"[.ggobiDataset" <- function(x, ..., drop=FALSE) {
x <- as.data.frame(x)
NextMethod("[", x)
}
"[[.ggobiDataset" <- function(x, ..., drop=FALSE) {
x <- as.data.frame(x)
NextMethod("[[", x)
}
"$.ggobiDataset" <- function(x, ..., drop=FALSE) {
x <- as.data.frame(x)
NextMethod("$", x)
}
> class(x)
[1] "ggobiDataset" "data.frame"
> x[1:2,1:2]
total_bill tip
1 16.99 1.01
2 10.34 1.66
> x[[1]]
[1] 16.99 10.34 21.01 23.68 24.59 25.29 8.77 26.88 15.04 14.78 10.27 35.26
[13] 15.42 18.43 14.83 21.58 10.33 16.29 16.97 20.65 17.92 20.29 15.77 39.42
...
> x$total_bill
Error in "$.default"(x, "total_bill") : invalid subscript type
What do I need to do to get "$.ggobiDataset" to imitate a data.frame
like [ and [[ do?
Thanks,
Hadley
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