is_nan
Be warned, the function provided by mr dot joebert at gmail dot com has a serious tendency to return $min more often than anything else, especially when $min and $max are close. It also will never return $max if $min is negative. rok kralj gmail com's implementation does not have this problem, as it operates on the difference between $max and $min instead of $max itself.
lcg_value
(PHP 4, PHP 5)
lcg_value — Kombinovaný lineární kongruenční generátor
Popis
float lcg_value ( void )lcg_value() vrátí pseudonáhodné číslo v rozmezí (0, 1). Funkce kombinuje dva kongruenční generátory s periodou 2^31 - 85 a 2^31 - 249. Perioda této funkce odpovídá součinu obou prvočísel.
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User Contributed Noteslcg_value
jfdsmit at gmail dot com
17-Dec-2007 06:44
17-Dec-2007 06:44
mr dot joebert at gmail dot com
22-Nov-2007 11:20
22-Nov-2007 11:20
<?php
function random_float ($min,$max) {
return max($min, lcg_value() * $max);
}
?>
rok kralj gmail com
05-Jun-2007 08:54
05-Jun-2007 08:54
An elegant way to return random float between two numbers:
<?php
function random_float ($min,$max) {
return ($min+lcg_value()*(abs($max-$min)));
}
?>