Wayne Aldo Gavioli wrote: > > Hello all, > > > I'm trying to graph a scatterplot of a large (5,000 x,y coordinates) of data > with the caveat that many of the data points overlap with each other (share > the > same x AND y coordinates). In using the usual "plot" command, > > > >>plot(education, xlab="etc", ylab="etc") > > > > it seems that the overlap of points is not shown in the graph. Namely, there > are 5,000 points that should be plotted, as I mentioned above, but because so > many of the points overlap with each other exactly, only about 50-60 points > are > actually plotted on the graph. Thus, there's no indication that Point A > shares > its coordinates with 200 other pieces of data and thus is very common while > Point B doesn't share its coordinates with any other pieces of data and thus > isn't common at all. Is there anyway to indicate the frequency of such points > on such a graph? Should I be using a different command than "plot"? > Hi Wayne, While this is not a really pretty picture, you can get a viewable plot with count.overplot if the first two elements of "education" are named "x" and "y" and they are the coordinates you want to plot. Otherwise, pass the x and y coordinates separately.
library(plotrix) count.overplot(education, tol=c(diff(range(education$x))/10, diff(range(education$y))/10)) Jim ______________________________________________ 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.
