Speed up the loop operation in R

Question

I have a big performance problem in R. I wrote a function that iterates over a data.frame object. It simply adds a new column to a data.frame and a

Answer 1

Take a look at the accumulate() function from {purrr} :

dayloop_accumulate <- function(temp) {
  temp %>%
    as_tibble() %>%
     mutate(cond = c(FALSE, (V6 == lag(V6) & V3 == lag(V3))[-1])) %>%
    mutate(V10 = V9 %>% 
             purrr::accumulate2(.y = cond[-1], .f = function(.i_1, .i, .y) {
               if(.y) {
                 .i_1 + .i
               } else {
                 .i
               }
             }) %>% unlist()) %>%
    select(-cond)
}