X-Git-Url: https://git.auder.net/?a=blobdiff_plain;f=pkg%2FR%2FgetData.R;h=a4e1e17b2e1808568dc5b0dd88cbaf5f86abbb26;hb=a66a84b56467194852f2faee15f4725759b24158;hp=5139a4da18dfda81105ce0e2b57e2ff1839a8090;hpb=469529710f56c790ae932b45d13fed2e34bcabf2;p=talweg.git

diff --git a/pkg/R/getData.R b/pkg/R/getData.R
index 5139a4d..a4e1e17 100644
--- a/pkg/R/getData.R
+++ b/pkg/R/getData.R
@@ -2,8 +2,7 @@
 #'
 #' @description Take in input data frames and/or files containing raw data, and timezones, and
 #'   output a Data object, roughly corresponding to a list where each cell contains all value
-#'   for one day (see \code{?Data}). Current limitation: series (in working_tz) must start at
-#'   right after midnight (to keep in sync with exogenous vars)
+#'   for one day (see \code{?Data}).
 #'
 #' @param ts_data Time-series, as a data frame (DB style: 2 columns, first is date/time,
 #'   second is value) or a CSV file
@@ -14,22 +13,30 @@
 #'   see \code{strptime})
 #' @param working_tz Timezone to work with ("GMT" or e.g. "Europe/Paris")
 #' @param predict_at When does the prediction take place ? Integer, in hours. Default: 0
+#' @param limit Number of days to extract (default: Inf, for "all")
 #'
 #' @return An object of class Data
 #'
+#' @examples
+#' ts_data = read.csv(system.file("extdata","pm10_mesures_H_loc.csv",package="talweg"))
+#' exo_data = read.csv(system.file("extdata","meteo_extra_noNAs.csv",package="talweg"))
+#' data = getData(ts_data, exo_data, limit=120)
 #' @export
-getData = function(ts_data, exo_data,
-	input_tz="GMT", date_format="%d/%m/%Y %H:%M", working_tz="GMT", predict_at=0)
+getData = function(ts_data, exo_data, input_tz="GMT", date_format="%d/%m/%Y %H:%M",
+	working_tz="GMT", predict_at=0, limit=Inf)
 {
 	# Sanity checks (not full, but sufficient at this stage)
 	if (!is.character(input_tz) || !is.character(working_tz))
 		stop("Bad timezone (see ?timezone)")
 	input_tz = input_tz[1]
 	working_tz = working_tz[1]
-	if (!is.data.frame(ts_data) && !is.character(ts_data))
-		stop("Bad time-series input (data frame or CSV file)")
+	if ( (!is.data.frame(ts_data) && !is.character(ts_data)) ||
+			(!is.data.frame(exo_data) && !is.character(exo_data)) )
+		stop("Bad time-series / exogenous input (data frame or CSV file)")
 	if (is.character(ts_data))
 		ts_data = ts_data[1]
+	if (is.character(exo_data))
+		exo_data = exo_data[1]
 	predict_at = as.integer(predict_at)[1]
 	if (predict_at<0 || predict_at>23)
 		stop("Bad predict_at (0-23)")
@@ -38,17 +45,15 @@ getData = function(ts_data, exo_data,
 	date_format = date_format[1]
 
 	ts_df =
-		if (is.character(ts_data)) {
+		if (is.character(ts_data))
 			read.csv(ts_data)
-		} else {
+		else
 			ts_data
-		}
 	exo_df =
-		if (is.character(exo_data)) {
+		if (is.character(exo_data))
 			read.csv(exo_data)
-		} else {
+		else
 			exo_data
-		}
 	# Convert to the desired timezone (usually "GMT" or "Europe/Paris")
 	formatted_dates_POSIXlt = strptime(as.character(ts_df[,1]), date_format, tz=input_tz)
 	ts_df[,1] = format(as.POSIXct(formatted_dates_POSIXlt), tz=working_tz, usetz=TRUE)
@@ -56,7 +61,7 @@ getData = function(ts_data, exo_data,
 	line = 1 #index in PM10 file (24 lines for 1 cell)
 	nb_lines = nrow(ts_df)
 	nb_exos = ( ncol(exo_df) - 1 ) / 2
-	data = list() #new("Data")
+	data = Data$new()
 	i = 1 #index of a cell in data
 	while (line <= nb_lines)
 	{
@@ -73,24 +78,21 @@ getData = function(ts_data, exo_data,
 				break
 		}
 
-		# NOTE: if predict_at does not cut days at midnight,
-		# for the exogenous to be synchronized they need to be shifted
-		if (predict_at > 0)
-		{
-			exo_hat = as.data.frame(exo_df[max(1,i-1),(1+nb_exos+1):(1+2*nb_exos)])
-			exo_Dm1 = if (i>=3) as.data.frame(exo_df[i-1,2:(1+nb_exos)]) else NA
-		} else
-		{
-			exo_hat = as.data.frame(exo_df[i,(1+nb_exos+1):(1+2*nb_exos)])
-			exo_Dm1 = if (i>=2) as.data.frame(exo_df[i-1,2:(1+nb_exos)]) else NA
-		}
-		i = i + 1
-		#center data
+		exo = as.data.frame( exo_df[i,2:(1+nb_exos)] )
+		exo_hat = as.data.frame( exo_df[i,(1+nb_exos+1):(1+2*nb_exos)] )
 		level = mean(serie, na.rm=TRUE)
 		centered_serie = serie - level
-#		data$append(time, centered_serie, level, exo_hat, exo_Jm1) #TODO: slow: why ?
-		data[[length(data)+1]] = list("time"=time, "serie"=centered_serie, "level"=level,
-			"exo_hat"=exo_hat, "exo_Dm1"=exo_Dm1)
+		data$append(time, centered_serie, level, exo, exo_hat)
+		if (i >= limit)
+			break
+		i = i + 1
+	}
+	if (length(data$getCenteredSerie(1)) < length(data$getCenteredSerie(2)))
+		data$removeFirst()
+	if (length(data$getCenteredSerie(data$getSize()))
+		< length(data$getCenteredSerie(data$getSize()-1)))
+	{
+		data$removeLast()
 	}
-	new("Data",data=data)
+	data
 }