This looks like a problem in the chron package. Define:
c.chron <- function(...) chron(do.call("c", lapply(list(...), unclass)))
and then try it again. I will discuss it with the chron maintainer.
On Mon, Sep 28, 2009 at 6:41 AM, gunnar.p <pr...@uni-potsdam.de> wrote:
>
> 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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