Hi,
I know S manuals used to warn against using the same names for a
variable and a function, but I have never seen that cause problems in
R, so I usually don't pay much attention to it. Which is why the
following behaviour came as a surprise:
> bar <- function() 1
> foo <- function(bar = bar()) {
+ bar
+ }
> foo(9)
[1] 9
> foo()
Error in foo() : recursive default argument reference
Exactly what rule am I violating here?
The following gives a slightly different error, but I assume it has a
similar origin:
bar <- function() 1
foo <- function(bar) {
if (missing(bar)) bar <- bar()
bar
}
foo()
This version works fine though (so the rule probably involves function
arguments somehow):
foo <- function(baz) {
if (missing(baz)) {
baz <- function() 2
baz <- baz()
}
baz
}
foo()
-Deepayan
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