[R] Centre of gravity of a mountain

Ab Hu master.rstat at yahoo.com
Mon Nov 8 18:07:45 CET 2010

Hi all,
I have a matrix of a mountain of form 21x21 and values in them are height
(Z). Using the persp function I can view this mountain in 3D. 
Now, I am trying to find a measure to find the centre of gravity (maybe
centroid?) of this mountain. Any idea what would be the best way to go?
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