stats_rand_gen_normal

    (PECL stats >= 1.0.0)

    stats_rand_gen_normal — Generates a single random deviate from a normal distribution

    Descrizione

    stats_rand_gen_normal(float $av, float $sd): float

    Returns a random deviate from the normal distribution with mean, av, and standard deviation, sd.

    Elenco dei parametri

    av

    The mean of the normal distribution

    sd

    The standard deviation of the normal distribution

    Valori restituiti

    A random deviate

    Found A Problem?

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes 1 note

    up
    0
    KEINOS
    5 years ago
    Alternative of "stats_rand_gen_normal()".<?php/** * "Box–Muller transform" based random deviate generator. * * @ref https://en.wikipedia.org/wiki/Box%E2%80%93Muller_transform *  * @param  float|int $av Average/Mean * @param  float|int $sd Standard deviation * @return float */if (! function_exists('stats_rand_gen_normal')) {    function stats_rand_gen_normal($av, $sd): float    {        $x = mt_rand() / mt_getrandmax();        $y = mt_rand() / mt_getrandmax();            return sqrt(-2 * log($x)) * cos(2 * pi() * $y) * $sd + $av;    }}?>
    ＋add a note
    To Top