| 1 | #' Obtain delta forecast by the Neighbors method |
| 2 | #' |
| 3 | #' @inheritParams getForecast |
| 4 | #' @inheritParams getZeroDeltaForecast |
| 5 | getNeighborsDeltaForecast = function(data, today, memory, horizon, shape_params, ...) |
| 6 | { |
| 7 | first_day = max(1, today-memory) |
| 8 | filter = shape_params$indices >= first_day |
| 9 | indices = shape_params$indices[filter] |
| 10 | weights = shape_params$weights[filter] |
| 11 | if (any(is.na(weights) | is.na(indices))) |
| 12 | return (NA) |
| 13 | |
| 14 | gaps = sapply(indices, function(i) { |
| 15 | data$getSerie(i+1)[1] - tail(data$getSerie(i), 1) |
| 16 | }) |
| 17 | |
| 18 | scal_product = weights * gaps |
| 19 | norm_fact = sum( weights[!is.na(scal_product)] ) |
| 20 | sum(scal_product, na.rm=TRUE) / norm_fact |
| 21 | } |