Dear all,
I have several text files looking like this:
9063032 19700201 22:00 174.067
9063032 19700201 23:00 174.076
9063032 19700202 00:00 174.085
9063032 19700202 01:00 174.091
9063032 19700202 02:00 174.094
9063032 19700202 03:00 174.091
9063032 19700202 04:00 174.082
9063032 19700202 05:00 174.079
And I run this loop:
for (j in 1:nr.of.files)
{
#Import:
DF <- read.table(path,header=FALSE,na.string='-9999',
colClasses=c("NULL","character","character","numeric"))
z <- zoo(DF$V4,chron(dates=DF$V2,times=paste(DF$V3,0,sep=":"),
format=c(dates="ymd",times="h:m:s")))
#getting daily values:
x <- aggregate(z,trunc,mean)
#summing everything up in one nr.of.files-dimensional zoo-object
if (j > 1) final <- merge(final,x) else final <- x
}
Unfortunately I get the following error message:
"Fehler in matrix(unlist(lapply(dots, origin)), nrow = 3) :
Versuch ein Attribut von NULL zu setzen"
(Error ... Trying to set an attribute NULL)
There is no error when I first run merge() and then aggregate(), but this is
not possible due to the rest of the program.
Does any one have a clue?
regards, gunnar
(R vers.2.9.1 (Debian Lenny, XFCE 4.4, EMACS 22.2.1, ESS 5.3.8))
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