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Re: Random function [message #180546 is a reply to message #180545]

Mon, 25 February 2013 21:13

Luuk
Messages: 329
Registered: September 2010

Karma:

Senior Member

On 25-02-2013 21:57, Salvatore wrote:
> On 2013-02-25, sonnichjensen(at)gmail(dot)com <sonnichjensen(at)gmail(dot)com> wrote:
>> Hi
>>
>> I use the rand function to get 10 items of 1808 current itemes. I tried some 50 times or so and I can clearly see that it has a few "faivourite numbers" which comes all the time, and some whihc I still have to see (I am talking about large groups of items from the 1808 picture, that I still have to see)
>>
>> How I can get a better random function?
>
> Try mt_rand().
>

file: rand.php
<?php
for ($x=1; $x<=180800; $x++) {
echo mt_rand(1,1808)."\n";
}
?>

bash:
$ php -f rand.php | sort | uniq -c | awk 'BEGIN {m=9999; r=0; }{ if
($1<m) { m=$1; }; if ($1>r) { r=$1; }} END{ print m,r; }'
72 134

This means that some number only was picked 72 times,
and another number was picked 134 times......

$ php -version
PHP 5.3.8 (cli)
Copyright (c) 1997-2011 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2011 Zend Technologies

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[Message index]

		Random function By: Sonnich Jensen on Mon, 25 February 2013 20:48
		Re: Random function By: Salvatore on Mon, 25 February 2013 20:57
		Re: Random function By: Luuk on Mon, 25 February 2013 21:13
		Re: Random function By: Jerry Stuckle on Mon, 25 February 2013 21:42
		Re: Random function By: The Natural Philosoph on Mon, 25 February 2013 22:12
		Re: Random function By: Robert Heller on Tue, 26 February 2013 01:46
		Re: Random function By: Jerry Stuckle on Mon, 25 February 2013 21:39
		Re: Random function By: The Natural Philosoph on Mon, 25 February 2013 22:11
		Re: Random function By: Salvatore on Mon, 25 February 2013 22:42
		Re: Random function By: M. Strobel on Tue, 26 February 2013 10:18
		Re: Random function By: Paul Herber on Tue, 26 February 2013 13:52
		Re: Random function By: Markus Grob on Wed, 27 February 2013 11:17
		Re: Random function By: Thomas 'PointedEars' on Wed, 27 February 2013 23:22

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