pkg/R/F_Persistence.R

   1 #' Persistence Forecaster
   2 #'
   3 #' Return the last centered (similar) day curve.
   4 #' Inherits \code{\link{Forecaster}}
   5 #'
   6 PersistenceForecaster = R6::R6Class("PersistenceForecaster",
   7     inherit = Forecaster,
   8
   9     public = list(
  10         predictShape = function(data, today, memory, horizon, ...)
  11         {
  12             # Return centered last (similar) day curve, avoiding NAs until memory is run
  13             first_day = max(1, today-memory)
  14             same_day = ifelse(hasArg("same_day"), list(...)$same_day, TRUE)
  15             # If 'same_day', get the last known future of similar day: -7 + 1 == -6
  16             index = today - ifelse(same_day,6,0)
  17             repeat
  18             {
  19                 {
  20                     last_serie = data$getCenteredSerie(index)[1:horizon]
  21                     index = index - ifelse(same_day,7,1)
  22                 };
  23                 if (!any(is.na(last_serie)))
  24                     return (last_serie);
  25                 if (index < first_day)
  26                     return (NA)
  27             }
  28         }
  29     )
  30 )