na.locf(x, xout = newdate)
seems not much worse than subscripting but at any rate here we define a subclass of "zoo"
called "zoo2"
in which [
uses na.locf
. This is an untested minimal implementation but it could be extended:
as.zoo2 <- function(x) UseMethod("as.zoo2")
as.zoo2.zoo <- function(x) structure(x, class = c("zoo2", setdiff(class(x), "zoo2")))
"[.zoo2" <- function(x, i, ...) {
if (!missing(i) && inherits(i, class(index(x)))) {
zoo:::`[.zoo`(na.locf(x, xout = i),, ...)
} else as.zoo2(zoo:::`[.zoo`(x, i, ...))
}
This gives:
> series2 <- as.zoo2(series)
> series2[full.dates[11]]
2014-01-04
1