Have a function like the "_n_" in R ? (Automatic count function )

And for completeness here's a function that returns the next integer
on each call.

n <- (function(){
  i <- 0
  function() {
    i <<- i + 1
    i
  }
})()
  

actually, you do not need the external function to have the functionality:

    n = local({
        i = 0
        function() (i <<- i + 1)[1] })

    n()
    # 1
    n()
    # 2

vQ