Nothing
simocc <-
function(start, end, length){
sn <- as.numeric(start)
en <- as.numeric(seq(end,by=paste("-",length, sep=""), len=2)[2]-1)
deb <- as.POSIXct(runif(1, sn, en), origin="1970-01-01")
fin <- seq(deb, by=length, len=2)[2]
return(c(start=deb, end=fin))
}
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