+++ /dev/null
-#' @title dateIndexToInteger
-#'
-#' @description Transform a (potential) date index into an integer (relative to data)
-#'
-#' @param index Date (or integer) index
-#' @param data Object of class \code{Data}
-#'
-#' @export
-dateIndexToInteger = function(index, data)
-{
- index = index[1]
- if (is.numeric(index))
- index = as.integer(index)
- if (is.integer(index))
- return (index)
- if (inherits(index, "Date") || is.character(index))
- {
- tryCatch(dt <- as.POSIXct(index), error=function(e) stop("Unrecognized index format"))
- #TODO: tz arg to difftime ?
- integerIndex <- round( (as.numeric( difftime(dt, data$getTime(1)) ))[1] ) + 1
- if (integerIndex > 0 && integerIndex <= data$getSize())
- {
- #WARNING: if series start at date >0h, result must be shifted
- date1 = as.POSIXlt(data$getTime(1)[1])
- date2 = as.POSIXlt(data$getTime(2)[1])
- shift = (date1$year==date2$year && date1$mon==date2$mon && date1$mday==date2$mday)
- return (integerIndex + ifelse(shift,1,0))
- }
- stop("Date outside data range")
- }
- stop("Unrecognized index format")
-}
-
-#' @title integerIndexToDate
-#'
-#' @description Transform an integer index to date index (relative to data)
-#'
-#' @param index Date (or integer) index
-#' @param data Object of class \code{Data}
-#'
-#' @export
-integerIndexToDate = function(index, data)
-{
- index = index[1]
- if (is.numeric(index))
- index = as.integer(index)
- if (!is.integer(index))
- stop("'index' should be an integer")
- as.Date( data$getTime(index)[1] )
-}
-
-#' @title getSimilarDaysIndices
-#'
-#' @description Find similar days indices in the past
-#'
-#' @param index Day index (numeric or date)
-#' @param limit Maximum number of indices to return
-#' @param same_seaon Should the indices correspond to day in same season?
-#'
-#' @export
-getSimilarDaysIndices = function(index, limit, same_season)
-{
- index = dateIndexToInteger(index)
-
- #TODO: mardi similaire à lundi mercredi jeudi aussi ...etc
- if (!same_season)
- {
- #take all similar days in recent past
- nb_days = min( (index-1) %/% 7, limit)
- return ( rep(index,nb_days) - 7*seq_len(nb_days) )
- }
-
- #Look for similar days in similar season (+/- 30 days)
- days = c()
- i = index
- while (i >= 1 && length(days) < limit)
- {
- if (i < index)
- {
- days = c(days, i)
- #look in the "future of the past"
- for (j in 1:4)
- days = c(days, i+7*j)
- }
- #...and in the "past of the past"
- for (j in 1:4)
- {
- if (i - 7*j >= 1)
- days = c(days, i-7*j)
- }
- # TODO: exact computation instead of -364
- # 364 = closest multiple of 7 to 365 - drift along the years... but not so many years so OK
- i = i - 364
- }
-
- return ( days[1:min(limit,length(days))] )
-}