calculate Deviation - Java java.lang

Java examples for java.lang:Math Algorithm

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Description

calculate Deviation

Demo Code

/*//from  w w w .jav  a2 s. com
 * Copyright (c) 2010-2012 Grid Dynamics Consulting Services, Inc, All Rights Reserved
 * http://www.griddynamics.com
 *
 * This library is free software; you can redistribute it and/or modify it under the terms of
 * the GNU Lesser General Public License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER OR CONTRIBUTORS 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.
 */
//package com.java2s;
import java.math.BigDecimal;

public class Main {
    public static void main(String[] argv) throws Exception {
        BigDecimal v1 = new BigDecimal("1234");
        BigDecimal v2 = new BigDecimal("1234");
        System.out.println(calculateDeviation(v1, v2));
    }

    public static double calculateDeviation(BigDecimal v1, BigDecimal v2) {

        if (v1 == null || v2 == null) {
            return 0;
        }

        double dv1 = v1.doubleValue();
        double dv2 = v2.doubleValue();

        return calculateDeviation(dv1, dv2);
    }

    public static double calculateDeviation(double dv1, double dv2) {
        double ratio;
        if (Double.compare(dv2, 0) == 0) {
            if (!(Double.compare(dv1, 0) == 0)) {
                ratio = Double.POSITIVE_INFINITY;
            } else {
                ratio = 1.0;
            }
        } else {
            ratio = Math.abs(dv1 / dv2);
        }

        if (Double.compare(ratio, 1.0) == 0) {
            return 0;
        }

        return ratio - 1;
    }
}

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