projects / talweg.git / blame
| Commit | Line | Data |
|---|---|---|
| 25b75559 | 1 | #' dateIndexToInteger |
| 3d69ff21 | 2 | #' |
| 25b75559 | 3 | #' Transform a (potential) date index into an integer (relative to data) |
| 3d69ff21 BA |
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) | |
| 3d69ff21 | 13 | if (is.integer(index)) |
| a66a84b5 | 14 | return (index) #works on integers too: trust input |
| 09cf9c19 | 15 | if (inherits(index, "Date") || is.character(index)) |
| 3d69ff21 | 16 | { |
| 44a9990b | 17 | tryCatch(indexAsDate <- as.Date(index), error=function(e) stop("Unrecognized index format")) |
| 3d69ff21 | 18 | #TODO: tz arg to difftime ? |
| 44a9990b BA |
19 | integerIndex <- round( as.numeric( |
| 20 | difftime(indexAsDate, as.Date(data$getTime(1)[1])) ) ) + 1 | |
| 21 | if (integerIndex >= 1 && integerIndex <= data$getSize()) | |
| 25b75559 | 22 | return (integerIndex) |
| 3d69ff21 BA |
23 | stop("Date outside data range") |
| 24 | } | |
| 25 | stop("Unrecognized index format") | |
| 26 | } | |
| 27 | ||
| 25b75559 | 28 | #' integerIndexToDate |
| 09cf9c19 | 29 | #' |
| 25b75559 | 30 | #' Transform an integer index to date index (relative to data) |
| 09cf9c19 BA |
31 | #' |
| 32 | #' @param index Date (or integer) index | |
| 33 | #' @param data Object of class \code{Data} | |
| 34 | #' | |
| 35 | #' @export | |
| 36 | integerIndexToDate = function(index, data) | |
| 37 | { | |
| a66a84b5 BA |
38 | if (is(index,"Date")) |
| 39 | return (index) #works on dates too: trust input | |
| 09cf9c19 BA |
40 | index = index[1] |
| 41 | if (is.numeric(index)) | |
| 42 | index = as.integer(index) | |
| 43 | if (!is.integer(index)) | |
| a66a84b5 | 44 | stop("'index' should be a date or integer") |
| 09cf9c19 BA |
45 | as.Date( data$getTime(index)[1] ) |
| 46 | } | |
| 47 | ||
| 25b75559 | 48 | #' getSimilarDaysIndices |
| 3d69ff21 | 49 | #' |
| 25b75559 | 50 | #' Find similar days indices in the past |
| 3d69ff21 BA |
51 | #' |
| 52 | #' @param index Day index (numeric or date) | |
| 53 | #' @param limit Maximum number of indices to return | |
| 54 | #' @param same_seaon Should the indices correspond to day in same season? | |
| 55 | #' | |
| 56 | #' @export | |
| 57 | getSimilarDaysIndices = function(index, limit, same_season) | |
| 58 | { | |
| 59 | index = dateIndexToInteger(index) | |
| 60 | ||
| 61 | #TODO: mardi similaire à lundi mercredi jeudi aussi ...etc | |
| 62 | if (!same_season) | |
| 63 | { | |
| 64 | #take all similar days in recent past | |
| 65 | nb_days = min( (index-1) %/% 7, limit) | |
| 66 | return ( rep(index,nb_days) - 7*seq_len(nb_days) ) | |
| 67 | } | |
| 68 | ||
| 69 | #Look for similar days in similar season (+/- 30 days) | |
| 70 | days = c() | |
| 71 | i = index | |
| 72 | while (i >= 1 && length(days) < limit) | |
| 73 | { | |
| 74 | if (i < index) | |
| 75 | { | |
| 76 | days = c(days, i) | |
| 77 | #look in the "future of the past" | |
| 78 | for (j in 1:4) | |
| 79 | days = c(days, i+7*j) | |
| 80 | } | |
| 81 | #...and in the "past of the past" | |
| 82 | for (j in 1:4) | |
| 83 | { | |
| 84 | if (i - 7*j >= 1) | |
| 85 | days = c(days, i-7*j) | |
| 86 | } | |
| 87 | # TODO: exact computation instead of -364 | |
| 88 | # 364 = closest multiple of 7 to 365 - drift along the years... but not so many years so OK | |
| 89 | i = i - 364 | |
| 90 | } | |
| 91 | ||
| 92 | return ( days[1:min(limit,length(days))] ) | |
| 93 | } | |
| 25b75559 BA |
94 | |
| 95 | #' getSerie | |
| 96 | #' | |
| 97 | #' Return a time-serie from its centered version + level | |
| 98 | #' | |
| 99 | #' @param data A list as returned by \code{getData} | |
| 100 | #' @param index The index to return | |
| 101 | #' | |
| 102 | #' @export | |
| 103 | getSerie = function(data, index) | |
| 104 | data[[index]]$centered_serie + data[[index]]$level |