R-beta: R 0.61.1 model.matrix(), etc.
rnassar at acpub.duke.edu
Sun Jul 5 15:29:48 CEST 1998
1. THANK YOU! to all who make R possible. It is a real joy to use.
2. The following may or may not be (minor) bugs, but I thought I'd mention
(a) model.matrix() seems unduly finicky: it seems to accept only "simple"
variable names (x1, but not, say, dframe$x1 or I(x1^2), for example) in
its argument. model.frame(), however, has no problem with these.
(b) If A is a factor, "mode(A)" returns "numeric", and both "is.numeric(A)"
and "is.factor(A)" return "TRUE".
Thank you again,
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