Java List Compare compareVectors(List vectorA, List vectorB)

Description

compare Vectors

License

Open Source License

Declaration

public static void compareVectors(List<Double> vectorA, List<Double> vectorB) 

Method Source Code

//package com.java2s;
/*/*from  w  ww  .j  a  va  2s  .  co  m*/
 * 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.List;

public class Main {
    public static void compareVectors(List<Double> vectorA, List<Double> vectorB) {
        final int rowsA = vectorA.size();
        final int rowsB = vectorB.size();

        if (rowsA != rowsB) {
            throw new RuntimeException(
                    String.format("vector A dimension (%d) differs from dimension of vector B (%d)", rowsA, rowsB));
        }
        for (int y = 0; y < vectorA.size(); y++) {
            double valA = vectorA.get(y);
            double valB = vectorB.get(y);
            if (!compareValues(valA, valB)) {
                throw new RuntimeException(
                        String.format("vector A differs from vector B at (%d): %f, %f", y, valA, valB));
            }
        }
    }

    /**
     * Returns true if the supplied values are (quite) equal.
     */
    public static boolean compareValues(double valA, double valB) {

        final double diff = Math.abs(valA - valB);
        final double relativeDiff = Math.abs((valA - valB) / (valA + valB));
        return (diff < 0.00000000001) || Double.isNaN(relativeDiff) || (relativeDiff < 0.015); // TODO get rid of magic values, and possibly make them configurable
    }
}

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