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 #'
   8 PersistenceForecaster = R6::R6Class("PersistenceForecaster",
   9     inherit = Forecaster,
  10
  11     public = list(
  12         predictShape = function(data, today, memory, horizon, ...)
  13         {
  14             # Return centered last (similar) day curve, avoiding NAs until memory is run
  15             first_day = max(1, today-memory)
  16             same_day = ifelse(hasArg("same_day"), list(...)$same_day, TRUE)
  17             # If 'same_day', get the last known future of similar day: -7 + 1 == -6
  18             index = today - ifelse(same_day,6,0)
  19             repeat
  20             {
  21                 {
  22                     last_serie = data$getCenteredSerie(index)[1:horizon]
  23                     index = index - ifelse(same_day,7,1)
  24                 };
  25                 if (!any(is.na(last_serie)))
  26                     return (last_serie);
  27                 if (index < first_day)
  28                     return (NA)
  29             }
  30         }
  31     )
  32 )