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[talweg.git] / 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 )