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/**
 * Copyright (c) 2019, RTE (http://www.rte-france.com)
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 * SPDX-License-Identifier: MPL-2.0
 */
package com.powsybl.openloadflow.equations;

import net.jafama.FastMath;

/**
 * @author Geoffroy Jamgotchian {@literal }
 */
public final class Vectors {

    private Vectors() {
    }

    /**
     * a = a - b
     */
    public static void minus(double[] a, double[] b) {
        if (a.length != b.length) {
            throw new IllegalArgumentException("a and b have different length");
        }
        for (int i = 0; i < a.length; i++) {
            a[i] -= b[i];
        }
    }

    /**
     * a = a + b * c
     */
    public static void plus(double[] a, double[] b, double c) {
        if (a.length != b.length) {
            throw new IllegalArgumentException("a and b have different length");
        }
        for (int i = 0; i < a.length; i++) {
            a[i] += b[i] * c;
        }
    }

    /**
     * a = a * b
     */
    public static void mult(double[] a, double b) {
        for (int i = 0; i < a.length; i++) {
            a[i] = a[i] * b;
        }
    }

    public static double norm2(double[] vector) {
        double norm = 0;
        for (double v : vector) {
            norm += v * v;
        }
        return FastMath.sqrt(norm);
    }
}