Dear Prof. Ripley, Thanks for your reply.
This is one of the main points of supporting semi-transparent colours. > You haven't told us your platform or graphics device (see the posting > guide), but plotting with something like col=rgb(0,0,0,0.2) may work. I am working on Ubuntu Linux. and I tried the suggested approach but got an empty plot and the following warning message: In plot.xy(xy, type, ...) : semi-transparency is not supported on this device: reported only once per page Any suggestions on how to proceed? Many thanks, Aditya > > On Thu, 27 Jan 2011, Aditya Bhagwat wrote: > > Dear all, >> >> When making a plot with the command plot(xVector, yVector), there are many >> points that collide on the same place in the plot. In order to make this >> plot clearer, I have been looking for a way to colour the points based on >> the number of points that fall onto each other. If only one point falls on >> a >> particular location, make it gray, if many points fall, make it black. >> >> I tried to search the help archives, but didn't find any useful answers. >> Anyone has any suggestion? >> >> Many thanks for your help! >> >> Aditya >> >> -- >> Aditya Bhagwat >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide >> http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> >> > -- > Brian D. Ripley, rip...@stats.ox.ac.uk > Professor of Applied Statistics, > http://www.stats.ox.ac.uk/~ripley/<http://www.stats.ox.ac.uk/%7Eripley/> > University of Oxford, Tel: +44 1865 272861 (self) > 1 South Parks Road, +44 1865 272866 (PA) > Oxford OX1 3TG, UK Fax: +44 1865 272595 > -- Aditya Bhagwat [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
