Re: [PHP] help with Log() function

From: Jason Wong (php-general_at_gremlins.biz)
Date: 11/29/03 

To: php-general@lists.php.net
Date: Sat, 29 Nov 2003 14:46:26 +0800

On Saturday 29 November 2003 06:03, Jon King wrote:

> I'm having trouble getting a log formula to work. This forumla is supposed
> to return the number of payment required zero out a loan balance.

> print -(log(1-($B/$m)*($r/$q)))/log(1+($r/$q));

> It keeps returning a NaN. I've checked the syntax over and over, but to no
> avail.

Breakup your calculation into little steps to see where your error lies. Have
to tried entering the above calculation into a real calculator? I believe
your problem is that you cannot log() a negative number. 

-- 
Jason Wong -> Gremlins Associates -> www.gremlins.biz
Open Source Software Systems Integrators
* Web Design & Hosting * Internet & Intranet Applications Development *
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