Standard Deviation One-liner

[Alain Ketterlin]

Alain Ketterlin <alain at dpt-info.u-strasbg.fr> writes:

> aux = lambda s1,s2,n: (s2 - s1*s1/n)/(n-1)
> sv = lambda d: aux(sum(d),sum(x*x for x in d),len(d))

Err, sorry, the final square root is missing.

-- Alain.