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

[Matthieu Stigler]

Thanks to all of you for your prompt answer!

attach(as.list(zoo1))

is the solution that best fit my needs!

Thanks!

Matthieu


Achim Zeileis a écrit :
> 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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