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.
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
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--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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