Is it possible with pixmap library or image options?
Thank you again for your help.
If you have NA values in a matrix, they will be transparent when you use image() with the add=T option.
Example:
> #make a matrix with all numbers, and show it:
> z=matrix(outer(1:10,1:10,"*"),10,10) > image(z)
> # now set anything over 50 to be NA > z[z>50] = NA
> # plot some points, then add the image, showing the NA region to be see-thru:
> plot(runif(1000),runif(1000))
> image(z,add=T)
Note that you cant have partial transparency - its all or nothing.
Baz
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