search for: 0000ff22

...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

Dear R graphics experts, Do you know of any way of plotting semi-transparent points in R ? I face this problem any time I want to e.g. plot thousands of points that belong to two or three classes which I color code. With the default opaque colors, the plotting order matters and basically the points I plot last completely dominate the picture. I would much rather have the overlaying points