'update'
[talweg.git] / R / F_Persistence.R
1 #' @include Forecaster.R
2 #'
3 #' @title Persistence Forecaster
4 #'
5 #' @description Return the last centered (similar) day curve.
6 #' Inherits \code{\link{Forecaster}}
7 PersistenceForecaster = setRefClass(
8 Class = "PersistenceForecaster",
9 contains = "Forecaster",
10
11 methods = list(
12 initialize = function(...)
13 {
14 callSuper(...)
15 },
16 predictShape = function(today, memory, horizon, ...)
17 {
18 # Return centered last (similar) day curve, avoiding NAs until memory is run
19 first_day = max(1, today-memory)
20 same_day = ifelse(hasArg("same_day"), list(...)$same_day, TRUE)
21 # If 'same_day', get the last known future of similar day: -7 + 1 == -6
22 index = today - ifelse(same_day,6,0)
23 repeat
24 {
25 {
26 last_serie = data$getCenteredSerie(index)[1:horizon]
27 index = index - ifelse(same_day,7,1)
28 };
29 if (!any(is.na(last_serie)))
30 return (last_serie);
31 if (index < first_day)
32 return (NA)
33 }
34 }
35 )
36 )