Please find below my command inputs, subsequent outputs and errors that I've been receiving.
> crops <- read.table("crop2000AD.asc", colClasses = "numeric", na="-9999") > str(crops[1:10]) 'data.frame': 2160 obs. of 10 variables: $ V1 : num NA NA NA NA NA NA NA NA NA NA ... $ V2 : num NA NA NA NA NA NA NA NA NA NA ... $ V3 : num NA NA NA NA NA NA NA NA NA NA ... $ V4 : num NA NA NA NA NA NA NA NA NA NA ... $ V5 : num NA NA NA NA NA NA NA NA NA NA ... $ V6 : num NA NA NA NA NA NA NA NA NA NA ... $ V7 : num NA NA NA NA NA NA NA NA NA NA ... $ V8 : num NA NA NA NA NA NA NA NA NA NA ... $ V9 : num NA NA NA NA NA NA NA NA NA NA ... $ V10: num NA NA NA NA NA NA NA NA NA NA ... Don't worry about all the NAs - this is because there is no data available at the poles of the Earth (at the top and bottom of the dataset). > min.5 <- 5/60 > dim(crops) [1] 2160 4320 > n <- 2160*4320 > memory.limit() [1] 382.9844 > crops <- cbind(interval=seq(0, by=min.5, length=n), value=runif(n)) Error: cannot allocate vector of size 142.4 Mb In addition: Warning messages: 1: In cbind(interval = seq(0, by = min.5, length = n), value = runif(n)) : Reached total allocation of 382Mb: see help(memory.size) 2: In cbind(interval = seq(0, by = min.5, length = n), value = runif(n)) : Reached total allocation of 382Mb: see help(memory.size) 3: In cbind(interval = seq(0, by = min.5, length = n), value = runif(n)) : Reached total allocation of 382Mb: see help(memory.size) 4: In cbind(interval = seq(0, by = min.5, length = n), value = runif(n)) : Reached total allocation of 382Mb: see help(memory.size) But seems to run when 'value = runif(n)' is excluded.... > crops <- cbind(interval=seq(0, by=min.5, length=n)) > head(crops) interval [1,] 0.00000000 [2,] 0.08333333 [3,] 0.16666667 [4,] 0.25000000 [5,] 0.33333333 [6,] 0.41666667 > str(crops[1:10]) num [1:10] 0.0000 0.0833 0.1667 0.2500 0.3333 ... > breaks <- c(seq(min(crops[,'interval']), max(crops[, 'interval']), by=0.5), > Inf) > head(breaks) [1] 0.0 0.5 1.0 1.5 2.0 2.5 > str(breaks) num [1:1555201] 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 ... > myCuts <- cut(crops[, 'interval'], breaks, include.lowest=TRUE) Error: evaluation nested too deeply: infinite recursion / options(expressions=)? In addition: Warning messages: 1: In formatC(breaks, digits = dig, width = 1) : Reached total allocation of 382Mb: see help(memory.size) 2: In formatC(breaks, digits = dig, width = 1) : Reached total allocation of 382Mb: see help(memory.size) > This is as far as I've got because of the above errors I encounter. Any pointers and advice, or if I'm doing something obviously wrong, then please let me know. Thanks again for your help. Steve _________________________________________________________________ 100’s of Nikon cameras to be won with Live Search ______________________________________________ R-help@r-project.org 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.