pkg/R/J_Persistence.R

   1 #' getPersistenceJumpPredict
   2 #'
   3 #' Analog of the PersistenceForecaster: predict the jump after last observed value either
   4 #' by re-applying the last jump between similar day and its follower (if argument
   5 #' "same_day" is TRUE), or by re-using the very last observed jump (when "same_day" =
   6 #' FALSE).
   7 #'
   8 #' @inheritParams computeForecast
   9 #' @inheritParams getZeroJumpPredict
  10 #'
  11 #' @aliases J_Persistence
  12 #'
  13 getPersistenceJumpPredict = function(data, today, memory, horizon, params, ...)
  14 {
  15     #return gap between end of similar day curve and first day of tomorrow (in the past)
  16     first_day = max(1, today-memory)
  17     same_day = ifelse(hasArg("same_day"), list(...)$same_day, TRUE)
  18     index = today - ifelse(same_day,7,1)
  19     repeat
  20     {
  21         {
  22             last_serie_end = tail( data$getSerie(index), 1)
  23             last_tomorrow_begin = head( data$getSerie(index+1), 1)
  24             index = index - ifelse(same_day,7,1)
  25         };
  26         if (!is.na(last_serie_end) && !is.na(last_tomorrow_begin))
  27             return (last_tomorrow_begin - last_serie_end);
  28         if (index < first_day)
  29             return (NA)
  30     }
  31 }