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Message-ID: <1076400906.4028930abe6f5@hristov.com>
Date: Tue, 10 Feb 2004 10:15:06 +0200
To: Paul Hudson <webjedi@hudzilla.eclipse.co.uk>
Cc: internals@lists.php.net
References: <20040210005241.A2CDB2E3116@mra03.ex.eclipse.net.uk>
In-Reply-To: <20040210005241.A2CDB2E3116@mra03.ex.eclipse.net.uk>
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Subject: Re: [PHP-DEV] FW: [PATCH] Bug #24064: Standard deviation
From: php@hristov.com (Andrey Hristov)

Hi, 
as Derick stated 2 days ago, the problem is not in the extension but in the 
MIME header. The attachment must be text/plain. 
 
Andrey 
 
Quoting Paul Hudson <webjedi@hudzilla.eclipse.co.uk>: 
 
> Er, either the php-internals MARC archive doesn't show all attachments, or 
> my diff file got stripped en route for not having a .txt extension.  I've 
> attached it again, just to make sure. 
>  
>  
> Paul 
> -- 
>  
> -----Original Message----- 
> From: Paul Hudson [mailto:webjedi@hudzilla.eclipse.co.uk]  
> Sent: 10 February 2004 00:30 
> To: 'internals@lists.php.net' 
> Subject: [PATCH] Bug #24064: Standard deviation 
>  
> Hi there, 
>  
> Bug #24064 (submitted by tularis@php.net) requests a standard deviation 
> function for PHP.  I realise that any of you could implement this in 10 
> minutes, but according to the bug database it is still Open so I figured I 
> would give it a try myself! 
>  
> There are probably a dozen errors in the code and/or places where it could 
> be better optimised, but I'm hoping one of you might be able to help with 
> that.  So, the attached diff file implements the function array_std_dev(), 
> to calculate standard deviation using the deviation method. 
>  
> With the function in place, standard deviation is calculated like this: 
>  
> <?php 
>   $scores = array(18,5,7,18,3,2,10); 
>   print array_std_dev($score); 
>   // prints 6.6833125519211 
> ?> 
>  
> My first attempt at implementing this was using an extra array to buffer the 
> deviations - this was more out of curiosity to see how the array stuff 
> works.  Sadly, it caused PHP to segfault and I couldn't figure out why - can 
> any of you help me spot the brain fart?  (I've attached the offending code 
> in bad_stddev_code.txt) 
>  
> Yours, 
>  
>  
> Paul 
>  
> PS: I'm not on the internals list, so I would appreciate it if you would CC 
> me on your reply. 
>