>-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of Don Armstrong >Sent: Tuesday, March 11, 2003 2:43 PM >To: [EMAIL PROTECTED] >Subject: Re: [R] changing pen mode [or adjusting for >overlapping points?] > > >On Tue, 11 Mar 2003, Spencer Graves wrote: >> plot(1:2, col=1:2) >> >> Is this what you want? > >Unless I'm mistaken, that just alternates which color is set >for each point. > >What I'm looking for is a way to plot two (very large) >separate datasets on the same plot so that you can distinguish >between the two. > >EG: In this plot, http://rzlab.ucr.edu/images/test.png, the >upper left region should be some unique color, so you can see >where the red (currently hidden under the green) stops. > > >Don Armstrong
Don, Based upon that example, the code that I sent in my prior e-mail should work and you may not even need to use jitter() in the points() function call given the density of the scatterplot. You might try it with and without using jitter() to see what makes sense for you. You might also need to decide which set of points to draw first versus second depending upon how they overlap. Finally, you might also consider using the 'cex' argument in both plot() and points(), which can reduce the size of the plotting symbols. The default for par(cex) is 1.0, so you might try smaller values. Hope that helps. Marc Schwartz ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
