cleaning - fix getSimilarDaysIndices ; to finish
[talweg.git] / pkg / R / J_Neighbors.R
1 #' Obtain jump forecast by the Neighbors method
2 #'
3 #' @inheritParams computeForecast
4 #' @inheritParams getZeroJumpPredict
5 #'
6 getNeighborsJumpPredict = function(data, today, memory, horizon, params, ...)
7 {
8 first_day = max(1, today-memory)
9 filter = params$indices >= first_day
10 indices = params$indices[filter]
11 weights = params$weights[filter]
12
13 if (any(is.na(weights) | is.na(indices)))
14 return (NA)
15
16 gaps = sapply(indices, function(i) {
17 data$getSerie(i+1)[1] - tail(data$getSerie(i), 1)
18 })
19 scal_product = weights * gaps
20 norm_fact = sum( weights[!is.na(scal_product)] )
21 sum(scal_product, na.rm=TRUE) / norm_fact
22 }