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# File monthly2annual.R
# Part of the hydroTSM R package, https://github.com/hzambran/hydroTSM ;
# https://CRAN.R-project.org/package=hydroTSM
# Copyright 2009-2017 Mauricio Zambrano-Bigiarini
# Distributed under GPL 2 or later
################################################################################
# monthly2annual #
################################################################################
# Author : Mauricio Zambrano-Bigiarini #
################################################################################
# Started: 13-May-2009 #
################################################################################
# This function transform a MONTHLY regular time series into an ANNUAL one .
# It is only a wrapper to 'daily2annual' and it was not merged as unique function just for clarity
# 'x' : Monthly zoo object that will be converted into annual ones.
# class(x) must be 'zoo'
# 'FUN' : Function that have to be applied for transforming from daily to monthly time step
# For precipitation FUN MUST be "sum"
# For temperature and flow time series, FUN MUST be "mean"
# 'na.rm' : Logical. Should missing values be removed?
# TRUE : the monthly and annual values are computed considering only those values different from NA
# FALSE: if there is AT LEAST one NA within a year, the monthly and annual values are NA
# 'out.fmt': date format for the output time series. Possible values are:
# -) "%Y" : only the year will be used for the time. Default option. (e.g., "1961" "1962"...)
# -) "%Y-%m-%d": a complete date format will be used for the time. Default option. (e.g., "1961" "1962"...)
monthly2annual <-function(x,...) UseMethod("daily2annual")
#monthly2annual.default <- function(x, FUN, na.rm=TRUE, out.fmt="%Y",...) {
#daily2annual.default(x, FUN, na.rm=na.rm, out.fmt=out.fmt )
#} # 'monthly2annual.default' end
#monthly2annual.data.frame <- function(x, FUN, na.rm=TRUE, out.fmt="%Y",
#dates, date.fmt="%Y-%m-%d",
#out.type="data.frame",
#verbose=TRUE,...) {
#daily2annual.data.frame(x, FUN, na.rm=na.rm, out.fmt=out.fmt,
#dates=dates, date.fmt=date.fmt, out.type=out.type,
#verbose=verbose )
#} # 'monthly2annual.data.frame' END
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