Hello, I have a variable named 'x' defined inside a function, which may conflict with a variable name supplied in the argument to the function. What is the best practice to avoid this conflict?
foo <- function(df) { x <- df[, 1, drop = FALSE] dfOut <- data.frame(df, x) dfOut } Data <- data.frame(x = c(1, 2), y = c(3, 4)) foo(Data) x y x.1 1 1 3 1 2 2 4 2 The following solution doesn't look nice to me… foo <- function(df) { if (any(names(df) == 'x')) stop("x cannot be a variable name in the data frame") x <- df[, 1, drop = FALSE] dfOut <- data.frame(df, x) dfOut } Thanks! Axel. [[alternative HTML version deleted]] ______________________________________________ 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.