[R] Setting Values of Elements in a Dataframe
Dear All, I am experiencing some problems in resetting the values of some selected elements in a dataframe. Consider d-seq(-1,1,length=16) dim(d)-c(4,4) d-as.data.frame(d) sel_pos-which(d0, arr.ind=TRUE) d[sel_pos]- -9 which returns the error Error in `[-.data.frame`(`*tmp*`, sel_pos, value = -9) : only logical matrix subscripts are allowed in replacement which is obscure to me. I am correctly selecting the positive elements in a data.frame and I'd like to reset them to another numerical value. What I am misunderstanding? Many thanks Lorenzo __ 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.
Re: [R] Setting Values of Elements in a Dataframe
Try this: d[d 0] - -9 On Mon, Nov 29, 2010 at 1:56 PM, Lorenzo Isella lorenzo.ise...@gmail.comwrote: Dear All, I am experiencing some problems in resetting the values of some selected elements in a dataframe. Consider d-seq(-1,1,length=16) dim(d)-c(4,4) d-as.data.frame(d) sel_pos-which(d0, arr.ind=TRUE) d[sel_pos]- -9 which returns the error Error in `[-.data.frame`(`*tmp*`, sel_pos, value = -9) : only logical matrix subscripts are allowed in replacement which is obscure to me. I am correctly selecting the positive elements in a data.frame and I'd like to reset them to another numerical value. What I am misunderstanding? Many thanks Lorenzo __ 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. -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40 S 49° 16' 22 O [[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.
Re: [R] Setting Values of Elements in a Dataframe
Hi, Not sure why it doesn't work (I would say it's because of the structure of sel_pos, but I don't know how to deal with it). But just do: d[d0] - -9 It does work HTH, Ivan Le 11/29/2010 16:56, Lorenzo Isella a écrit : Dear All, I am experiencing some problems in resetting the values of some selected elements in a dataframe. Consider d-seq(-1,1,length=16) dim(d)-c(4,4) d-as.data.frame(d) sel_pos-which(d0, arr.ind=TRUE) d[sel_pos]- -9 which returns the error Error in `[-.data.frame`(`*tmp*`, sel_pos, value = -9) : only logical matrix subscripts are allowed in replacement which is obscure to me. I am correctly selecting the positive elements in a data.frame and I'd like to reset them to another numerical value. What I am misunderstanding? Many thanks Lorenzo __ 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. -- Ivan CALANDRA PhD Student University of Hamburg Biozentrum Grindel und Zoologisches Museum Abt. Säugetiere Martin-Luther-King-Platz 3 D-20146 Hamburg, GERMANY +49(0)40 42838 6231 ivan.calan...@uni-hamburg.de ** http://www.for771.uni-bonn.de http://webapp5.rrz.uni-hamburg.de/mammals/eng/1525_8_1.php __ 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.
