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In the example: x = rep(c(0,0,1,1),4) y = rep(c(0,1,0,1),4) z = c(1,0,1,0,0,0,1,1,0,1,0,0,1,1,1,1) f = as.factor(c(rep("a",4),rep("b",4),rep("c",4),rep("d",4))) levelplot(z~x+y|f,data.frame(x=x,y=y,z=z,f=f)) I noted that the last ("d") plot remains empty. I guess the reason for this is that the values are constant (1), but I consider it more

Hi, I am generating a beautiful plot with the 'levelplot' function over my square matrix of data. In order to help visualise the data I would like to draw a diagonal line on the matrix. Because the plot is actually a trellis object, I am having difficulty working out how to do this. I have been reading around, but I don't see any easy solution to the problem. (Most of the docs I have