Gets a sub-matrix within the given matrix - Java java.lang

Java examples for java.lang:Math Matrix

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Description

Gets a sub-matrix within the given matrix

Demo Code

/**/*  w  w  w .j  a v a 2  s.c  o m*/
 * MatrixHelper.java
 * 
 * Revision History:<br>
 * Jan 14, 2009 bpaulson - File created
 * 
 * <p>
 * 
 * <pre>
 * This work is released under the BSD License:
 * (C) 2008 Sketch Recognition Lab, Texas A&amp;M University (hereafter SRL @ TAMU)
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Sketch Recognition Lab, Texas A&amp;M University 
 *       nor the names of its contributors may be used to endorse or promote 
 *       products derived from this software without specific prior written 
 *       permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY SRL @ TAMU ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL SRL @ TAMU BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * </pre>
 */
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import Jama.Matrix;

public class Main{
    /**
     * Gets a sub-matrix within the given matrix
     * 
     * @param m
     *            matrix to get a sub-matrix from
     * @param rows
     *            row numbers to get
     * @param cols
     *            column numbers to get
     * @return sub-matrix containing only the specified rows and columns
     */
    public static Matrix subMatrix(Matrix m, List<Integer> rows,
            List<Integer> cols) {
        Matrix newM = new Matrix(rows.size(), cols.size());
        for (int r = 0; r < rows.size(); r++)
            for (int c = 0; c < cols.size(); c++)
                newM.set(r, c, m.get(rows.get(r), cols.get(c)));
        return newM;
    }
}

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