On Mon, 21 Jan 2008, Luca Moiana wrote: > Dear List, > > Here is my problem: > > I wanna run a ggwr on a 9000 records Spatial Points Data Frame using R > on a Windows Machine (Dual processor, 4 GB RAM).
Have you tuned Windows memory use as discussed in the R for Windows FAQ - section 2.9? The binaries are 32-bit, and need to be told how much memory to use when trying to carry out memory intensive work. > > When I try to calculate bandwidth using: > > Sdati14400test.sel > <- ggwr.sel(E14400 ~ V211 + V213 + V240 + V313 + V321 + V322 + V331511 + > LnMPI25l.max + B:A, family = poisson(link = log), data = Sdati14400test, > coords=Sdati14400test.coords, adapt = FALSE, gweight = gwr.gauss, verbose = > TRUE, longlat = FALSE) > > I get a memory allocation error saying that the software is not able to > allocate a 749 Mb memory. > > Any suggestion?? It isn't strictly necessary to use all the observations to find the bandwidth - take a couple of 5% samples and see if the results differ much. > > I can also switch and use the same machine with a 64bit Ubuntu SO. > You can try that, but consider dividing the fit.points up into chunks, and running several R processes when actually fitting the ggwr model. The data points stay the same, but fit subsets of the fit.points in separate processes. ggwr() has not (yet) been adapted for using a cluster, but gwr() has and a snow socket cluster will run happily on Linux there, and since it is run within the function, it concatenates the results before returning. If this would be useful of ggwr(), consider taking a look at the code. Roger > > THANK A LOT > > > > Luca Moiana > > > _________________________________________________________________ > > > [[alternative HTML version deleted]] > > _______________________________________________ > R-sig-Geo mailing list > [email protected] > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > -- Roger Bivand Economic Geography Section, Department of Economics, Norwegian School of Economics and Business Administration, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 e-mail: [EMAIL PROTECTED] _______________________________________________ R-sig-Geo mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-geo
