yet another ts problem

[Paul Gilbert]

>3) Take all observations where time between "start" and the observation
>   is a multiple of "deltat".

ok, and I agree that window.ts seems a better place to do this. I would prefer

window.ts <- function (x, start=NULL, end=NULL, frequency=NULL, deltat=NULL)
then use is.null() rather than missing()
or
window.ts <- function (x, start=start(x), end=end(x), frequency=frequency(x),
deltat=NULL)

as I always get nervous (after many long hours debugging) about how missing
arguments will get matched.

Paul

P.S. And thanks for removing the warning.

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