[R] Rbind for appending zoo objects
Gabor Grothendieck
ggrothendieck at gmail.com
Tue Jan 30 11:10:05 CET 2007
That is how rbind in the core of R works too and rbind.zoo works the same.
Try:
rbind(y1, y2[, colnames(y1)])
On 1/30/07, Shubha Vishwanath Karanth <shubhak at ambaresearch.com> wrote:
> Hi R,
>
>
>
> y1 <- zoo(matrix(1:10, ncol = 2), 1:5)
>
> colnames(y1)=c("a","b")
>
> y2 <- zoo(matrix(rnorm(10), ncol = 2), 6:10)
>
> colnames(y2)=c("b","a")
>
>
>
> > y1
>
> a b
>
> 1 1 6
>
> 2 2 7
>
> 3 3 8
>
> 4 4 9
>
> 5 5 10
>
>
>
> > y2
>
> b a
>
> 6 0.9070204 0.3527630
>
> 7 1.2405943 0.8275001
>
> 8 -0.1690653 -0.1724976
>
> 9 -0.6905223 -1.1127670
>
> 10 0.3776210 0.4208908
>
>
>
> Now, I have to append these two zoo objects, y1 and y2. So, I do as
> follows:
>
>
>
> > rbind(y2,y1)
>
> b a
>
> 1 1.0000000 6.0000000
>
> 2 2.0000000 7.0000000
>
> 3 3.0000000 8.0000000
>
> 4 4.0000000 9.0000000
>
> 5 5.0000000 10.0000000
>
> 6 0.9070204 0.3527630
>
> 7 1.2405943 0.8275001
>
> 8 -0.1690653 -0.1724976
>
> 9 -0.6905223 -1.1127670
>
> 10 0.3776210 0.4208908
>
> >
>
>
>
> The doubts I get are as follows:
>
> 1. The above rbind function for the zoo objects doesn't take care
> of the column names while merging. Example: Column 'a' of y1 is appended
> with column 'b' of y2. Why is this so? How do I get rid of this?
> 2. In the rbind function, I have given y2 first and then y1. But in
> the appended data, I see the data corresponding to y1 first and then of
> y2. Is this because of ordering of the index elements of the zoo
> objects?
>
>
>
> Or, is there any other better function to append zoo objects?
>
>
>
> Thanks in advance,
>
> Shubha
>
>
> [[alternative HTML version deleted]]
>
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