note 33803 added to function.mt-rand
| From: | daeken_9999 at yahoo dot com | Date: | Tue, 08 Jul 2003 07:44:15 +0000 |
| Subject: | note 33803 added to function.mt-rand | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-51678@lists.php.net to get a copy of this message | ||
This is a fixed version of the gaussrand() function defined in a note above.
<?php
function gaussrand()
{
static $V2, $V1, $S;
static $phase = 0;
if (phase == 0)
{
while ($S >= 1 || $S == 0)
{
$V1 = 2 * (rand() / getrandmax()) - 1;
$V2 = 2 * (rand() / getrandmax()) - 1;
$S = $V1 * $V1 + $V2 * $V2;
}
$X = $V1 * sqrt(-2 * log($S) / $S);
}
else
$X = $V2 * sqrt(-2 * log($S) / $S);
$phase = 1 - $phase;
return $X;
}
?>
----
Manual Page -- http://www.php.net/manual/en/function.mt-rand.php
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