.pow(value - estimation, 2);
        MAE += FastMath.abs(value - estimation);
        double r = Math.random() * R.getMax();
        RMSERand += FastMath.pow(value - r, 2);
        MAERand += FastMath.abs(value - r);

        double v = rowsMAE.get(R.getRowNonZeroEntry(i));
        rowsMAE.put(R.getRowNonZeroEntry(i), v + FastMath.abs(value - estimation));
        v = rowsRMSE.get(R.getRowNonZeroEntry(i));
        rowsRMSE.put(R.getRowNonZeroEntry(i), v + FastMath.pow(value - estimation, 2));
        v = rowsT.get(R.getRowNonZeroEntry(i));
        rowsT.put(R.getRowNonZeroEntry(i), v + 1);

        v = columnsMAE.get(R.getColumnNonZeroEntry(j));
        columnsMAE.put(R.getColumnNonZeroEntry(j), v + FastMath.abs(value - estimation));
        v = columnsRMSE.get(R.getColumnNonZeroEntry(j));
        columnsRMSE.put(R.getColumnNonZeroEntry(j), v + FastMath.pow(value - estimation, 2));
        v = columnsT.get(R.getColumnNonZeroEntry(j));
        columnsT.put(R.getColumnNonZeroEntry(j), v + 1);
    }
    System.out.println("******************************************");
    for (OpenLongToDoubleHashMap.Iterator iterator = rowsMAE.iterator(); iterator.hasNext();) {
        iterator.advance();
        final long key = iterator.key();
        double localMAE = rowsMAE.get(key) / rowsT.get(key);
        double localRMSE = FastMath.sqrt(rowsRMSE.get(key) / rowsT.get(key));
        System.out.println(key + "\t" + (int) rowsT.get(key) + "\t" + localMAE + "\t" + localRMSE);
    }
    System.out.println("******************************************");
    for (OpenLongToDoubleHashMap.Iterator iterator = columnsMAE.iterator(); iterator.hasNext();) {
        iterator.advance();
        final long key = iterator.key();
        double localMAE = columnsMAE.get(key) / columnsT.get(key);
        double localRMSE = FastMath.sqrt(columnsRMSE.get(key) / columnsT.get(key));
        System.out.println(key + "\t" + (int) columnsT.get(key) + "\t" + localMAE + "\t" + localRMSE);
    }
    RMSE /= k;
    MAE /= k;
    RMSE = FastMath.sqrt(RMSE);
    RMSERand /= k;
    MAERand /= k;
    RMSERand = FastMath.sqrt(RMSERand);
    System.out.println("******************************************");
    System.out.println("Type\tMAE\tRMSE");
    System.out.println("DPMF\t" + MAE + "\t" + RMSE);
    System.out.println("Random\t" + MAERand + "\t" + RMSERand);
    System.out.println("******************************************");
}

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From source file:tech.beshu.ror.integration.FieldLevelSecurityTests.java

private static void insertDoc(String docName, RestClient restClient, String idx, String field) {
    if (adminClient == null) {
        adminClient = restClient;/*from   ww  w .j  a va2  s  . com*/
    }

    String path = "/" + IDX_PREFIX + idx + "/documents/doc-" + docName + String.valueOf(Math.random());
    try {

        HttpPut request = new HttpPut(restClient.from(path));
        request.setHeader("Content-Type", "application/json");
        request.setHeader("refresh", "true");
        request.setHeader("timeout", "50s");

        String body = "{\"" + field + "\": \"" + docName + "\", \"dummy2\": true}";
        System.out.println("inserting: " + body);
        request.setEntity(new StringEntity(body));
        System.out.println(body(restClient.execute(request)));

    } catch (Exception e) {
        e.printStackTrace();
        throw new IllegalStateException("Test problem", e);
    }

    // Polling phase.. #TODO is there a better way?
    try {
        Thread.sleep(5000);

        HttpResponse response;
        do {
            HttpHead request = new HttpHead(restClient.from(path));
            request.setHeader("x-api-key", "p");
            response = restClient.execute(request);
            System.out.println(
                    "polling for " + docName + ".. result: " + response.getStatusLine().getReasonPhrase());
            Thread.sleep(200);
        } while (response.getStatusLine().getStatusCode() != 200);
    } catch (Exception e) {
        e.printStackTrace();
        throw new IllegalStateException("Cannot configure test case", e);
    }

}

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From source file:com.taobao.top.common.server.RefundMessageUrlKit.java

private static int getRandomNumber() {
    // 18?/*from www .j av a2s  .c o m*/
    int r = (int) Math.round(Math.random() * 7 + 1);
    return r;
}

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From source file:utils.RandomVariable.java

/**
 * Generate a random string using the specified prefix and a fixed length.
 * @param prefix//  w  w  w . j  a v a  2 s. c  o m
 *        the specified string prefix.
 * @param length
 *        the length of the string to be appended.
 * @return random string.
 */
public static String randString(String prefix, int length) {
    StringBuilder result = new StringBuilder(prefix);
    for (int i = 0; i < length; i++) {
        char ch = (char) ((Math.random() * 26) + 97);
        result.append(ch);
    }

    return result.toString();
}

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From source file:cv.mikusher.freechart.TimeSeries_AWT.java

private XYDataset createDataset() {
    final TimeSeries series = new TimeSeries("Random Data");
    Second current = new Second();
    double value = 100.0;
    for (int i = 0; i < 4000; i++) {
        try {//from   ww  w  . j a  va 2  s  . c o  m
            value = value + Math.random() - 0.5;
            series.add(current, new Double(value));
            current = (Second) current.next();
        } catch (SeriesException e) {
            System.err.println("Error adding to series");
        }
    }

    return new TimeSeriesCollection(series);
}

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From source file:com.eyem.services.UsuarioService.java

public Usuario crearUsuario(String email, String nombre, String imagen, String imagenCover)
        throws NoSuchAlgorithmException, UnsupportedEncodingException {
    Usuario u = new Usuario();
    u.setNombre(nombre);//from  w w w. j ava  2s. c  o m
    u.setEmail(email);
    u.setImagen(imagen);
    u.setImagenCover(imagenCover);
    String pass = ((int) (1000000 + Math.random() * 9000000)) + "";
    byte[] bytesOfMessage = pass.getBytes("UTF-8");
    MessageDigest md = MessageDigest.getInstance("MD5");
    byte[] thedigest = md.digest(bytesOfMessage);
    String p = new String(thedigest);
    u.setPass(p);
    usuarioRepository.insert(u);
    return u;
}

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From source file:Main.java

private ObservableList<XYChart.Series<String, Double>> getChartData() {
    double aValue = 1.56;
    double bValue = 1.06;
    ObservableList<XYChart.Series<String, Double>> answer = FXCollections.observableArrayList();
    Series<String, Double> aSeries = new Series<String, Double>();
    Series<String, Double> bSeries = new Series<String, Double>();
    aSeries.setName("a");
    bSeries.setName("b");

    for (int i = 2011; i < 2021; i++) {
        aSeries.getData().add(new XYChart.Data(Integer.toString(i), aValue));
        aValue = aValue + Math.random() - .5;
        bSeries.getData().add(new XYChart.Data(Integer.toString(i), bValue));
        bValue = bValue + Math.random() - .5;
    }//  w w  w .jav a 2s. c o  m
    answer.addAll(aSeries, bSeries);
    return answer;
}

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From source file:blue.soundObject.PatternObjectTest.java

public void testClone() {
    PatternObject p = new PatternObject();
    p.addPattern(0);//from w ww  .  java2 s.  co m
    p.addPattern(0);
    p.addPattern(0);

    for (int i = 0; i < p.size(); i++) {
        Pattern pat = p.getPattern(i);

        for (int j = 0; j < pat.values.length; j++) {
            pat.values[j] = (Math.random() > 0.5d);
        }
    }

    SoundObject clone = (SoundObject) p.clone();

    boolean isEqual = EqualsBuilder.reflectionEquals(p, clone);

    if (!isEqual) {
        StringBuilder buffer = new StringBuilder();
        buffer.append("Problem with Pattern\n");
        buffer.append("Original Object\n");
        buffer.append(ToStringBuilder.reflectionToString(p)).append("\n");
        buffer.append("Cloned Object\n");
        buffer.append(ToStringBuilder.reflectionToString(clone)).append("\n");

        System.out.println(buffer.toString());

    }

    assertTrue(isEqual);

    assertEquals(p.saveAsXML(null).toString(), clone.saveAsXML(null).toString());
}

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