[R-SIG-Finance] can I 'attach' a zoo object?

[Achim Zeileis]

On Tue, 25 May 2010, Matthieu Stigler wrote:

> Hi
>
> When importing a big data frame, I like to "attach" its variables so 
> they are direclty available. I don't see how to do this with zoo... Does 
> anyone has an idea how I could do that?

It can't be done directly as attach() is non-generic and will tell you

R> attach(zoo1)
Error in attach(zoo1) :
   'attach' only works for lists, data frames and environments

You can do two things: (1) Use with() which I personally typically prefer 
over attach()/detach() anyway. (2) Create a data.frame where every column 
is a zoo series and attach that.

R> with(zoo1, vara + varb)
2003-02-02 2003-02-04 2003-02-08
  0.8189917  1.1104191  0.8113533

Or:

R> zoo2 <- merge(zoo1, retclass = "data.frame")
R> names(zoo2) <- colnames(zoo1)
R> attach(zoo2)
R> vara + varb
2003-02-02 2003-02-04 2003-02-08
  0.8189917  1.1104191  0.8113533

hth,
Z

> Take a zoo object:
>
> library(zoo)
>
> zooframe<-matrix(runif(3*26), nrow=3, dimnames=list(letters[1:3], 
> paste("var", letters, sep="")))
>
> zoo1 <-zoo(zooframe, order.by=as.Date("2003-02-01") + c(1, 
> 3, 7))
>
>
> Can I 'attach' it, so its variables become accessible to user workspace?
>
> attach(zoo1)
>
> #does not work...
>
> Thanks!
>
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