Function Calls

Usage

call(name, ...)

is.call(expr)
as.call(expr)

Value

An unevaluated function call, that is, an unevaluated expression which consists of the named function applied to the given arguments (name must be a quoted string which gives the name of a function to be called).

is.call is used to determine whether expr is a call.

It is not possible to coerce objects to mode call (objects either are calls or they are not calls). as.call returns its argument if it is a call and otherwise terminates with an error message.

See Also

do.call for calling a function by name and argument list; Recall for recursive calling of functions; further is.language, expression, function.

Examples

is.call(call) #-> FALSE: Functions are NOT calls

# set up a function call to round with argument 10.5
cl <- call("round",10.5)
is.call(cl)# TRUE
cl
# such a call can also be evaluated.
eval(cl)# [1] 10