clogb.c

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/*-
 * Copyright (c) 2014-2018 Carsten Sonne Larsen <cs@innolan.net>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 */

#include "prim.h"

/**
 * @brief  Base 2 logarithmic value of complex number
 * @details
 * <pre>
 * lb z = log(z) / log(2)
 * </pre>
 * More info is available at Wikipedia: <BR>
 * https://wikipedia.org/wiki/Complex_logarithm
 */
complex clogb(complex z)
{
    complex two = cpack(2.0, 0.0);
    complex w = cdiv(clog(z), clog(two));
    return w;
}