Thank you very much for your help, I was wondering if is possible to sample randomly specifying to select in a particular group of data inside the matrix, for example only within the whole samples collected in 2011 I would randomly choose 20 random samples...
Thanks a again, Gian On 13 September 2012 12:26, anna freni sterrantino <annafr...@yahoo.it>wrote: > Hello Gian, > sure sample function > will do it for your sampling. > > a=as.data.frame(matrix(1:20,4)) > sample(rownames(a),2) > > see ?sample for more details. > Hope it helps > > Cheers > > Anna > > > Anna Freni Sterrantino > Department of Statistics > University of Bologna, Italy > via Belle Arti 41, 40124 BO. > ------------------------------ > *Da:* Gian Maria Niccolò Benucci <gian.benu...@gmail.com> > *A:* r-help@r-project.org > *Inviato:* Giovedì 13 Settembre 2012 10:42 > *Oggetto:* [R] random sampling inside a dataset > > Hi all, > > I am wondering if do exist a function in R that allow me to sample or > choose randomly the rows (i.e., samples) inside a given matrix. > Thank you very much in advance. > Cheers, > > -- > Gian > > [[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<http://www.r-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > > > -- Gian Maria Niccolò Benucci, PhD Department of Applied Biology University of Perugia Borgo XX Giugno, 74 06121 - Perugia, ITALY *----- Do not print this email unless you really need to. Save paper and protect the environment! -----* [[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.
