[I forgot to keep it on the list.] -------- Weitergeleitete Nachricht -------- Betreff: Re: [R] Concatenation? Datum: Wed, 17 Feb 2021 22:14:13 +0100 Von: Gerrit Eichner <gerrit.eichner at math.uni-giessen.de> Organisation: JLU Gie?en An: Parkhurst, David <parkhurs at indiana.edu> Hi David, checkout, e. g., base-R's paste0(site, depth) or, if stored as columns of a matrix or data frame X, e.g., apply(X, 1, paste0) or, e.g., tidyr's unite. Hth -- Gerrit --------------------------------------------------------------------- Dr. Gerrit Eichner Mathematical Institute, Room 212 gerrit.eichner at math.uni-giessen.de Justus-Liebig-University Giessen Tel: +49-(0)641-99-32104 Arndtstr. 2, 35392 Giessen, Germany Fax: +49-(0)641-99-32109 http://www.uni-giessen.de/eichner --------------------------------------------------------------------- Am 17.02.2021 um 22:09 schrieb Parkhurst, David:> If I have a vector of site abbreviations and a vector of depths in those water bodies, is there a simple way in R to combine them to make a third vector? > Examples: > > site depth desired > MU 0 MU0 > MU 1 MU1 > MU 2 MU2 > MC 0 MC0 > MC 1 MC1 > MC 2 MC2 > > The dataset has many more lines than this.? I can see how to do this with lots of if statements, but does R have magic that can make it happen easily?? I guess this would be called concatenation. > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. >
Inline comment below. Cheers, Bert Bert Gunter ".... or, if stored as columns of a matrix or data frame X, e.g.,> > ##############> apply(X, 1, paste0) >############## " No. paste() is vectorized. apply() can be avoided:> df <- data.frame(X1 = letters[1:3],X2 = 5:7, X3 = LETTERS[1:3] )> dfX1 X2 X3 1 a 5 A 2 b 6 B 3 c 7 C> do.call(paste0, df)[1] "a5A" "b6B" "c7C" Hth -- Gerrit> > --------------------------------------------------------------------- > Dr. Gerrit Eichner Mathematical Institute, Room 212 > gerrit.eichner at math.uni-giessen.de Justus-Liebig-University Giessen > Tel: +49-(0)641-99-32104 Arndtstr. 2, 35392 Giessen, Germany > Fax: +49-(0)641-99-32109 http://www.uni-giessen.de/eichner > --------------------------------------------------------------------- > > Am 17.02.2021 um 22:09 schrieb Parkhurst, David: > > If I have a vector of site abbreviations and a vector of depths in those > water bodies, is there a simple way in R to combine them to make a third > vector? > > Examples: > > > > site depth desired > > MU 0 MU0 > > MU 1 MU1 > > MU 2 MU2 > > MC 0 MC0 > > MC 1 MC1 > > MC 2 MC2 > > > > The dataset has many more lines than this. I can see how to do this > with lots of if statements, but does R have magic that can make it happen > easily? I guess this would be called concatenation. > > > > ______________________________________________ > > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > > 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 at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. >[[alternative HTML version deleted]]