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setMethod("sample", "data.frame", function (x, size, replace = FALSE, prob = NULL){
if (missing(size))
size <- nrow(x)
ii <- sample.int(nrow(x), size, replace, prob)
x[ii,,drop=FALSE]
})
setMethod("sample", "data.set", function (x, size, replace = FALSE, prob = NULL){
if (missing(size))
size <- nrow(x)
ii <- sample.int(nrow(x), size, replace, prob)
x[ii,,drop=FALSE]
})
setMethod("sample", "importer", function (x, size, replace = FALSE, prob = NULL){
if (missing(size))
size <- nrow(x)
ii <- sample.int(nrow(x), size, replace, prob)
x[ii,,drop=FALSE]
})
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