Hello Gabor, I just tried dput() and it seems that running aggregate deletes the following information from zoo objects: origin = structure(c(1, 1, 1970))
So before merging I added: chron(index(z),origin=c(1,1,1970))->index(z) which solves my problem. Is that behaviour of aggregate.zoo intended or a bug? Yours sincerely, gunnar -- View this message in context: http://www.nabble.com/zoo%3A-merging-aggregated-zoo-objects-fails-tp25633345p25643930.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.