hi all, i have a simple scatter plot, and i'd like to make it so the scatter plot colors are slightly transparent. i see in a previous post that someone mentioned the "alpha" parameter, but i am not sure how it can be used with the 'plot' function [*].
for example, suppose i have: plot(mydata$column1, mydata$column2, col="red", cex=1) i now want to make it so the color of these points (in this case red) is slightly transparent, which will make overlap between them very obvious. i realize that hexbin and other density plot methods are used to make this, but i am using it for a different purpose, and so i just want the points to be transparent without any binning or shading. a previous poster suggested: plot( rnorm(1000), rnorm(1000), col="#0000ff22", pch=16,cex=3) but i don't understand this color notation. is there any way to pass in the usual col="colorname" argument and then tweak that color's transparency? thank you. https://stat.ethz.ch/pipermail/r-help/2007-October/142934.html ______________________________________________ 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.