Java Abs abs2(double[][] IN)

Description

Returns the squared absolute value of a 2d array (complex).

License

Open Source License

Parameter

Parameter	Description
IN	array

Return

square absolute value.

Declaration

public static double[][] abs2(double[][] IN) 

Method Source Code

//package com.java2s;
/*//from w  w  w  . j  a va2s  . com
 * This file is part of TiPi (a Toolkit for Inverse Problems and Imaging)
 * developed by the MitiV project.
 *
 * Copyright (c) 2014 the MiTiV project, http://mitiv.univ-lyon1.fr/
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

public class Main {
    /**
     * Returns the squared absolute value of a 2d array (complex).
     *
     * @param IN array
     * @return square absolute value.
     */
    public static double[][] abs2(double[][] IN) {
        int H = IN.length;
        int W = IN[0].length / 2;
        double[][] OUT = new double[H][W];
        for (int i = 0; i < H; i++) {
            OUT[i] = abs2(IN[i], 1);
        }
        return OUT;
    }

    /**
     * Returns the squared absolute value of 1d array.
     *
     * @param IN array
     * @return square absolute value.
     */
    public static double[] abs2(double[] x, int isComplex) {
        if (isComplex == 1) {
            int L = x.length / 2;
            double[] y = new double[L];
            for (int i = 0; i < L; i++) {
                y[i] = x[2 * i] * x[2 * i] + x[2 * i + 1] * x[2 * i + 1];
            }
            return y;
        } else {
            int L = x.length;
            double[] y = new double[L];
            for (int i = 0; i < L; i++) {
                y[i] = x[i] * x[i];
            }
            return y;
        }
    }

    /**
     * Returns the squared absolute value of 1d array.
     *
     * @param IN array
     * @return square absolute value.
     */
    public static double[] abs2(double[] x, int begin, int end, int isComplex) {
        //TODO regarder taille
        if (isComplex == 1) {
            int L = x.length / 2;
            double[] y = new double[L];
            for (int i = begin; i < end; i++) {
                y[i] = x[2 * i] * x[2 * i] + x[2 * i + 1] * x[2 * i + 1];
            }
            return y;
        } else {
            int L = end - begin + 1;
            double[] y = new double[L];
            for (int i = 0; i < L; i++) {
                y[i] = x[i + begin] * x[i + begin];
            }
            return y;
        }
    }
}

Related

1. abs(int value)
2. abs(int x)
3. abs(long index)
4. Abs(Object in)
5. abs(short x)
6. abs2(float[] f)
7. abs_fractional(double number)
8. abs_min(double a, double b)
9. absAngleDifference(double angle1Radians, double angle2Radians)