CENTROID Compute centroid (center of mass) of a set of points.

   PTS = centroid(POINTS)
   PTS = centroid(PTX, PTY)
   Computes the ND-dimensional centroid of a set of points. 
   POINTS is an array with as many rows as the number of points, and as
   many columns as the number of dimensions. 
   PTX and PTY are two column vectors containing coordinates of the
   2-dimensional points.
   The result PTS is a row vector with Nd columns.

   PTS = centroid(POINTS, MASS)
   PTS = centroid(PTX, PTY, MASS)
   Computes center of mass of POINTS, weighted by coefficient MASS.
   POINTS is a Np-by-Nd array, MASS is Np-by-1 array, and PTX and PTY are
   also both Np-by-1 arrays.

   Example:
   pts = [2 2;6 1;6 5;2 4];
   centroid(pts)
   ans =
        4     3

   See Also:
   points2d, polygonCentroid
   
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 Author: David Legland
 e-mail: david.legland@grignon.inra.fr
 created the 07/04/2003.
 Copyright 2010 INRA - Cepia Software Platform.

Package: matgeom