## 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; `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

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