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Any way to get read.table.ffdf() (in the ff package) to pass colClasses or comment.char parameters through to read.fwf() ?
2012 Sep 14
1
Any way to get read.table.ffdf() (in the ff package) to pass colClasses or comment.char parameters through to read.fwf() ?
...a slightly modified version of the documentation) x <- data.frame(log=rep(c(FALSE, TRUE), length.out=26), int=1:26, dbl=1:26 + 0.1, fac=factor(letters), ord=ordered(LETTERS), dct=Sys.time()+1:26, dat=seq(as.Date("1910/1/1"), length.out=26, by=1)) x <- x[c(13:1, 13:1),] csvfile <- tempPathFile(path=getOption("fftempdir"), extension="csv") write.csv(x, file=csvfile, row.names=FALSE) y <- read.csv(file=csvfile, header=TRUE, colClasses=c(dct="POSIXct", dat="Date")) # "ordered" gives an error ffx <- read.csv.ffdf(file=csvfile, header=...