On 7/24/07, Jenny Barnes <[EMAIL PROTECTED]> wrote: > Dear R-Help community, > > I am trying to overlay a single contour line over a correlation plot using > levelplot in the lattice package. These are the two arrays: > > 1) a correlation plot over Africa - so each grid square is a different colour > dependent on correlation - this is in an array: result_cor with dim[465,465] > > 2) a single contour line from a ***different data source*** - this is from > data > related to the p-values for the above correlation plot - I want to overlay > only > the 95% confidence contour. The p-values are stored in an array: > result.p.values > with same dimensions as above. > > I have read about using panel.levelplot and panel.contourplot in the R-help > mailing list but I don't know the right way to call two different data arrays, > can anybody help me please? I appreciate your time and help with this > question.
I can think of a couple of different ways, but the simplest will probably be to compute the single contour beforehand and add it after the standard levelplot using a panel function. E.g., using the 'volcano' data for both matrices: ## you need the explicit x and y arguments because ## the default is different from levelplot. vcl <- contourLines(x = seq_len(nrow(volcano)), y = seq_len(ncol(volcano)), z = volcano, levels = c(172, 182)) levelplot(volcano, add.cl = vcl, panel = function(..., add.cl) { panel.levelplot(...) lapply(add.cl, panel.polygon, border = 'red') }) -Deepayan ______________________________________________ R-help@stat.math.ethz.ch 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.