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rlistdeque

Generating a list with fixed length

I need to generate a fixed-length list so that when the length is exceeded, the earliest item entered the list is dropped. This can be achieved by using deque (list-like container with fast appends and pops on either end) in Python.

I was wondering whether there is an R equivalent of python's deque ?

I know about dequer and rstackdeque libraries but none of them provide a fixed length queue.

Thanks in advance.

Solution

  • Not sure this is the best way to do it but based on the comment by @J_F, I wrote the following function:

    List <- vector("list", Length)

deque <- function(List, x)
{
  Length = length(List)
  List <- c(List, x)
  if (length(List) > Length)
  {
    List[1] <- NULL
  }
  return(List)
}