The warning message does tell you exactly what was wrong. You are
trying to merge zoo objects that have two different index classes.
The first is "POSIXct" and the second is "Date" class. Next time
please provide your data in reproducible form
as shown here:
library(zoo)
z1<- zoo(1:6, as.Date(c("1950-01-05", "1950-01-06", "1950-01-09",
+ "1950-01-10", "1950-01-11", "1950-01-12")))
z2<- zoo(c(16.66, 16.85, 16.93, 16.98, 17.08, 17.03),
+ as.POSIXct(c("1950-01-03, GMT", "1950-01-04, GMT", "1950-01-05, GMT",
+ "1950-01-06, GMT", "1950-01-09 GMT", "1950-01-10 GMT")))
merge(z1, z2 = aggregate(z2, as.Date, identity))
z1 z2
1950-01-03 NA 16.66
1950-01-04 NA 16.85
1950-01-05 1 16.93
1950-01-06 2 16.98
1950-01-09 3 17.08
1950-01-10 4 17.03
1950-01-11 5 NA
1950-01-12 6 NA
# or
z2.Date<- z2
time(z2.Date)<- as.Date(time(z2.Date))
merge(z1, z2.Date)
z1 z2.Date
1950-01-03 NA 16.66
1950-01-04 NA 16.85
1950-01-05 1 16.93
1950-01-06 2 16.98
1950-01-09 3 17.08
1950-01-10 4 17.03
1950-01-11 5 NA
1950-01-12 6 NA
On Thu, May 20, 2010 at 10:48 AM, Research<risk2...@ath.forthnet.gr> wrote:
Hello,
I have a zoo time series object (say a) with the following time
stamp/format
[1] "1950-01-03 GMT" "1950-01-04 GMT" "1950-01-05 GMT" "1950-01-06 GMT"
[5] "1950-01-09 GMT" "1950-01-10 GMT"
and another (say b) with
[1] "1950-01-05" "1950-01-06" "1950-01-09" "1950-01-10" "1950-01-11"
[6] "1950-01-12"
I want to merge these series but when I try:
head(merge(a, b ))
a b
1950-01-03 02:00:00 16.66 NA
1950-01-04 02:00:00 16.85 NA
1950-01-05 02:00:00 16.93 NA
1950-01-06 02:00:00 16.98 NA
1950-01-09 02:00:00 17.08 NA
1950-01-10 02:00:00 17.03 NA
Warning message:
In merge.zoo(a, b) :
Index vectors are of different classes: POSIXt Date
Anybody can help? I tried as.POSIXct(a,tz="GMT") but it doesn't seem to
work....
Many thanks in advance!
Costas
_
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status
major 2
minor 10.1
year 2009
month 12
day 14
svn rev 50720
language R
version.string R version 2.10.1 (2009-12-14)
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