[PD] variance from mapping library

[Mathieu Bouchard]

On Mon, 23 Mar 2009, Mathieu Bouchard wrote:

> Here is another patch. I call it [mapping/variance2]. It computes a moving 
> variance using exactly the $1 last values and not any more than that. It has 
> more rounding error, but it doesn't have any unwanted delay between the two 
> moving averages used in computing variance.

Well actually, my [mapping/variance2] also doesn't have the same drift 
characteristics (nor other error characteristics) as [mapping/variance], 
so, my examples about [mapping/variance] don't drift when remade with 
[mapping/variance2], but some other examples (that I didn't show) are 
worse with [mapping/variance2].

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