> x <- log(1:10) > y <- log(1:10) > z <- 1:100 > contour(matrix(z,ncol=10)) > did not do what I expected it to do. I expected the contour lines to become compressed gradually. I believe you want to do: contour(x,y,matrix(z,ncol=10)) This will show the desired contour-plot. Kind regards, Darius Blaszijk