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Hi everyone, I ve been using R for months and find it really practical and straight forward. However (the inevitable however), I am finding it very slow for one of my operations: it s basically an itertation over i and j in a pretty big table (4* 4608). It takes 30 minutes!!!! Thanks Ps:if it can help here is the source: median1<-matrix(nrow=4608,ncol=1) median2<-matrix(nrow=4608,ncol=1) median3<-matrix(nrow=4608,ncol=1) median4<-matrix(nrow=4608,ncol=1) v<-c(18,19,20,21,23) for (i i...

I have some geospatial data where two layers are thematic and the third is a percentage, so the maps need to have different themes. thumbDf <- as( stack( thumb), "SpatialGridDataFrame") names(thumbDf at data) <- c("pri", "sec", "pct") thumbDf at data$pri <- factor(thumbDf at data$pri, levels=c(0:8), labels= names( peelClasses)) thumbDf at