[PD] variance from mapping library

[cyrille henry]

Mathieu Bouchard a écrit :
> On Thu, 19 Mar 2009, Oded Ben-Tal wrote:
...
> 
> For the "mapping" library, there isn't much of a choice but to remake it 
> with a slower algorithm, unless someone knows a magic trick for 
> cancelling almost all of the error while not running so slow. 

no need to remake an other mean_n object using a beter but slower algorythm.
you just have to send a [mode 1< message to mean_n : it does switch the internal algo used to a more accurate one.

i just add this message to the variance object...

Cyrille