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################################################################################
### Function for creating an "sts" object with a given observation date
###
### Copyright (C) 2014-2015 Maelle Salmon
################################################################################
sts_observation <- function(sts,dateObservation,cut=TRUE)
{
# The sts object we shall return
stsSub <- sts
# Index of the observation date
line1 <- which(epoch(sts)==dateObservation)
# Maximal delay
D <- dim(stsSub@control$reportingTriangle$n)[2]-1
# Number of dates
theEnd <- dim(stsSub@control$reportingTriangle$n)[1]
# Nothing observed after the observation date (I am a genius)
stsSub@control$reportingTriangle$n[(line1+1):theEnd,] <- NA
stsSub@observed[(line1+1):theEnd] <- 0
# Not everything observed before the observation date
for (i in 1:D){
stsSub@control$reportingTriangle$n[line1+1-i,(i+1):(D+1)] <- NA
stsSub@observed[line1+1-i] <- sum(stsSub@control$reportingTriangle$n[line1+1-i,],na.rm=T)
}
stsSub@control$reportingTriangle$n <- stsSub@control$reportingTriangle$n[1:line1,]
# Return the new sts object
if (cut){return(stsSub[1:line1])}
else{return(stsSub)}
}
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