> http://www.wolframalpha.com/input/?i=%28e^-6.3%29%2810^x%29%2Fx!+from+0+to+15
>
> Looking for something f(0)=0,  with a single maximum at medium values, and very
> slowly decays back to zero. The actual diffusion equation (as I remember from
> long ago) would do that.  Like the smell on the opposite side of a room after
> you open bottle. (Want it for my flocking formulas).

If you're after something simple, how about x/(x^2+a^2) which will give 
you a peak at "a" and tail off slowly.

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