On 13/11/2012 1:33 PM, Jamie Olson wrote:
I was surprised to notice that statements like:
h = function(...){list(...)}(x=4)
do not throw syntax errors. R claims that 'h' is now a function, but I
can't seem to call it.
> h = function(x){list(x)}(4)
> is(h)
[1] "function" "OptionalFunction" "PossibleMethod"
> h()
Error in list(x) : 'x' is missing
> h(4)
Error in h(4) : attempt to apply non-function
>
What's going on?
The body of your function is
{list(x)}(4)
The problem is,
{list(x)}
does not return a function, so you can't call it with the argument 4.
If you had
h <- function(x) { function(y) y }(4)
it would return 4 every time, because the anonymous function does that.
Duncan Murdoch
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