| Recall {base} | R Documentation |
Recall is used as a placeholder for the name of the function
in which it is called. It allows the definition of recursive
functions which still work after being renamed, see example below.
Recall(...)
... |
all the arguments to be passed. |
Recall will not work correctly when passed as a function
argument, e.g. to the apply family of functions.
local for another way to write anonymous recursive functions.
## A trivial (but inefficient!) example:
fib <- function(n) if(n<=2) {if(n>=0) 1 else 0} else Recall(n-1) + Recall(n-2)
fibonacci <- fib; rm(fib)
## renaming wouldn't work without Recall
fibonacci(10) # 55