body {base}R Documentation

Access to and Manipulation of the Body of a Function

Description

Get or set the body of a function.

Usage

body(fun = sys.function(sys.parent()))
body(fun, envir = parent.frame()) <- value

Arguments

fun a function object, or see Details.
envir environment in which the function should be defined.
value an expression or a list of R expressions.

Details

For the first form, fun can be a character string naming the function to be manipulated, which is searched for from the parent environment. If it is not specified, the function calling body is used.

Value

body returns the body of the function specified.
The assignment form sets the body of a function to the list on the right hand side.

Note

For ancient historical reasons, envir = NULL uses the global environment rather than the base environment. Please use envir = globalenv() instead if this is what you want, as the special handling of NULL may change in a future release.

See Also

alist, args, function.

Examples

body(body)
f <- function(x) x^5
body(f) <- expression(5^x)
## or equivalently  body(f) <- list(quote(5^x))
f(3) # = 125
body(f)

[Package base version 2.1.0 Index]