Although I had versions of the 2-D polygon centroid algorithm written in C and Fortran years ago, I can't find them today. The formula can be found at http://astronomy.swin.edu.au/~pbourke/geometry/polyarea/. Functions for calculating polygon area in R package "splancs" (function areapl) or in R package "tripack" (function voronoi.area), might be adaptable.
> I am searching for a utility in R which will determine the mean location of > a closed contour and eventually record the location in an ASCII file. By > means of the contour utility in R, I am able to produce an image of a contour, > but I am seeking a procedure which will produce the coordinates of the > center of mass of the contour. From my actual set of data, the contour > utility will produce several hundered closed non-intersecting and > non-concentric contours like a lattice of disks. I want the location of > those disks via a program. Is there any package in R which will lend > itself to this problem? ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
