# Re: [PHP] Compution of Fibonacci

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On Tue, 31 Jul 2001, Stig Venaas wrote:

> On Tue, Jul 31, 2001 at 11:59:07AM +0500, Saquib Farooq wrote:
> > hi
> >
> >     well first of all you have to remove the colon -- ";" sign from
> > the end of your while loop ...... that will solve the problem for the time
> > out.
> >     then there is problem with your code, this code will never get you
> > the fibonacci since the variable a,b and c never go abone 0, see. :).
>
> Just in case anyone is interested... If you want to find the n'th
> Fibonacci number and not go through the entires sequence, you can
> use the formula:
>
> F(n) = ( P^n - (-P)^(-n) ) / sqrt(5) where P = (1 + sqrt(5))/2
>
> and it's also possible to extend Fibonacci numbers to negative n.
> Pretty fascinating (:
>
> Also, if you have F(n) you can find F(n+1). Let x denote F(n).
>
> F(n+1) = floor( (x + 1 + sqrt(5x^2)) / 2).
>
> Stig
>
>
Oh please stop that ... you sound like my maths professor :). lol.

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Saquib Farooq Malik
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