Hi imagine the following situation:
a <- runif(100) plot(a[a>0.5]) plots only the elements in the vector which are larger then 0.5 Now imagine a matrix: b <- matrix(runif(20000), ncol=40, nrow=50) image(b[b>0.5]) Error in image.default(b[b > 0.5]) : argument must be matrix-like Is there a similar way then above to plot an image from the matrix with only the elements larger then 0.5, and the remaining elements equals NA? I know I could do something like image(b, zlim=c(0.5, 1)) but this includes 0.5 in the image, bb <- b bb[bb<=0.5] <- NA image(bb) but this includes an additional assignment. This is not of practical use at the moment - the question came up when preparing a lecture. Rainer -- Rainer M. Krug, Centre of Excellence for Invasion Biology, Stellenbosch University, South Africa [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.