[R] a question about box counting

From: Rajarshi Guha <rxg218_at_psu.edu>
Date: Tue 05 Apr 2005 - 04:22:53 EST

  I have a set of x,y data points and each data point lies between (0,0) and (1,1). Of this set I have selected all those that lie in the lower triangle (of the plot of these points).

What I would like to do is to divide the region (0,0) to (1,1) into cells of say, side = 0.01 and then count the number of cells that contain a point.

My first approach is to generate the coordinates of these cells and then loop over the point list to see whether a point lies in a cell or not.

However this seems to be very inefficient esepcially since I will have 1000's of points.

Has anybody dealt with this type of problem and are there routines to handle it?

Rajarshi Guha <rxg218_at_psu.edu> <http://jijo.cjb.net> GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE

Alone, adj.: In bad company.
-- Ambrose Bierce, "The Devil's Dictionary"

R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Apr 05 04:28:51 2005

This archive was generated by hypermail 2.1.8 : Fri 03 Mar 2006 - 03:31:01 EST