I forgot to say that I've commented out the line # This does not work. #col <- xx[,"yy"]
Rui Barradas Em 05-12-2016 15:17, Rui Barradas escreveu:
Hello, You don't need xx <- deparse(substitute(...)), since you are passing the data.frame to your function. Just use myfun <- function(frame,var){ [...] # Nor does this work. col <- frame[,yy] print(col) } myfun(mydf,age) myfun(frame = mydf, var = age) [1] 2 3 I can get the name of the dataframe as a text string! [1] "mydf" I can get the name of the column as a text string! [1] "age" [1] 20 34 43 32 21 Hope this helps, Rui Barradas Em 05-12-2016 14:44, John Sorkin escreveu:I am trying to write a function which, when passed the name of a dataframe and the name of a column of the dataframe, will allow me to work on the columns of a dataframe. I can not get my code to work. Please see the code below. Any help in getting the function to work would be appreciated. mydf <- data.frame(id=c(1,2,3,4,5),sex=c("M","M","M","F","F"),age=c(20,34,43,32,21)) mydf class(mydf) myfun <- function(frame,var){ call <- match.call() print(call) indx <- match(c("frame","var"),names(call),nomatch=0) print(indx) if(indx[1]==0) stop("Function called without sufficient arguments!") cat("I can get the name of the dataframe as a text string!\n") xx <- deparse(substitute(frame)) print(xx) cat("I can get the name of the column as a text string!\n") yy <- deparse(substitute(var)) print(yy) # This does not work. col <- xx[,"yy"] # Nor does this work. col <- xx[,yy] print(col) } myfun(mydf,age) John David Sorkin M.D., Ph.D. Professor of Medicine Chief, Biostatistics and Informatics University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone number above prior to faxing) John David Sorkin M.D., Ph.D. Professor of Medicine Chief, Biostatistics and Informatics University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone number above prior to faxing) Confidentiality Statement: This email message, including any attachments, is for ...{{dropped:8}}______________________________________________ R-help@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@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.
