[R] primitives again
Waclaw.Marcin.Kusnierczyk at idi.ntnu.no
Mon Mar 16 09:06:46 CET 2009
Berwin A Turlach wrote:
> On Sun, 15 Mar 2009 14:23:40 +0100
> Wacek Kusnierczyk <Waclaw.Marcin.Kusnierczyk at idi.ntnu.no> wrote:
>> Edna Bell wrote:
>>> How do I find the functions which are primitives, please?
>> you can scan the whole search path for functions that are primitives:
>> primitives = sapply(search(), function(path)
>> with(as.environment(path), Filter(is.primitive, lapply(ls(),
>> primitives is a list of named lists of primitives, one sublist for
>> each attached package (most sublists will be empty, i guess).
> The code above will miss some primitives in package:base, namely those
> that start with a dot:
oops, right: it should have said
primitives = sapply(search(), function(path)
i was aware of this, but forgot to type it in in the mail, while it was
there in the console, hence i haven't noticed the lack of dot-primitives.
thanks for pointing this out.
> Also, but that is a matter of taste, it could be preferable to use
> sapply instead of lapply:
More information about the R-help