Example usage for java.util Random nextDouble

Introduction

In this page you can find the example usage for java.util Random nextDouble.

Prototype

public double nextDouble() 

Source Link

Document

Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.

Usage

From source file:knop.psfj.FovDataSet.java

/**
 * The main method.//from  ww  w  .j a v  a 2s. co m
 *
 * @param args the arguments
 */
public static void main(String[] args) {

    FovDataSet fdt = new FovDataSet();

    FovDataSet fdt2 = new FovDataSet();

    Random rn = new Random();

    /*
     * for (int i = 0; i != 10; i++) { fdt.addValue("bead", rn.nextInt(15));
     * fdt.addValue("x", rn.nextDouble()); fdt.addValue("y", rn.nextDouble());
     * fdt.addValue("z", rn.nextDouble());
     * 
     * fdt.addValue("fwhmX", rn.nextDouble() * 3); fdt.addValue("fwhmY",
     * rn.nextDouble() * 2); fdt.addValue("fwhmZ", rn.nextDouble() * 5); }
     */

    for (int i = 0; i != 10; i++) {
        // fdt.addValue("Index",i);
        fdt.addValue("xSource", rn.nextInt(100));
        fdt2.addValue("xSource", rn.nextDouble() * 200);
        fdt.addValue("xTarget", rn.nextInt(100));
        fdt2.addValue("xTarget", rn.nextInt(200));
        fdt.addValue("a name", "toi");
        fdt2.addValue("a name", "et moi");
    }
    fdt.setSeparator("\t");
    System.out.println(fdt.getColumnStatistics("xSource"));
    fdt.mergeDataSet(fdt2);
    System.out.println(fdt.exportToString());

    //fdt.exportToCrappyFormat("/home/cyril/test.xls");

}

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From source file:apps.LuceneQuery.java

public static void main(String[] args) {
    Options options = new Options();

    options.addOption("d", null, true, "index directory");
    options.addOption("i", null, true, "input file");
    options.addOption("s", null, true, "stop word file");
    options.addOption("n", null, true, "max # of results");
    options.addOption("o", null, true, "a TREC-style output file");
    options.addOption("r", null, true, "an optional QREL file, if specified,"
            + "we save results only for queries for which we find at least one relevant entry.");

    options.addOption("prob", null, true, "question sampling probability");
    options.addOption("max_query_qty", null, true, "a maximum number of queries to run");
    options.addOption("bm25_b", null, true, "BM25 parameter: b");
    options.addOption("bm25_k1", null, true, "BM25 parameter: k1");
    options.addOption("bm25fixed", null, false, "use the fixed BM25 similarity");

    options.addOption("seed", null, true, "random seed");

    Joiner commaJoin = Joiner.on(',');
    Joiner spaceJoin = Joiner.on(' ');

    options.addOption("source_type", null, true,
            "query source type: " + commaJoin.join(SourceFactory.getQuerySourceList()));

    CommandLineParser parser = new org.apache.commons.cli.GnuParser();

    QrelReader qrels = null;/*www . ja v a2 s .c om*/

    try {

        CommandLine cmd = parser.parse(options, args);

        String indexDir = null;

        if (cmd.hasOption("d")) {
            indexDir = cmd.getOptionValue("d");
        } else {
            Usage("Specify 'index directory'", options);
        }

        String inputFileName = null;

        if (cmd.hasOption("i")) {
            inputFileName = cmd.getOptionValue("i");
        } else {
            Usage("Specify 'input file'", options);
        }

        DictNoComments stopWords = null;

        if (cmd.hasOption("s")) {
            String stopWordFileName = cmd.getOptionValue("s");
            stopWords = new DictNoComments(new File(stopWordFileName), true /* lowercasing */);
            System.out.println("Using the stopword file: " + stopWordFileName);
        }

        String sourceName = cmd.getOptionValue("source_type");

        if (sourceName == null)
            Usage("Specify document source type", options);

        int numRet = 100;

        if (cmd.hasOption("n")) {
            numRet = Integer.parseInt(cmd.getOptionValue("n"));
            System.out.println("Retrieving at most " + numRet + " candidate entries.");
        }

        String trecOutFileName = null;

        if (cmd.hasOption("o")) {
            trecOutFileName = cmd.getOptionValue("o");
        } else {
            Usage("Specify 'a TREC-style output file'", options);
        }

        double fProb = 1.0f;

        if (cmd.hasOption("prob")) {
            try {
                fProb = Double.parseDouble(cmd.getOptionValue("prob"));
            } catch (NumberFormatException e) {
                Usage("Wrong format for 'question sampling probability'", options);
            }
        }

        if (fProb <= 0 || fProb > 1) {
            Usage("Question sampling probability should be >0 and <=1", options);
        }

        System.out.println("Sample the following fraction of questions: " + fProb);

        float bm25_k1 = UtilConst.BM25_K1_DEFAULT, bm25_b = UtilConst.BM25_B_DEFAULT;

        if (cmd.hasOption("bm25_k1")) {
            try {
                bm25_k1 = Float.parseFloat(cmd.getOptionValue("bm25_k1"));
            } catch (NumberFormatException e) {
                Usage("Wrong format for 'bm25_k1'", options);
            }
        }

        if (cmd.hasOption("bm25_b")) {
            try {
                bm25_b = Float.parseFloat(cmd.getOptionValue("bm25_b"));
            } catch (NumberFormatException e) {
                Usage("Wrong format for 'bm25_b'", options);
            }
        }

        long seed = 0;

        String tmpl = cmd.getOptionValue("seed");

        if (tmpl != null)
            seed = Long.parseLong(tmpl);

        System.out.println("Using seed: " + seed);

        Random randGen = new Random(seed);

        System.out.println(String.format("BM25 parameters k1=%f b=%f ", bm25_k1, bm25_b));

        boolean useFixedBM25 = cmd.hasOption("bm25fixed");

        EnglishAnalyzer analyzer = new EnglishAnalyzer();
        Similarity similarity = null;

        if (useFixedBM25) {
            System.out.println(String.format("Using fixed BM25Simlarity, k1=%f b=%f", bm25_k1, bm25_b));
            similarity = new BM25SimilarityFix(bm25_k1, bm25_b);
        } else {
            System.out.println(String.format("Using Lucene BM25Similarity, k1=%f b=%f", bm25_k1, bm25_b));
            similarity = new BM25Similarity(bm25_k1, bm25_b);
        }

        int maxQueryQty = Integer.MAX_VALUE;

        if (cmd.hasOption("max_query_qty")) {
            try {
                maxQueryQty = Integer.parseInt(cmd.getOptionValue("max_query_qty"));
            } catch (NumberFormatException e) {
                Usage("Wrong format for 'max_query_qty'", options);
            }
        }

        System.out.println(String.format("Executing at most %d queries", maxQueryQty));

        if (cmd.hasOption("r")) {
            String qrelFile = cmd.getOptionValue("r");
            System.out.println("Using the qrel file: '" + qrelFile
                    + "', queries not returning a relevant entry will be ignored.");
            qrels = new QrelReader(qrelFile);
        }

        System.out.println(String.format("Using indexing directory %s", indexDir));

        LuceneCandidateProvider candProvider = new LuceneCandidateProvider(indexDir, analyzer, similarity);
        TextCleaner textCleaner = new TextCleaner(stopWords);

        QuerySource inpQuerySource = SourceFactory.createQuerySource(sourceName, inputFileName);
        QueryEntry inpQuery = null;

        BufferedWriter trecOutFile = new BufferedWriter(new FileWriter(new File(trecOutFileName)));

        int questNum = 0, questQty = 0;

        long totalTimeMS = 0;

        while ((inpQuery = inpQuerySource.next()) != null) {
            if (questQty >= maxQueryQty)
                break;
            ++questNum;

            String queryID = inpQuery.mQueryId;

            if (randGen.nextDouble() <= fProb) {
                ++questQty;

                String tokQuery = spaceJoin.join(textCleaner.cleanUp(inpQuery.mQueryText));
                String query = TextCleaner.luceneSafeCleanUp(tokQuery).trim();

                ResEntry[] results = null;

                if (query.isEmpty()) {
                    results = new ResEntry[0];
                    System.out.println(String.format("WARNING, empty query id = '%s'", inpQuery.mQueryId));
                } else {

                    try {
                        long start = System.currentTimeMillis();

                        results = candProvider.getCandidates(questNum, query, numRet);

                        long end = System.currentTimeMillis();
                        long searchTimeMS = end - start;
                        totalTimeMS += searchTimeMS;

                        System.out.println(String.format(
                                "Obtained results for the query # %d (answered %d queries), queryID %s the search took %d ms, we asked for max %d entries got %d",
                                questNum, questQty, queryID, searchTimeMS, numRet, results.length));

                    } catch (ParseException e) {
                        e.printStackTrace();
                        System.err.println(
                                "Error parsing query: " + query + " orig question is :" + inpQuery.mQueryText);
                        System.exit(1);
                    }
                }

                boolean bSave = true;

                if (qrels != null) {
                    boolean bOk = false;
                    for (ResEntry r : results) {
                        String label = qrels.get(queryID, r.mDocId);
                        if (candProvider.isRelevLabel(label, 1)) {
                            bOk = true;
                            break;
                        }
                    }
                    if (!bOk)
                        bSave = false;
                }

                //            System.out.println(String.format("Ranking results the query # %d queryId='%s' save results? %b", 
                //                                              questNum, queryID, bSave));          
                if (bSave) {
                    saveTrecResults(queryID, results, trecOutFile, TREC_RUN, numRet);
                }
            }

            if (questNum % 1000 == 0)
                System.out.println(String.format("Proccessed %d questions", questNum));

        }

        System.out.println(String.format("Proccessed %d questions, the search took %f MS on average", questQty,
                (float) totalTimeMS / questQty));

        trecOutFile.close();

    } catch (ParseException e) {
        e.printStackTrace();
        Usage("Cannot parse arguments: " + e, options);
    } catch (Exception e) {
        System.err.println("Terminating due to an exception: " + e);
        System.exit(1);
    }
}

---

From source file:Main.java

public static int randomNumber(int min, int max, Random r) {
    return (int) (r.nextDouble() * (max - min + 1) + min);
}

---

From source file:Main.java

private static double randomDouble() {
    Random random = new Random(0);
    return -5.0 + random.nextDouble() * 10;
}

---

From source file:Main.java

public static long nextPositiveLong() {
    Random random = new Random();
    return (long) (random.nextDouble() * Long.MAX_VALUE);
}

---

From source file:Main.java

public static double getRandomDouble(double max) throws Exception {
    double ret;/*from   w ww. j  av  a 2s.  c o  m*/
    Random r = new Random();
    ret = r.nextDouble() * max;

    return ret;
}

---

From source file:Main.java

/**
 * Get a random double number within a given range;
 *///www  . j  a v  a  2  s .co m
public static double getRandomDouble(double min, double max) throws Exception {
    double range = max - min;

    double ret;

    Random r = new Random();
    ret = r.nextDouble() * range;

    return ret;
}

---

From source file:Main.java

/**
 * Get a random double number from min to max.
 *
 * @param min//  w ww  .  j a v a 2s . c  o m
 *            the minimum value
 * @param max
 *            the maximum value
 * @return
 */
public static double getRandomValue(double min, double max) {
    Random r = new Random();
    return ((int) (10000 * ((r.nextDouble() * (max - min)) + min))) / 10000.0;
}

---

From source file:Main.java

public static double nextDouble(int lower, int upper) {
    Random ra = new Random();
    int n = lower + ra.nextInt(upper - lower);
    double m = ra.nextDouble();
    return n + m;
}

---

From source file:Main.java

public static void fillRandom(double[] array, Random rg) {
    for (int i = 0; i < array.length; i++) {
        array[i] = rg.nextDouble();
    }//w  ww. ja  v a2s  .c o m

}

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