Hello, this is just a note for new raster plotting support - and only affects users of R for Windows in SDI mode (window application mode- which is not the default install option). It affects both 32- and 64-bit R on Windows.
The behaviour is a bit weird and subtle, so this should only be of interest to Windows users in SDI, and only for the interactive default windows() device as far as I can tell. image.SpatialGridDataFrame now uses the base graphics function rasterImage() by default - this change was added for sp_0.9-64, and this allows for quite large (up to available memory capacity) SpatialGrids to be plotted efficiently with image(x). However, in SDI mode a fresh R session seems only to support five uses of rasterImage() that are drawn to a new device - the sixth and subsequent draws make no visible difference - until the device is manually resized. The problem cannot be reproduced in a single windows() session. To reproduce, in a fresh R session (Windows > 2.11.0 in SDI mode): ## create a dummy dataset m<- matrix(c(0.2, 0.4, 0.6, 0.8), 2, 2) ## simple helper function to open the windows() device and plot the matrix draw.f<- function(x) { plot(0, xlim = c(0, 1), ylim = c(0, 1)) rasterImage(x, 0, 0, 1, 1, interpolate = FALSE) } draw.f(m) ## repeat the following 2 lines five times: dev.off() draw.f(m) On the fifth attempt, only the background plot appears - but the raster is visible on resize of the windows() device. I sent this to Paul Murrell, and with Duncan Murdoch he isolated it to the SDI mode of Windows. I don't know that there is any prospect of a fix - presumably it is rather deep down in the graphics code for Windows, but this note might save some frustation. If anyone can offer more information to track down where the problem is coming from that would be good. Cheers, Mike. R version 2.11.1 (2010-05-31) x86_64-pc-mingw32 locale: [1] LC_COLLATE=English_Australia.1252 LC_CTYPE=English_Australia.1252 [3] LC_MONETARY=English_Australia.1252 LC_NUMERIC=C [5] LC_TIME=English_Australia.1252 attached base packages: [1] tools stats graphics grDevices utils datasets methods [8] base -- Michael Sumner Institute for Marine and Antarctic Studies, University of Tasmania Hobart, Australia e-mail: mdsum...@gmail.com _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo