There is more "fun" afoot here, but I don't recall what the point may be:
> args(get("+"))
function (e1, e2)
NULL
> args(get("["))
NULL
> get("[")
.Primitive("[")
> get("+")
function (e1, e2) .Primitive("+")
The other index operators, "[[", "[<-", "[[<-" are similar
The docs are pretty clear that args() on a primitive should yield a closure, so
at least the documentation seems to be wrong.
-pd
> On 6 Oct 2018, at 19:26 , Laurent Gautier <lgaut...@gmail.com> wrote:
>
> Hi,
>
> A short code example showing the warning might the only thing needed here:
>
> ```
>> formals(args(`[`))
> NULL
>
> *Warning message:In formals(fun) : argument is not a function*
>> is.function(`[`)
> [1] TRUE
>> is.primitive(`[`)
> [1] TRUE
> ```
>
> Now with an other primitive:
>
> ```
>> formals(args(`sum`))
> $...
>
>
> $na.rm
> [1] FALSE
>
>> is.function(`sum`)
> [1] TRUE
>> is.primitive(`sum`)
> [1] TRUE
>> class(`[`)
> [1] "function"
> ```
>
> Is this a feature ?
>
>
> Laurent
>
> [[alternative HTML version deleted]]
>
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--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd....@cbs.dk Priv: pda...@gmail.com
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