formals(fun=sys.function(sys.parent())) formals(obj) <- list
fun
is a function then the formal argument list to that
function is returned.
If fun
is a character string then the function with that name
is found and used.
If fun
is not specified then the function calling formals
is used.
The assignment form sets the formals of a function to the list on the right hand side.
args
for a ``humanreadable'' version,
alist
, body
, function
.length(formals(lm)) # the number of formal arguments names(formals(boxplot)) # formal arguments names f <- function(x)a+b formals(f) <- alist(a=,b=3) # function(a,b=3)a+b f(2) # result = 5