[R] best practice(s) for retrieving a local variable from a closure

Barry Rowlingson b.rowlingson at lancaster.ac.uk
Sat Apr 9 21:27:35 CEST 2011

On Sat, Apr 9, 2011 at 6:29 PM, Benjamin Tyner <btyner at gmail.com> wrote:

>> The above feels a bit like snooping where I wasn't invited.
>> You could do something like
>>  mq <- function(a) {
>>     force(a)
>>     list(getA = function()a,
>>          setA = function(newA) a <<- newA,
>>          fun = function(x)x^a
>>     )
>>  }
>> to make it clear that you expect people to look at or change
>> fun's 'a'.

 Once you start doing a lot of that though you may as well go the
whole OO hog and use the proto or R.oo packages...


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