> Try do.call like this:
>
> ff <- x ~ g*h
> do.call("substitute", list(ff, list(x = as.name("weight"))))
>
It is even more complicated.
All I know is that ff is a formula with an expression on the left hand
side. This expression needs to be replaced by "weights".
According to the documentation, substitute only handles
replacement of variables by something else,
and that is not enough in my case.
--
Erich Neuwirth, Didactic Center for Computer Science
University of Vienna
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