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 | { | |
| 09cf9c19 | 11 | index = index[1] |
| 3d69ff21 BA |
12 | if (is.numeric(index)) |
| 13 | index = as.integer(index) | |
| 3d69ff21 | 14 | if (is.integer(index)) |
| 09cf9c19 BA |
15 | return (index) |
| 16 | if (inherits(index, "Date") || is.character(index)) | |
| 3d69ff21 | 17 | { |
| 44a9990b | 18 | tryCatch(indexAsDate <- as.Date(index), error=function(e) stop("Unrecognized index format")) |
| 3d69ff21 | 19 | #TODO: tz arg to difftime ? |
| 44a9990b BA |
20 | integerIndex <- round( as.numeric( |
| 21 | difftime(indexAsDate, as.Date(data$getTime(1)[1])) ) ) + 1 | |
| 22 | if (integerIndex >= 1 && integerIndex <= data$getSize()) | |
| 09cf9c19 | 23 | { |
| 44a9990b BA |
24 | #WARNING: if index>=2 && series start at date >0h, result must be shifted |
| 25 | #Convention: if first date asked, return first matching index (i.e.: 1) | |
| 26 | shift = 0 | |
| 27 | if (integerIndex >= 2) | |
| 28 | { | |
| 29 | date1 = as.POSIXlt(data$getTime(1)[1]) | |
| 30 | date2 = as.POSIXlt(data$getTime(2)[1]) | |
| 31 | shift = (date1$year==date2$year && date1$mon==date2$mon && date1$mday==date2$mday) | |
| 32 | } | |
| 33 | return (integerIndex + shift) | |
| 09cf9c19 | 34 | } |
| 3d69ff21 BA |
35 | stop("Date outside data range") |
| 36 | } | |
| 37 | stop("Unrecognized index format") | |
| 38 | } | |
| 39 | ||
| 09cf9c19 BA |
40 | #' @title integerIndexToDate |
| 41 | #' | |
| 42 | #' @description Transform an integer index to date index (relative to data) | |
| 43 | #' | |
| 44 | #' @param index Date (or integer) index | |
| 45 | #' @param data Object of class \code{Data} | |
| 46 | #' | |
| 47 | #' @export | |
| 48 | integerIndexToDate = function(index, data) | |
| 49 | { | |
| 50 | index = index[1] | |
| 51 | if (is.numeric(index)) | |
| 52 | index = as.integer(index) | |
| 53 | if (!is.integer(index)) | |
| 54 | stop("'index' should be an integer") | |
| 55 | as.Date( data$getTime(index)[1] ) | |
| 56 | } | |
| 57 | ||
| 3d69ff21 BA |
58 | #' @title getSimilarDaysIndices |
| 59 | #' | |
| 60 | #' @description Find similar days indices in the past | |
| 61 | #' | |
| 62 | #' @param index Day index (numeric or date) | |
| 63 | #' @param limit Maximum number of indices to return | |
| 64 | #' @param same_seaon Should the indices correspond to day in same season? | |
| 65 | #' | |
| 66 | #' @export | |
| 67 | getSimilarDaysIndices = function(index, limit, same_season) | |
| 68 | { | |
| 69 | index = dateIndexToInteger(index) | |
| 70 | ||
| 71 | #TODO: mardi similaire à lundi mercredi jeudi aussi ...etc | |
| 72 | if (!same_season) | |
| 73 | { | |
| 74 | #take all similar days in recent past | |
| 75 | nb_days = min( (index-1) %/% 7, limit) | |
| 76 | return ( rep(index,nb_days) - 7*seq_len(nb_days) ) | |
| 77 | } | |
| 78 | ||
| 79 | #Look for similar days in similar season (+/- 30 days) | |
| 80 | days = c() | |
| 81 | i = index | |
| 82 | while (i >= 1 && length(days) < limit) | |
| 83 | { | |
| 84 | if (i < index) | |
| 85 | { | |
| 86 | days = c(days, i) | |
| 87 | #look in the "future of the past" | |
| 88 | for (j in 1:4) | |
| 89 | days = c(days, i+7*j) | |
| 90 | } | |
| 91 | #...and in the "past of the past" | |
| 92 | for (j in 1:4) | |
| 93 | { | |
| 94 | if (i - 7*j >= 1) | |
| 95 | days = c(days, i-7*j) | |
| 96 | } | |
| 97 | # TODO: exact computation instead of -364 | |
| 98 | # 364 = closest multiple of 7 to 365 - drift along the years... but not so many years so OK | |
| 99 | i = i - 364 | |
| 100 | } | |
| 101 | ||
| 102 | return ( days[1:min(limit,length(days))] ) | |
| 103 | } |