2012/12/5 glenpaling <slp5591 at me.com>:
> I add these two methods to the math functions protocol of the Collections
> class:
>
> variance
>
>         ^(self - self average) squared average
>
> and
>
> standardDeviation
>
>         ^self variance sqrt.
>
> Be careful with large collections integers as these methods will invoke
> fraction arithmetic which is rather slow. In most cases it would be better
> to force floating point.
>
>

No, IMO the library shouldn't force anything but let the decision to the sender.
Such information has a place in documentation.

Nicolas

>
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