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# File annualfunction.R
# Part of the hydroTSM R package, https://github.com/hzambran/hydroTSM ;
# https://CRAN.R-project.org/package=hydroTSM
# Copyright 2008-2017 Mauricio Zambrano-Bigiarini
# Distributed under GPL 2 or later
################################################################################
# annualfunction: Generic function for computing monthly totals/mean values #
# for a zoo object or data.frame #
################################################################################
# Author : Mauricio Zambrano-Bigiarini #
################################################################################
# May 15th, 2009; Sep 01st 2009 ; #
# 06-Apr-2013 #
################################################################################
# 'x ' : daily, monthly or annual 'zoo' or 'data.frame' object
# 'FUN' : Function that will be applied to ALL the values in 'x' belonging to each weather season of the year
# (e.g., Fun can be some of c('mean', 'max', 'min', 'sd'))
# 'na.rm' : Logical. Should missing values be removed?
# TRUE : the annual values are computed considering only those values different from NA
# FALSE: if there is AT LEAST one NA within a year, the annual values are NA
annualfunction <- function(x, FUN, na.rm=TRUE,...) UseMethod("annualfunction")
annualfunction.default <- function(x, FUN, na.rm=TRUE,...) {
# Checking that 'x' is a zoo object
if ( !is.zoo(x) ) stop("Invalid argument: 'class(x)' must be in c('zoo', 'xts')")
annualfunction.zoo(x=x, FUN=FUN, na.rm=na.rm, ...)
} # 'annualfunction.default' end
################################################################################
# Author : Mauricio Zambrano-Bigiarini #
################################################################################
# Started: 09-Aug-2011 #
# Updates: 09-Aug-2011 #
# 03-Abr-2013 #
# 29-Nov-2015 #
################################################################################
annualfunction.zoo <- function(x, FUN, na.rm=TRUE,...) {
# If the user did not provide a title for the plots, this is created automatically
if (missing(FUN)) stop("Missing argument: 'FUN' must be provided")
# Annual index for 'x'
dates <- time(x)
y <- as.numeric(format( dates, "%Y" ))
years <- factor( y, levels=unique(y) )
# 'FUN' is first applied to all the values of 'x' belonging to the same year
totals <- aggregate( x, by= years, FUN=FUN, na.rm= na.rm, ... )
# 'FUN' is applied to all the previously computed annual values to get the final result.
if ( (is.matrix(x)) | (is.data.frame(x)) ) {
#totals <- apply(totals, MARGIN=2, FUN=FUN, an.rm=na.rm) # up to version 0.3-6
totals <- apply(totals, MARGIN=2, FUN=FUN, na.rm=na.rm, ...) # since version 0.3-7
} else totals <- aggregate(totals, by = rep("value", length(totals)), FUN = FUN, na.rm = na.rm, ...)
# Replacing the NaNs by 'NA.
# NaN's are obtained when using the FUN=mean with complete NA values
nan.index <- which(is.nan(totals))
if ( length(nan.index) > 0 ) totals[ nan.index] <- NA
# Replacing all the Inf and -Inf by NA's
# min(NA:NA, na.rm=TRUE) == Inf ; max(NA:NA, na.rm=TRUE) == -Inf
inf.index <- which(is.infinite(totals))
if ( length(inf.index) > 0 ) totals[inf.index] <- NA
# Giving meaningful names to the output
if ( (is.matrix(x)) | (is.data.frame(x)) ) {
totals <- t(totals) # For having the years as column names
} # IF end
return(totals)
} # 'annualfunction.zoo' end
############################################################################
# annualfunction: Generic function for computing monthly totals/mean values#
# for a zoo object or data.frame #
############################################################################
# Started: 15-May-2009 #
# Updates: 01-Sep-2009 ; 09-Aug-2011 #
# 29-May-2013 ; 03-Jun-2013 #
############################################################################
# 'dates' : "numeric", "factor", "Date" indicating how to obtain the
# dates correponding to the 'sname' station
# If 'dates' is a number, it indicates the index of the column in
# 'x' that stores the dates
# If 'dates' is a factor, it have to be converted into 'Date' class,
# using the date format specified by 'date.fmt'
# If 'dates' is already of Date class, the following line verifies that
# the number of days in 'dates' be equal to the number of element in the
# time series corresponding to the 'st.name' station
# 'date.fmt': format in which the dates are stored in 'dates'.
# ONLY required when class(dates)=="factor" or "numeric"
# 'out.type': string that define the desired type of output. Possible values are
# -) "data.frame": a data.frame, with as many columns as stations
# are included in 'x', and an additional column indicating the Year
# -) "db" : a data.frame, with 3 colums will be produced.
# The first column will store the Year,
# The second column will store the ID of the station,
# The third column will contain the seasonal
# value corresponding to that year and that station.
# 'verbose' : logical; if TRUE, progress messages are printed
annualfunction.data.frame <- function(x, FUN, na.rm=TRUE,
dates=1, date.fmt="%Y-%m-%d",
verbose=TRUE,...) {
# Checking that the user provied a valid argument for 'FUN'
if (missing(FUN))
stop("Missing argument: 'FUN' must be provided")
# Checking that the user provied a valid argument for 'dates'
if (is.na(match(class(dates), c("numeric", "factor", "Date"))))
stop("Invalid argument: 'dates' must be of class 'numeric', 'factor', 'Date'")
# If 'dates' is a number, it indicates the index of the column of 'x' that stores the dates
# The column with dates is then substracted form 'x' for easening the further computations
if ( class(dates) == "numeric" ) {
tmp <- dates
dates <- as.Date(x[, dates], format= date.fmt)
x <- x[-tmp]
} # IF end
# If 'dates' is a factor, it have to be converted into 'Date' class,
# using the date format specified by 'date.fmt'
if ( class(dates) == "factor" ) dates <- as.Date(dates, format= date.fmt)
# If 'dates' is already of Date class, the following line verifies that
# the number of days in 'dates' be equal to the number of element in the
# time series corresponding to the 'st.name' station
if ( ( class(dates) == "Date") & (length(dates) != nrow(x) ) )
stop("Invalid argument: 'length(dates)' must be equal to 'nrow(x)'")
x <- zoo(x, dates)
##############################################################################
annualfunction.zoo(x=x, FUN=FUN, na.rm=na.rm, ...)
} #'annualfunction.data.frame' END
############################################################################
# annualfunction: Generic function for computing monthly totals/mean values#
# for a zoo object or data.frame #
############################################################################
# Started: 2009-May-15 #
# Updates: 2009-Sep-01st ; 2011-Aug-09 #
# 29-May-2013 #
############################################################################
annualfunction.matrix <- function(x, FUN, na.rm=TRUE,
dates=1, date.fmt="%Y-%m-%d",
verbose=TRUE,...) {
x <- as.data.frame(x)
#NextMethod("daily2annual")
annualfunction.data.frame(x=x, FUN=FUN, na.rm=na.rm,
dates=dates, date.fmt=date.fmt,
verbose=verbose,...)
} # 'annualfunction.matrix' END
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