Function that storages variables from a list automatically, in another function

Question

For example I'd like to storage my variables only in f() function with the function setObj(argument), whose argument is a list with a,b,c,d fields, for example.

   f<-function(x){
  setObj(argument=x)
  (a+b+c+d)/4
}

So I can call my variables with their names, without subsetting from the list.

Thank you

given x is a list, a data frame, or an integer you can use function `with()` to call the varibales directly. — Patrik_P, Sep 05 '17 at 13:37

score 1 · Answer 1 · answered Sep 05 '17 at 13:39

1

I believe you are looking for with:

f<-function(x){
  with(x,
   (a+b+c+d)/4
  )
}


f(list(a=1,b=2,c=3,d=4))
[1] 2.5

answered Sep 05 '17 at 13:39

James

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Thank you James it works. I also solved with attach(setObj()) – Gianluca Pietronigro Sep 05 '17 at 13:51
1

@GianlucaPietronigro If you use `attach`, make sure to use `detach()` otherwise your environment can get pretty messed up. Better to avoid `attach()` altogether. – MrFlick Sep 05 '17 at 13:58

Function that storages variables from a list automatically, in another function

1 Answers1