Example usage for org.apache.commons.math3.util ResizableDoubleArray getElements

Introduction

In this page you can find the example usage for org.apache.commons.math3.util ResizableDoubleArray getElements.

Prototype

public synchronized double[] getElements() 

Source Link

Document

Returns a double array containing the elements of this ResizableArray.

Usage

From source file:com.itemanalysis.jmetrik.stats.ranking.RankingAnalysis.java

public String compute() throws SQLException {
    Statement stmt = null;/*from  w w  w  .ja  va 2 s.co m*/
    ResultSet rs = null;

    try {
        //get data
        ResizableDoubleArray data = getData();

        //create columns - dao uses its own transaction
        int numberOfColumns = dao.getColumnCount(conn, tableName);
        int columnNumber = numberOfColumns + 1;
        String newVariableLabel = "Rank";
        if (blom)
            newVariableLabel = "Blom Normal Score";
        if (tukey)
            newVariableLabel = "Tukey Normal Score";
        if (vdw)
            newVariableLabel = "van der Waerden Normal Score";
        if (ntiles)
            newVariableLabel = "Quantiles: " + numGroups + " groups";
        newVariable = new VariableAttributes(newVariableName, newVariableLabel, ItemType.NOT_ITEM,
                DataType.DOUBLE, columnNumber++, "");

        dao.addColumnToDb(conn, tableName, newVariable);

        //compute ranks
        NaturalRanking ranking = new NaturalRanking(NaNStrategy.REMOVED, tiesStrategy);
        double[] ranks = ranking.rank(data.getElements());

        //begin transaction
        conn.setAutoCommit(false);

        //connect to table and update values
        SelectQuery select = new SelectQuery();
        Table sqlTable = new Table(tableName.getNameForDatabase());
        select.addColumn(sqlTable, newVariable.getName().nameForDatabase());
        stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
        rs = stmt.executeQuery(select.toString());

        int nRanks = ranks.length;
        int rankIndex = 0;//array index for ranks (missing values not included)
        int dbIndex = 0;//db row position for case (missing values included)
        double r = Double.NaN;
        boolean missing = false;
        String tempName = "";
        while (rs.next()) {
            missing = missingIndex.contains(dbIndex);
            if (missing) {
                rs.updateNull(newVariable.getName().nameForDatabase());
            } else {
                r = ranks[rankIndex];
                if (blom) {
                    rs.updateDouble(newVariable.getName().nameForDatabase(),
                            normScore.blom(r, (double) nRanks));
                } else if (tukey) {
                    rs.updateDouble(newVariable.getName().nameForDatabase(),
                            normScore.tukey(r, (double) nRanks));
                } else if (vdw) {
                    rs.updateDouble(newVariable.getName().nameForDatabase(),
                            normScore.vanderWaerden(r, (double) nRanks));
                } else if (ntiles) {
                    rs.updateDouble(newVariable.getName().nameForDatabase(),
                            getGroup(r, (double) nRanks, (double) numGroups));
                } else {
                    rs.updateDouble(newVariable.getName().nameForDatabase(), r);
                }
                rankIndex++;
            }
            rs.updateRow();
            updateProgress();
            dbIndex++;
        }
        conn.commit();
        return "Ranks computed";
    } catch (SQLException ex) {
        conn.rollback();
        throw ex;
    } finally {
        if (rs != null)
            rs.close();
        if (stmt != null)
            stmt.close();
        conn.setAutoCommit(true);
    }

}

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