You might want to look at the source for the R 'its' package. It defines
an S4 class for an irregular time series whose representation
consists of
1. a matrix portion analogous to your vector portion to hold the series
of multivariate series, and
2. a "dates" slot analogous to your accurate slot
and defines numerous methods for this class.
On 8/29/06, Robin Hankin <[EMAIL PROTECTED]> wrote:
> In the Green Book, section 7.5 discusses new vector classes and uses
> quaternions
> as an example of a vector class that needs more than one number per
> element.
>
> I would like to define a new class that has a numeric vector and a
> logical
> vector of the same length that specifies whether the measurement was
> accurate.
>
> The following code does not behave as desired:
>
> > setClass("thing",representation("vector",accurate="logical"))
> [1] "thing"
> > dput(x <- new("thing",1:10,accurate=rep(T,10)))
> structure(c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10), accurate = c(TRUE,
> TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE), class =
> structure("thing", package = ".GlobalEnv"))
> > x[1:3]
> [1] 1 2 3
> > dput(x[1:3])
> c(1, 2, 3)
> >
>
> because, although the "accurate" slot is filled as desired in "x",
> when extracting the first
> three elements, it seems to be lost.
>
> What is the appropriate setClass() call to do what I want? Or indeed
> is making "thing"
> a vector class as sensible idea here?
>
>
>
>
>
> --
> Robin Hankin
> Uncertainty Analyst
> National Oceanography Centre, Southampton
> European Way, Southampton SO14 3ZH, UK
> tel 023-8059-7743
>
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>
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