have some data that I would like to add "stippling" to show where it is "important", as they do in the IPCC plots
At the moment I am really struggling with trying to do this in R.
If I make up some test data and plot it:
data <- array(runif(12*6), dim=c(12,6) )
over <- ifelse(data > 0.5, 1, 0 )
image(1:12, 1:6, data)
What I would like to finally do is over-plot some points based on the array "over" on top of the current image.
Any suggestions!??