a question about box counting
Perhaps the following, substituting your vectors of x and y for runif(10000)
x<-trunc(100*runif(10000)) y<-trunc(100*runif(10000))/100 length(unique(x+y))
[1] 6390 Ben Fairbank -----Original Message----- From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Rajarshi Guha Sent: Monday, April 04, 2005 1:23 PM To: R Subject: [R] a question about box counting Hi, 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 at 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