[R] How to modify the dot-dot-dot argument using level names instead of position

[Sébastien Bihorel]

Thanks Duncan

On Wed, Aug 31, 2011 at 9:43 AM, Duncan Murdoch
<murdoch.duncan at gmail.com> wrote:
> On 31/08/2011 9:41 AM, Sébastien Bihorel wrote:
>>
>> Hi,
>>
>> I thought "..2<- 1" was a correct way to modify the content of the
>> 2nd level of dot-dot-dot because it did not return any error message.
>> However, this appears to have no effect whatsoever on the content of
>> dot-dot-dot. So, I guess I should modify my question to: is it
>> possible to modify the content of dot-dot-dot by any means?
>
> Not from R code.  You can achieve the same effect by converting it to a
> list, manipulating the list, and then using do.call() to pass it on.
>
> Duncan Murdoch
>
>> Thank
>>
>> On Wed, Aug 31, 2011 at 9:25 AM, Sébastien Bihorel<pomchip at free.fr>
>>  wrote:
>> >  Dear R-users,
>> >
>> >  In the R internals manual, it is said that one can extract the
>> >  elements of the dot-dot-dot argument using the special symbols ..1 or
>> >  ..2. It seems to work just fine but I was wondering if there is a way
>> >  one can extract or modify the content of the dot-dot-dot argument
>> >  using a level name instead of its position?
>> >
>> >  For instance, assuming that list(...) returns:
>> >  $a
>> >    [1] 1 2 3 4 5 6 7 8 9 10
>> >
>> >  $b
>> >  [1] "a" "b" "c" "d" "e" "f" "g" "h"
>> >
>> >  is there a way to modify level b without knowing that it is the second
>> > level?
>> >
>> >  Thank you
>> >
>> >  Sebastien
>> >
>>
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>
>