We're trying to shift to a more systematic record of feature
requests, so can I suggest that you file a request at
That way, this won't get forgotten.
Ok, I've done it.
But while we're at it, it would be helpful if you could give the
algorithm for this filter, or a publicly-available citation that
gives the algorithm. So far as I can see on a quick search, it
seems to be a bit arcane, defined only in a 1981 book by Velleman
I can't find the proper reference either, I know it's on my books but can't
find it anywhere. Well I'll be happy if we could just have some sort of
Marcos Larios Santa Rosa