body {base} | R Documentation |
Get or set the body of a function.
body(fun = sys.function(sys.parent())) body(fun, envir = environment(fun)) <- value
fun |
a function object, or see ‘Details’. |
envir |
environment in which the function should be defined. |
value |
an object, usually a language object: see section ‘Value’. |
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.
To set the value to a list call the replacement function with
value
a length-one list containing the desired value.
body
returns the body of the function specified. This is
normally a language object, most often a call to {
, but it can
also be an object (e.g. pi
) to be the return value of the function.
The replacement form sets the body of a function to the
object on the right hand side, and (potentially) resets the
environment of the function. If value
is of class
"expression"
or a length-one list, the first
element is used as the body. For expressions (but not lists) any
additional elements are ignored, with a warning.
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)