pkg/R/F_Persistence.R

   1 #' @include Forecaster.R
   2 #'
   3 #' Persistence Forecaster
   4 #'
   5 #' Return the last centered (similar) day curve.
   6 #' Inherits \code{\link{Forecaster}}
   7 PersistenceForecaster = R6::R6Class("PersistenceForecaster",
   8     inherit = Forecaster,
   9
  10     public = list(
  11         predictShape = function(data, today, memory, horizon, ...)
  12         {
  13             # Return centered last (similar) day curve, avoiding NAs until memory is run
  14             first_day = max(1, today-memory)
  15             same_day = ifelse(hasArg("same_day"), list(...)$same_day, TRUE)
  16             # If 'same_day', get the last known future of similar day: -7 + 1 == -6
  17             index = today - ifelse(same_day,6,0)
  18             repeat
  19             {
  20                 {
  21                     last_serie = data$getCenteredSerie(index)[1:horizon]
  22                     index = index - ifelse(same_day,7,1)
  23                 };
  24                 if (!any(is.na(last_serie)))
  25                     return (last_serie);
  26                 if (index < first_day)
  27                     return (NA)
  28             }
  29         }
  30     )
  31 )