projects / talweg.git / blame
| Commit | Line | Data |
|---|---|---|
| 3d69ff21 BA |
1 | #' @title dateIndexToInteger |
| 2 | #' | |
| 3 | #' @description Transform a (potential) date index into an integer (relative to data) | |
| 4 | #' | |
| 5 | #' @param index Date (or integer) index | |
| 6 | #' @param data Object of class \code{Data} | |
| 7 | #' | |
| 8 | #' @export | |
| 9 | dateIndexToInteger = function(index, data) | |
| 10 | { | |
| 11 | if (is.numeric(index)) | |
| 12 | index = as.integer(index) | |
| 13 | #Undocumented "private" method to translate index --> date (is needed) | |
| 14 | if (is.integer(index)) | |
| 15 | return (index[1]) | |
| 16 | if (is.character(index)) | |
| 17 | { | |
| 18 | tryCatch(dt <- as.POSIXct(index[1]), finally=print("Unrecognized index format")) | |
| 19 | #TODO: tz arg to difftime ? | |
| 20 | integerIndex <- as.integer( difftime(dt, data$getTime(1)) ) + 1 | |
| 21 | if (integerIndex > 0 && integerIndex <= data$getSize()) | |
| 22 | return (integerIndex) | |
| 23 | stop("Date outside data range") | |
| 24 | } | |
| 25 | stop("Unrecognized index format") | |
| 26 | } | |
| 27 | ||
| 28 | #' @title getSimilarDaysIndices | |
| 29 | #' | |
| 30 | #' @description Find similar days indices in the past | |
| 31 | #' | |
| 32 | #' @param index Day index (numeric or date) | |
| 33 | #' @param limit Maximum number of indices to return | |
| 34 | #' @param same_seaon Should the indices correspond to day in same season? | |
| 35 | #' | |
| 36 | #' @export | |
| 37 | getSimilarDaysIndices = function(index, limit, same_season) | |
| 38 | { | |
| 39 | index = dateIndexToInteger(index) | |
| 40 | ||
| 41 | #TODO: mardi similaire à lundi mercredi jeudi aussi ...etc | |
| 42 | if (!same_season) | |
| 43 | { | |
| 44 | #take all similar days in recent past | |
| 45 | nb_days = min( (index-1) %/% 7, limit) | |
| 46 | return ( rep(index,nb_days) - 7*seq_len(nb_days) ) | |
| 47 | } | |
| 48 | ||
| 49 | #Look for similar days in similar season (+/- 30 days) | |
| 50 | days = c() | |
| 51 | i = index | |
| 52 | while (i >= 1 && length(days) < limit) | |
| 53 | { | |
| 54 | if (i < index) | |
| 55 | { | |
| 56 | days = c(days, i) | |
| 57 | #look in the "future of the past" | |
| 58 | for (j in 1:4) | |
| 59 | days = c(days, i+7*j) | |
| 60 | } | |
| 61 | #...and in the "past of the past" | |
| 62 | for (j in 1:4) | |
| 63 | { | |
| 64 | if (i - 7*j >= 1) | |
| 65 | days = c(days, i-7*j) | |
| 66 | } | |
| 67 | # TODO: exact computation instead of -364 | |
| 68 | # 364 = closest multiple of 7 to 365 - drift along the years... but not so many years so OK | |
| 69 | i = i - 364 | |
| 70 | } | |
| 71 | ||
| 72 | return ( days[1:min(limit,length(days))] ) | |
| 73 | } |