Please use dput() to give a reproducible example: I can make this work on a data frame quite easily --
x <- data.frame(1:10, letters[1:10], rnorm(10)) str(x) print(x) x[sample(nrow(x), 5), ] So it's not a problem with something being a data frame or having factors. Michael On Thu, Mar 8, 2012 at 5:16 AM, Oritteropus <lucasantin...@hotmail.com> wrote: > Thanks, but it doesn't work either, it gives me the same message error. > It works just if my first sample is taken in this way: > > mysample <- sample(1:nrow(MeanA), 20, replace=FALSE) > > However, in this way it sample just the number of rows: > [1] 71 24 12 36 2 39 69 62 43 38 9 44 13 54 50 63 67 66 37 28 > > but not the data inside. I need to sample in this way: > > mysample <- MeanA[sample(1:nrow(MeanA), 20, replace=FALSE),] > > to get a sample like this > > HRkm Mean.mf Mean.mfm Loc Diet Terr > Soc Type Soc.Ter W.cat.0.25 W.cat.0.5 > -2.49 -0.43 2.57 A > O T S D > TS b > 23 -2.05 0.67 T > C N S D > NS A > > This is an example of my dataframe > > -- > View this message in context: > http://r.789695.n4.nabble.com/Sampling-problems-tp4453752p4456048.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. ______________________________________________ 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.
