I see that plot.default uses deparse(substitute(x)) to extract the
character name of an argument and put it on the vertical axis.
Hence:
foo <- 1:10
plot( foo )
will put the label "foo" on the vertical axis.
However, for a function that takes a "..." list as an input, I can only
extract the first argument name:
x <- 1:10
y <- 10:20
foo <- function(...) {
print(deparse(substitute(...)))
}
foo(x,y)
returns:
> foo(x,y)
[1] "x"
>
and when I try to convert the list to a local variable and then extract
names, that doesn't work either:
x <- 1:10
y <- 10:20
foo <- function(...) {
x <- list(...)
print(deparse(substitute(names(x))))
}
foo(x,y)
returns:
> foo(x,y)
[1] "names(list(c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10), c(10, 11, 12, 13, "
[2] "14, 15, 16, 17, 18, 19, 20)))"
>
Can someone suggest a way to extract the variable names when they are
passed as a list via "..." ?
Thanks,
Whit
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