[postgis-users] median center instead of st_centroid

[Steve.Toutant at inspq.qc.ca]

Hi,
I used st_centroid on a multipoint table to get the mean center.
I would like to compare the result on the median center
http://en.wikipedia.org/wiki/Center_of_population#Mean_center

Is there already an operator in postgis that does that?

Otherwise I would like to write one, but I don't have much experience 
doing that, so any tips on how to do that well would be appreciated
Thanks in advace for your help!

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