As we have seen from PR#6846, we don't document much what happens to NAs
in plot functions. The formula interfaces do seem to be a bit of a mess,
as they call model.frame and so some (but only some) of them pick up the
options() setting of na.action. This means that for example
pairs(~ x +y +
On Mon, 3 May 2004, Prof Brian Ripley wrote:
I believe no function should be using getOption(na.action) without a
means to override it, and thus the formula methods of
boxplot, mosaicplot and pairs
should get an na.action argument. Further, since in all cases the
non-formula methods do
