function (x) { 5-4.5*abs(x-50)/50 }

I think...

-- 
Tek
http://evilsuperbrain.com

"Chrisir" <nomail@nomail> wrote in message 
news:web.45317c2b6ccf04ff15b159e0@news.povray.org...
>
>
> Hello!
>
> I am having problems with my maths here.
>
> I need a function f(index) that for my index going from 0 to 100 (so it's:
> 0,1,2,3,4...99,100) returns the values between 0.5 and 5 for index between
> 0 and 50 and then between 5 and 0.5 back again for index between 50 and
> 100.
>
> So the return value goes for example 0.5, 0.7, 1, 1.3...5, 4.8,4.2....0.5
>
> Thank you very much!
>
> Greetings,
>
> Chrisir
>
>
>
>
>

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