'update'

[talweg.git] / pkg / R / J_Neighbors.R

diff --git a/pkg/R/J_Neighbors.R b/pkg/R/J_Neighbors.R
index 03d3340..ceea803 100644 (file)
--- a/pkg/R/J_Neighbors.R
+++ b/pkg/R/J_Neighbors.R
@@ -1,18 +1,31 @@
-#' Obtain jump forecast by the Neighbors method
+#' getNeighborsJumpPredict
 #'
-#' @inheritParams getForecast
+#' Apply optimized weights on gaps observed on selected neighbors.
+#' This jump prediction method can only be used in conjunction with the Neighbors
+#' Forecaster, because it makes use of the optimized parameters to re-apply the weights
+#' on the jumps observed at days interfaces of the past neighbors.
+#'
+#' @inheritParams computeForecast
 #' @inheritParams getZeroJumpPredict
-getNeighborsJumpPredict = function(data, today, memory, horizon, params, ...)
+#'
+#' @aliases J_Neighbors
+#'
+getNeighborsJumpPredict = function(data, today, memory, predict_from, horizon,
+       params, ...)
 {
        first_day = max(1, today-memory)
-       filter = params$indices >= first_day
+       filter = (params$indices >= first_day)
        indices = params$indices[filter]
        weights = params$weights[filter]
-       if (any(is.na(weights) | is.na(indices)))
+
+       if (is.na(indices[1]))
                return (NA)
 
        gaps = sapply(indices, function(i) {
-               data$getSerie(i+1)[1] - tail(data$getSerie(i), 1)
+               if (predict_from >= 2)
+                       data$getSerie(i)[predict_from] - data$getSerie(i)[predict_from-1]
+               else
+                       head(data$getSerie(i),1) - tail(data$getSerie(i-1),1)
        })
        scal_product = weights * gaps
        norm_fact = sum( weights[!is.na(scal_product)] )