[PD] variance from mapping library

[Mathieu Bouchard]

On Mon, 23 Mar 2009, Mathieu Bouchard wrote:

> You can send simple repeated sequences to [mapping/variance] to show that not 
> only it can drift in the negative values almost endlessly, but it doesn't 
> even compute the variance of N values.

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.

#N canvas 744 170 273 272 10;
#X obj 39 33 inlet;
#X obj 39 184 outlet;
#X obj 39 52 t f f;
#X obj 39 165 -;
#X obj 39 83 t f f;
#X obj 39 111 *;
#X obj 39 130 mean_n \$1;
#X obj 114 81 mean_n \$1;
#X obj 114 101 t f f;
#X obj 114 129 *;
#X connect 0 0 2 0;
#X connect 2 0 4 0;
#X connect 2 1 7 0;
#X connect 3 0 1 0;
#X connect 4 0 5 0;
#X connect 4 1 5 1;
#X connect 5 0 6 0;
#X connect 6 0 3 0;
#X connect 7 0 8 0;
#X connect 8 0 9 0;
#X connect 8 1 9 1;
#X connect 9 0 3 1;

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