match.call {base}R Documentation

Argument Matching

Description

match.call returns a call in which all of the arguments are specified by their names. The most common use is to get the call of the current function, with all arguments named.

Usage

match.call(definition = NULL, call = sys.call(sys.parent()),
           expand.dots = TRUE)

Arguments

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?

Value

An object of class call.

References

Chambers, J. M. (1998) Programming with Data. A Guide to the S Language. Springer.

See Also

call, pmatch, match.arg, match.fun.

Examples

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)
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