Example usage for org.apache.commons.math3.linear SparseRealMatrix getEntry

Introduction

In this page you can find the example usage for org.apache.commons.math3.linear SparseRealMatrix getEntry.

Prototype

double getEntry(int row, int column) throws OutOfRangeException;

Source Link

Document

Get the entry in the specified row and column.

Usage

From source file:edu.byu.nlp.util.asserts.MoreAsserts.java

public static void assertSparseMatricesEqual(final SparseRealMatrix actual, final SparseRealMatrix expected) {
    Preconditions.checkNotNull(actual);//from  w  ww  .  j  a  va 2 s .co m
    Preconditions.checkNotNull(expected);
    Preconditions.checkArgument(actual.getRowDimension() == expected.getRowDimension());

    // check densely--this doesn't need to be fast
    for (int r = 0; r < actual.getRowDimension(); r++) {
        for (int c = 0; c < actual.getColumnDimension(); c++) {
            double act = actual.getEntry(r, c);
            double exp = expected.getEntry(r, c);
            if (act != exp) {
                System.err.println("actual[" + r + "][" + c + "]=" + act + " does not match expected[" + r
                        + "][" + c + "]=" + exp);
            }
            Assertions.assertThat(act).isEqualTo(exp);
        }
    }
}

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From source file:simrankapp.SimRankAlgorithm.java

/**
     * Compute the sum of all SimRank values of all incoming
     * neighbors of the given vertices//from w w  w.  j av a2s .  co  m
             
     */
private static <V> float computeSum(Graph<V, ?> g, V a, V b, SparseRealMatrix simRank) {
    Collection<V> ia = g.getPredecessors(a);
    Collection<V> ib = g.getPredecessors(b);
    float sum = 0;
    for (V iia : ia) {
        for (V ijb : ib) {
            int i = Integer.valueOf(String.valueOf(iia));
            int j = Integer.valueOf(String.valueOf(ijb));
            Float r = (float) simRank.getEntry(i, j);
            sum += r;
        }
    }
    return sum;
}

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From source file:simrankapp.util.ReaderWriterUtil.java

public static void writeSimRankInDB(SparseRealMatrix simRankMatrix) {
    Connection con = null;//from  w w  w . j a v a 2 s.  c  o m
    PreparedStatement stmt = null;
    try {
        Class.forName(TheCrawlersConstants.JDBC_DRIVER);
        System.out.println("Connecting to a selected database...");
        con = DriverManager.getConnection(TheCrawlersConstants.DB_URL, TheCrawlersConstants.DB_USERNAME,
                TheCrawlersConstants.DB_PASSWORD);
        System.out.println("Connected database successfully...");
        stmt = con.prepareStatement(TheCrawlersConstants.INSERT_SIMRANK_SQL);
        int numNodes = simRankMatrix.getRowDimension();
        for (int row = 0; row < numNodes; row++) {
            for (int col = 0; col < numNodes; col++) {
                double value = simRankMatrix.getEntry(row, col);
                if (value > 0) {
                    stmt.setInt(1, row);
                    stmt.setInt(2, col);
                    stmt.setDouble(3, value);
                    stmt.addBatch();
                }
            }
        }
        stmt.executeBatch();

    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            stmt.close();
            con.close();
        } catch (Exception e) {
        }
    }
}

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From source file:simrankapp.util.ReaderWriterUtil.java

public static void writeSimRankToFile(SparseRealMatrix simRankMatrix, String simRankPath) {
    int numNodes = simRankMatrix.getRowDimension();
    try {//  w ww  .  ja v  a2  s  . c o  m
        BufferedWriter bw = new BufferedWriter(new FileWriter(new File(simRankPath)));
        // row == col is always 1
        // row > col is symmetric and is equal to row < col
        for (int col = 0; col < numNodes; col++) {
            for (int row = 0; row < numNodes; row++) {
                double value = simRankMatrix.getEntry(row, col);
                bw.write(row + " " + col + " " + value);
                bw.newLine();
            }
        }
        bw.close();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

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From source file:simrankapp.util.ReaderWriterUtil.java

public static void writeSparseMatrix(SparseRealMatrix matrix, String Path) {
    int numNodes = matrix.getRowDimension();
    try {/*from  ww  w  .jav  a  2 s  .co m*/
        BufferedWriter bw = new BufferedWriter(new FileWriter(new File(Path)));
        // row == col is always 1
        // row > col is symmetric and is equal to row < col
        for (int col = 0; col < numNodes; col++)
            for (int row = 0; row < numNodes; row++) {
                double value = matrix.getEntry(row, col);
                bw.write(row + " " + col + " " + value);
                bw.newLine();
            }
        bw.close();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

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