| match.call {base} | R Documentation |
match.call returns a call in which all of the specified arguments are
specified by their full names.
match.call(definition = NULL, call = sys.call(sys.parent()),
expand.dots = TRUE)
definition |
a function, by default the function from which
match.call is called. |
call |
an unevaluated call to the function specified by
definition, as generated by call. |
expand.dots |
logical. Should arguments matching ...
in the call be included or left as a ... argument? |
match.call is most commonly used in two circumstamces:
call of
the list they return. Here the default expand.dots = TRUE
is appropriate.
model.frame. Here the common idiom is that
expand.dots = FALSE is used, and the ... elememt
of the matched call is removed. An alternative is to
explicitly select the arguments to be passed on, as is done in
lm.
An object of class call.
Chambers, J. M. (1998) Programming with Data. A Guide to the S Language. Springer.
call, pmatch, match.arg,
match.fun.
match.call(get, call("get", "abc", i = FALSE, p = 3))
## -> get(x = "abc", pos = 3, inherits = FALSE)
fun <- function(x, lower = 0, upper = 1) {
structure((x - lower) / (upper - lower), CALL = match.call())
}
fun(4 * atan(1), u = pi)