CODEWITHSUNDEEP
r
Tomas
Tomas

Reputation: 59585

Can variable be declared as global in function?

In R, when I want to modify global variable in function, I do it like this:

myfun <- function ()
{
    a <<- 1
    # .. later.. more complex code
    a <<- 2
    a <<- 3
}

I don't like having to specify <<- instead <- all the time. I am not used to it and I always forget. Is it in R somehow possible to declare variable as global just once? E.g. something along the lines:

myfun <- function ()
{
    global a

    a <- 1 # modify global var
    # .. later.. more complex code
    a <- 2 # modify global var
    a <- 3 # modify global var
}

PS: I do not see how this would be a duplicate of the proposed question. Please expand in an answer to explain.

Upvotes: 1

Views: 69

Answers (1)

Ronak Shah
Ronak Shah

Reputation: 389325

Why do you need <<- to update a all the time in global environment in the function ? Use it only once at the end of the function to update the global variable. 

myfun <- function () {
  a <- 1
  # .. later.. more complex code
  a <- 2
  a <<- 3
}

Upvotes: 1

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