[R] cbind'ing multivariate ts objects

[Prof Brian Ripley]

On Sat, 14 Jun 2008, Андрей Парамонов wrote:

> I use R 2.7.0 on GNU/Linux. I have noticed a problem in cbind method
> for multivariate time series (ts) objects. Consider the following
> example:
>
>> t <- ts(data.frame(a = 10:20, b = 20:30, c = 30:40, d = 40:50))
>> t1 <- t[, c('a', 'b')]
>> t2 <- t[, c('c', 'd')]
>>
>> colnames(t1)
> [1] "a" "b"
>> colnames(t2)
> [1] "c" "d"
>> colnames(cbind(t1, t2))
> [1] "t1.a" "t1.b" "t2.c" "t2.d"
>>
>
> Although it seems to be the documented behavior, I think it would be
> more consistent if the latter returned c("a", "b", "c", "d")

Consistent with what?  This is how all such combinations of matrices in R 
work, and avoids duplicate names.

> instead. Is there a nice way to achieve this? Thanks!

Use colnames() to change the names -- it is just a matrix.

tt <- cbind(t1, t2)
colnames(tt) <- c("a", "b", "c", "d")


>
> Andrey Paramonov
>
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>

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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