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colour by z value, persp in raster package
3 messages · David Winsemius, Omphalodes Verna
On Feb 28, 2012, at 4:34 AM, Omphalodes Verna wrote:
Hi all! My question is how to colour pixels by z value in persp plot in raster package. Here is an example: x <- seq(-1.95, 1.95, length = 30) y <- seq(-1.95, 1.95, length = 35) z <- outer(x, y, function(a,b) a*b^2) r1 <- raster(nrows=35, ncols=30, xmn=0, xmx=30, ymn = 0, ymx = 35) r1[] <- c(z) persp(r1) There already exist some function to produce persp plot for anothe classes, but I have no idea how deal with RasterLayer object.
Is that really an example? After going to the trouble of correcting the error in this code from failing to load the raster package, I now see that there is no connection between the values of x, y, or x with the raster-call. > r1[] <- as.matrix(z) Error in .local(x, values) : cannot use a matrix with these dimensions Error in .local(x, i, j, ..., value) : cannot replace values on this raster (it is too large > persp(r1) Error: hasValues(x) is not TRUE # Post some useful code.
David Winsemius, MD Heritage Laboratories West Hartford, CT
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