[R-SIG-Finance] I have a problem with zoo object

[Gabor Grothendieck]

On Sat, Feb 5, 2011 at 2:31 PM, B. Jonathan B. Jonathan
<bkheijonathan at gmail.com> wrote:
> Hi all, can somebody correct me where I was wrong in following set of codes?
> I have a list where each element is zoo object and I want to call a
> particular zoo object through some assigned name, as follows:
>
>> library(zoo)
>> List <- vector("list", length=2)
>> names(List) <- LETTERS[1:2]
>> List[[1]] <- zooreg(rnorm(10), start=as.Date("2000-01-01"), frequency=1)
>> List[[2]] <- zooreg(rnorm(20), start=as.Date("2000-01-01"), frequency=11)
>> #List
>> namess <- "A"
>> window(List$namess, start=as.Date("2000-01-01"),
> end=as.Date("2000-01-01"))
> Error in attr(x, "tsp") <- c(1, NROW(x), 1) :
>  attempt to set an attribute on NULL

List$namess is the same as List[["namess"]] and there is no "namess"
component of List. You probably wanted:

window(List[[namess]], start=as.Date("2000-01-01"), end=as.Date("2000-01-01"))

or just

List[[namess]][as.Date("2000-01-01")]

or

start(List[[namess]])

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