#' dateIndexToInteger
#'
-#' Transform a (potential) date index into an integer (relative to data)
+#' Transform a (potential) date index into an integer (relative to data beginning).
#'
#' @param index Date (or integer) index
-#' @param data Object of class \code{Data}
+#' @param data Object of class Data, output of \code{getData()}
#'
#' @export
dateIndexToInteger = function(index, data)
{
- #works on integers too: trust input
+ # Works on integers too: trust input
if (is.numeric(index))
index = as.integer(index)
if (is.integer(index))
if (inherits(index, "Date") || is.character(index))
{
- tryCatch(indexAsDate <- as.Date(index), error=function(e) stop("Unrecognized index format"))
+ tryCatch(indexAsDate <- as.Date(index),
+ error=function(e) stop("Unrecognized index format"))
#TODO: tz arg to difftime ?
integerIndex <- round( as.numeric(
difftime(indexAsDate, as.Date(data$getTime(1)[1])) ) ) + 1
#' integerIndexToDate
#'
-#' Transform an integer index to date index (relative to data)
+#' Transform an integer index (relative to data beginning) into a date index.
#'
-#' @param index Date (or integer) index
-#' @param data Object of class \code{Data}
+#' @inheritParams dateIndexToInteger
#'
#' @export
integerIndexToDate = function(index, data)
{
- #works on dates too: trust input
+ # Works on dates too: trust input
if (is.character(index))
index = as.Date(index)
if (is(index,"Date"))
#' getSimilarDaysIndices
#'
-#' Find similar days indices in the past.
+#' Find similar days indices in the past; at least same type of day in the week:
+#' monday=tuesday=wednesday=thursday != friday != saturday != sunday.
#'
#' @param index Day index (numeric or date)
+#' @param data Reference dataset, object output of \code{getData}
#' @param limit Maximum number of indices to return
#' @param same_season Should the indices correspond to day in same season?
+#' @param days_in Optional set to intersect with results (NULL to discard)
#'
#' @export
-getSimilarDaysIndices = function(index, limit, same_season)
+getSimilarDaysIndices = function(index, data, limit, same_season,
+ days_in=NULL, operational=TRUE)
{
- index = dateIndexToInteger(index)
-
- #TODO: mardi similaire à lundi mercredi jeudi aussi ...etc
- if (!same_season)
- {
- #take all similar days in recent past
- nb_days = min( (index-1) %/% 7, limit)
- return ( rep(index,nb_days) - 7*seq_len(nb_days) )
- }
+ index = dateIndexToInteger(index, data)
- #Look for similar days in similar season (+/- 30 days)
+ # Look for similar days (optionally in same season)
days = c()
- i = index
- while (i >= 1 && length(days) < limit)
+ dt_ref = as.POSIXlt(data$getTime(index)[1]) #first date-time of current day
+ day_ref = dt_ref$wday #1=monday, ..., 6=saturday, 0=sunday
+ month_ref = as.POSIXlt(data$getTime(index)[1])$mon+1 #month in 1...12
+ i = index - 1
+ if (!operational)
+ j = index + 1
+ while (length(days) < min( limit, ifelse(is.null(days_in),Inf,length(days_in)) ))
{
- if (i < index)
+ if (i >= 1)
{
- days = c(days, i)
- #look in the "future of the past"
- for (j in 1:4)
- days = c(days, i+7*j)
+ dt = as.POSIXlt(data$getTime(i)[1])
+ if ((is.null(days_in) || i %in% days_in) && .isSameDay(dt$wday, day_ref))
+ {
+ if (!same_season || .isSameSeason(dt$mon+1, month_ref))
+ days = c(days, i)
+ }
+ i = i - 1
}
- #...and in the "past of the past"
- for (j in 1:4)
+ if (!operational && j <= data$getSize())
{
- if (i - 7*j >= 1)
- days = c(days, i-7*j)
+ dt = as.POSIXlt(data$getTime(j)[1])
+ if ((is.null(days_in) || j %in% days_in) && .isSameDay(dt$wday, day_ref))
+ {
+ if (!same_season || .isSameSeason(dt$mon+1, month_ref))
+ days = c(days, j)
+ }
+ j = j + 1
}
- # 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 )
+}
- return ( days[1:min(limit,length(days))] )
+# isSameSeason
+#
+# Check if two months fall in the same "season" (defined by estimated pollution rate).
+#
+# @param month Month index to test
+# @param month_ref Month to compare to
+#
+.isSameSeason = function(month, month_ref)
+{
+ if (month_ref %in% c(11,12,1,2)) #~= mid-polluted
+ return (month %in% c(11,12,1,2))
+ if (month_ref %in% c(3,4,9,10)) #~= high-polluted
+ return (month %in% c(3,4,9,10))
+ return (month %in% c(5,6,7,8)) #~= non polluted
}
-#' getNoNA2
-#'
-#' Get indices in data of no-NA series followed by no-NA, within [first,last] range.
-#'
-#' @param data Object of class Data
-#' @param first First index (included)
-#' @param last Last index (included)
-#'
-#' @export
-getNoNA2 = function(data, first, last)
+# isSameDay
+#
+# Monday=Tuesday=Wednesday=Thursday ; Friday, Saturday, Sunday: specials.
+#
+# @param day Day index to test
+# @param day_ref Day index to compare to
+#
+.isSameDay = function(day, day_ref)
+{
+ if (day_ref %in% 1:4)
+ return (day %in% 1:4)
+ return (day == day_ref)
+}
+
+# getNoNA2
+#
+# Get indices in data of no-NA series preceded by no-NA, within [first,last] range.
+#
+# @inheritParams dateIndexToInteger
+# @param first First index (included)
+# @param last Last index (included)
+#
+.getNoNA2 = function(data, first, last)
{
(first:last)[ sapply(first:last, function(i)
- !any( is.na(data$getCenteredSerie(i)) | is.na(data$getCenteredSerie(i+1)) )
+ !any( is.na(data$getSerie(i-1)) | is.na(data$getSerie(i)) )
) ]
}
projects / talweg.git / blobdiff