On 12/11/2008, at 11:29 AM, Peter Dalgaard wrote:
Ben Bolker wrote:
Sometime soon when I have the time and energy I will start
campaigning for an additional "drop" argument to subset that
does what one expects (!!??) with subsetted factor variables ...
Not that one again! For at least one other value of one, the
expectation
is the opposite: Factor levels do not go away just because they happen
not to be present in data.
fct <- lapply(dd, is.factor)
dd[fct] <- lapply(dd[fct], "[", drop=TRUE)
and begone with it...
(Don't you mean ``be done with it''?)
What would break if subset.default() were changed to:
function (x, subset, drop=FALSE, ...)
{
if (!is.logical(subset))
stop("'subset' must be logical")
x[subset & !is.na(subset),drop=drop]
}
???
cheers,
Rolf
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