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;
}
}
?>
stats_rand_gen_normal
(PECL stats >= 1.0.0)
stats_rand_gen_normal — Generates a single random deviate from a normal distribution
Description
Returns a random deviate from the normal distribution with mean, av, and standard deviation,
sd.
Liste de paramètres
-
av -
The mean of the normal distribution
-
sd -
The standard deviation of the normal distribution
Valeurs de retour
A random deviate
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User Contributed Notes 1 note
KEINOS ¶
4 years ago
