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Re: Random function [message #180550 is a reply to message #180546]

Mon, 25 February 2013 22:12

The Natural Philosoph
Messages: 993
Registered: September 2010

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Senior Member

On 25/02/13 21:13, Luuk wrote:
> 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......
>
what else do you expoect from a random generator?

>
> $ 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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(in-ep-toc’-ra-cy) – a system of government where the least capable to
lead are elected by the least capable of producing, and where the
members of society least likely to sustain themselves or succeed, are
rewarded with goods and services paid for by the confiscated wealth of a
diminishing number of producers.

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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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