Java List Transpose transpose(List> matrix)

Description

transpose

License

Open Source License

Declaration

public static List<List<Double>> transpose(List<List<Double>> matrix) 

Method Source Code

//package com.java2s;
/*//  w w w  .j  a  v a  2s  .c  om
 * Copyright (C) 2013 Universitat Pompeu Fabra
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static List<List<Double>> transpose(List<List<Double>> matrix) {

        List<List<Double>> transposed = new ArrayList<List<Double>>(matrix.get(0).size());

        final int origRows = matrix.get(0).size();
        for (int colIndex = 0; colIndex < origRows; colIndex++) {
            transposed.add(new ArrayList<Double>(matrix.size()));
        }

        for (final List<Double> origColumn : matrix) {
            for (int rowIndex = 0; rowIndex < origColumn.size(); rowIndex++) {
                transposed.get(rowIndex).add(origColumn.get(rowIndex));
            }
        }

        return transposed;
    }
}

Related

1. transpose(List> input)
2. transpose(List> matrix)
3. transpose(List> table)