[R] How to make "<-" generic?
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Sat Jul 26 12:33:24 CEST 2003
Peter Dalgaard BSA <p.dalgaard at biostat.ku.dk> writes:
> Prof Brian Ripley <ripley at stats.ox.ac.uk> writes:
> > What are you trying to do with this? Assignment (<-) is not a function,
> > and the language grammar does not convert a <- b into "<-"(a, b) (as it
> > would with the binary operator functions). You could call it that way,
> > and then it will probably work.
> Eh? Are you sure about that???
> > quote("<-"(a,b))
> a <- b
Adding on to this, I think the point is that assignment bypasses the
usual *evaluation* rules, even though it is syntactically a binop.
I think it basically has to be so: For one thing, it is kind of
difficult to check for a signature match without evaluating the
arguments and the left hand side of an assignment will not in general
exist at that point.
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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