[R] zoo: merging aggregated zoo-objects fails

[gunnar.p]

Hello Gabor,
thanks for your reply. Please excuse the insufficient description of my
problem. I hope this one is better:

#Importing my data works basically like this
dts <-
dates(c("19700201","19700201","19700201","19700202","19700202"),format="ymd")
tms <- times(paste(c("21:00", "22:00", "23:00","00:00",
"01:00"),0,sep=":"),format="h:m:s")
x   <- chron(dates=dts,times=tms)
z   <- zoo(c(174.055,174.067,174.076,174.085,174.091),x)
#Because I need daily values I run:
z   <- aggregate(z,trunc,mean)
#And because I deal with different data sets and need to sum them up I run:
m   <- merge(z,z)

When R executes merge() I get the following error message:
"Fehler in matrix(unlist(lapply(dots, origin)), nrow = 3) : Versuch ein
Attribut von NULL zu setzen"
(Sorry that it's German. It says something like 'Error... Try to set
attribute NULL')
It's curious that there is no error when I first run merge() and than
aggregate(), but this is not possible
due to the rest of the programm.
So why is merging not possible?

Thanks in advance,
gunnar
R version 2.9.1 (Debian Lenny, XFCE 4.4, EMACS 22.2.1, ESS 5.3.8)
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