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.
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