Thank you David for the clarification. You are absolutely right. Best, Jorge
On Fri, Nov 13, 2009 at 9:30 PM, David Winsemius <> wrote: > > On Nov 13, 2009, at 7:46 PM, Jorge Ivan Velez wrote: > > Hi Rachel, >> >> Here is a suggestion: >> >> index <- sample(100) >> mysample <- gly[index, ] >> mysample >> >> > I doubt that was what he was hoping to get (which would be a permutation of > 1:100 rather than a subsample). > > try: > samp <- gly[ sample(nrow(gly), 100), ] > > -- > David > > > See ?sample for more information. >> >> HTH, >> Jorge >> >> >> On Fri, Nov 13, 2009 at 5:20 PM, Hayes, Rachel M <> wrote: >> >> Hi All, >>> >>> >>> >>> I want to take a simple random sample from a large dataset, gly, but I'm >>> getting an error message. Any help? >>> >>> >>> >>> dim(gly) >>> >>> [1] 112371 37 >>> >>> s1 <- sample(gly,100) >>>> >>> >>> Error in `[.data.frame`(x, .Internal(sample(length(x), size, replace, : >>> >>> >>> cannot take a sample larger than the population when 'replace = FALSE' >>> >> > It is not a misleading error once you consider that the length of a > data.frame, which is what you handed to sample(), is the number of columns > rather than the number of rows. Data.frames are lists. > > -- > > David Winsemius, MD > Heritage Laboratories > West Hartford, CT > > [[alternative HTML version deleted]] ______________________________________________ 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.