SeriesAggreg <- function(TabSeries,TimeFormat,NewTimeFormat,ConvertFun,YearFirstMonth=01, verbose = TRUE){
##_Arguments_check
##check_TabSeries
if(is.null(TabSeries) ){ stop("TabSeries must be a dataframe containing the dates and data to be converted \n"); return(NULL); }
if(!is.data.frame(TabSeries)){ stop("TabSeries must be a dataframe containing the dates and data to be converted \n"); return(NULL); }
if(ncol(TabSeries)<2){ stop("TabSeries must contain at least two columns (including the coulmn of dates \n"); return(NULL); }
if("POSIXlt" %in% class(TabSeries[,1]) == FALSE & "POSIXct" %in% class(TabSeries[,1]) == FALSE){ stop("TabSeries first column must be a vector of class POSIXlt or POSIXct \n"); return(NULL); }
for(iCol in 2:ncol(TabSeries)){
if(!is.numeric(TabSeries[,iCol])){ stop("TabSeries columns (other than the first one) be of numeric class \n"); return(NULL); } }
##check_TimeFormat
if(is.null( TimeFormat)){ stop("TimeFormat must be 'hourly', 'daily', 'monthly' or 'yearly' \n"); return(NULL); }
if(!is.vector( TimeFormat)){ stop("TimeFormat must be 'hourly', 'daily', 'monthly' or 'yearly' \n"); return(NULL); }
if(!is.character(TimeFormat)){ stop("TimeFormat must be 'hourly', 'daily', 'monthly' or 'yearly' \n"); return(NULL); }
if(length(TimeFormat)!=1 ){ stop("TimeFormat must be 'hourly', 'daily', 'monthly' or 'yearly' \n"); return(NULL); }
if(TimeFormat %in% c("hourly","daily","monthly","yearly")==FALSE){
stop("TimeFormat must be 'hourly', 'daily', 'monthly' or 'yearly' \n"); return(NULL); }
##check_NewTimeFormat
if(is.null( NewTimeFormat)){ stop("NewTimeFormat must be 'hourly', 'daily', 'monthly' or 'yearly' \n"); return(NULL); }
if(!is.vector( NewTimeFormat)){ stop("NewTimeFormat must be 'hourly', 'daily', 'monthly' or 'yearly' \n"); return(NULL); }
if(!is.character(NewTimeFormat)){ stop("NewTimeFormat must be 'hourly', 'daily', 'monthly' or 'yearly' \n"); return(NULL); }
if(length(NewTimeFormat)!=1 ){ stop("NewTimeFormat must be 'hourly', 'daily', 'monthly' or 'yearly' \n"); return(NULL); }
if(NewTimeFormat %in% c("hourly","daily","monthly","yearly")==FALSE){
stop("NewTimeFormat must be 'hourly', 'daily', 'monthly' or 'yearly' \n"); return(NULL); }
##check_ConvertFun
if(is.null( ConvertFun)){ stop("ConvertFun must be a vector of character \n"); return(NULL); }
if(!is.vector( ConvertFun)){ stop("ConvertFun must be a vector of character \n"); return(NULL); }
if(!is.character(ConvertFun)){ stop("ConvertFun must be a vector of character \n"); return(NULL); }
if(length(ConvertFun)!=(ncol(TabSeries)-1)){ stop(paste("ConvertFun must be of length ",ncol(TabSeries)-1," (length=ncol(TabSeries)-1) \n",sep="")); return(NULL); }
if(sum(ConvertFun %in% c("sum","mean")==FALSE)!=0){ stop("ConvertFun elements must be either 'sum' or 'mean' \n"); return(NULL); }
##check_YearFirstMonth
if(is.null( YearFirstMonth)){ stop("YearFirstMonth must be an integer between 1 and 12 \n"); return(NULL); }
if(!is.vector( YearFirstMonth)){ stop("YearFirstMonth must be an integer between 1 and 12 \n"); return(NULL); }
if(!is.numeric(YearFirstMonth)){ stop("YearFirstMonth must be an integer between 1 and 12 \n"); return(NULL); }
YearFirstMonth <- as.integer(YearFirstMonth);
if(length(YearFirstMonth)!=1){ stop(paste("YearFirstMonth must be only one integer between 1 and 12 \n",sep="")); return(NULL); }
if(YearFirstMonth %in% (1:12) == FALSE){ stop(paste("YearFirstMonth must be only one integer between 1 and 12 \n",sep="")); return(NULL); }
##check_DatesR_integrity
if(TimeFormat=="hourly" ){ by <- "hours" ; }
if(TimeFormat=="daily" ){ by <- "days" ; }
if(TimeFormat=="monthly"){ by <- "months"; }
if(TimeFormat=="yearly" ){ by <- "years" ; }
TmpDatesR <- seq(from=TabSeries[1,1],to=tail(TabSeries[,1],1),by=by)
if(!identical(TabSeries[,1],TmpDatesR)){ stop("Problem detected in TabSeries dates vector (in comparison with seq(from=TabSeries[1,1],to=tail(TabSeries[,1],1))) \n"); return(NULL); }
##check_conversion_direction
if((TimeFormat == "daily" & NewTimeFormat %in% c("hourly") ) |
(TimeFormat == "monthly" & NewTimeFormat %in% c("hourly","daily") ) |
(TimeFormat == "yearly" & NewTimeFormat %in% c("hourly","daily","monthly"))){
stop("only time aggregation can be performed \n"); return(NULL); }
##check_if_conversion_not_needed
if((TimeFormat == "hourly" & NewTimeFormat=="hourly" ) |
(TimeFormat == "daily" & NewTimeFormat=="daily" ) |
(TimeFormat == "monthly" & NewTimeFormat=="monthly") |
(TimeFormat == "yearly" & NewTimeFormat=="yearly" )){
if(verbose){ warning("\t The old and new format are identical \n\t -> no time-step conversion was performed \n"); return(TabSeries); } }
##_Time_step_conversion
##_Handle_conventional_difference_between_hourly_series_and_others
TmpDatesR <- TabSeries[,1];
if(TimeFormat=="hourly"){ TmpDatesR <- TmpDatesR - 60*60; }
Hmax <- "00"; if(TimeFormat=="hourly"){ Hmax <- "23" }
##_Identify_the_part_of_the_series_to_be_aggregated
NDaysInMonth <- list("31",c("28","29"),"31","30","31","30","31","31","30","31","30","31")
YearLastMonth <- YearFirstMonth+11; if(YearLastMonth>12){ YearLastMonth <- YearLastMonth-12; }
YearFirstMonthTxt <- formatC(YearFirstMonth,format="d",width=2,flag="0")
YearLastMonthTxt <- formatC(YearLastMonth,format="d",width=2,flag="0")
if(NewTimeFormat=="daily" ){ Ind1 <- which(format(TmpDatesR, "%H")=="00");
Ind2 <- which(format(TmpDatesR, "%H")==Hmax);
if(Ind2[1]<Ind1[1]){ Ind2 <- Ind2[2:length(Ind2)]; }
if(tail(Ind1,1)>tail(Ind2,1)){ Ind1 <- Ind1[1:(length(Ind1)-1)]; }
### Aggr <- NULL; iii <- 0; for(kkk in 1:length(Ind1)){
### iii <- iii+1; Aggr <- c(Aggr,rep(iii,length(Ind1[kkk]:Ind2[kkk]))); }
Aggr <- as.numeric(format(TmpDatesR[min(Ind1):max(Ind2)],"%Y%m%d")); ### more efficient
NewDatesR <- data.frame(seq(from=TmpDatesR[min(Ind1)],to=TmpDatesR[max(Ind2)],by="days"))
}
if(NewTimeFormat=="monthly"){ Ind1 <- which(format(TmpDatesR, "%d%H")=="0100");
Ind2 <- which(format(TmpDatesR,"%m%d%H") %in% paste(c("0131","0228","0229","0331","0430","0531","0630","0731","0831","0930","1031","1130","1231"),Hmax,sep=""));
Ind2[1:(length(Ind2)-1)][diff(Ind2)==1] <- NA; Ind2 <- Ind2[!is.na(Ind2)]; ### to keep only feb 29 if both feb 28 and feb 29 exists
if(Ind2[1]<Ind1[1]){ Ind2 <- Ind2[2:length(Ind2)]; }
if(tail(Ind1,1)>tail(Ind2,1)){ Ind1 <- Ind1[1:(length(Ind1)-1)]; }
### Aggr <- NULL; iii <- 0; for(kkk in 1:length(Ind1)){
### iii <- iii+1; Aggr <- c(Aggr,rep(iii,length(Ind1[kkk]:Ind2[kkk]))); }
Aggr <- as.numeric(format(TmpDatesR[min(Ind1):max(Ind2)],"%Y%m")); ### more efficient
NewDatesR <- data.frame(seq(from=TmpDatesR[min(Ind1)],to=TmpDatesR[max(Ind2)],by="months"))
}
if(NewTimeFormat=="yearly" ){ Ind1 <- which(format(TmpDatesR,"%m%d%H") %in% paste(YearFirstMonthTxt,"0100",sep=""));
Ind2 <- which(format(TmpDatesR,"%m%d%H") %in% paste(YearLastMonthTxt,NDaysInMonth[[YearLastMonth]],Hmax,sep=""));
Ind2[1:(length(Ind2)-1)][diff(Ind2)==1] <- NA; Ind2 <- Ind2[!is.na(Ind2)]; ### to keep only feb 29 if both feb 28 and feb 29 exists
if(Ind2[1]<Ind1[1]){ Ind2 <- Ind2[2:length(Ind2)]; }
if(tail(Ind1,1)>tail(Ind2,1)){ Ind1 <- Ind1[1:(length(Ind1)-1)]; }
Aggr <- NULL; iii <- 0; for(kkk in 1:length(Ind1)){
iii <- iii+1; Aggr <- c(Aggr,rep(iii,length(Ind1[kkk]:Ind2[kkk]))); }
### Aggr <- as.numeric(format(TmpDatesR[min(Ind1):max(Ind2)],"%Y")); ### not working if YearFirstMonth != 01
NewDatesR <- data.frame(seq(from=TmpDatesR[min(Ind1)],to=TmpDatesR[max(Ind2)],by="years"))
}
##_Aggreation_and_export
NewTabSeries <- data.frame(NewDatesR)
for(iCol in 2:ncol(TabSeries)){
AggregData <- aggregate(TabSeries[min(Ind1):max(Ind2),iCol],by=list(Aggr),FUN=ConvertFun[iCol-1],na.rm=F)[,2]
NewTabSeries <- data.frame(NewTabSeries,AggregData)
}
names(NewTabSeries) <- names(TabSeries)
return(NewTabSeries);
}