[PD] Generate a Gaussian curve

[Claude Heiland-Allen]

Hi Liam,

On 17/04/16 07:52, Liam Goodacre wrote:
> Hi all
>
> This is basically just a maths problem. I'm looking to fill an array with a  Gaussian curve and be able to control the sigma value (and any other relevant variables), but my math skills aren't good enough! I tried this, based off of the standard function listed on Wikipedia:
>
> expr $f2 * pow (2.71828, -(($f1-$f3)^2/(2*$f4^2)))

I think in expr, ^ means bitwise xor instead of power.  I'd rewrite it as:

expr $f2*exp(-($f1-$f3)*($f1-$f3)/(2*$f4*$f4))

>
> but there must be a mistake because I'm not getting the right curve.
>
> Can anyone help?
>
> (NB: The point is to find a replacement for the [gauss] external, using the nice new [array random] function).
>
> Liam


Claude
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