set functions

[Jonathan Rougier]

I wonder if we might also include an "equiv" function along with the other
set functions (ie "union", "intersect", etc), perhaps along the lines of

"equiv" <- function(x, y) all(c(match(x, y, 0)>0, match(y, x, 0)>0))

(which I think might be the quickest implementation).  I use this type of
function quite frequently: is there some reason why it is not in the base?

Cheers, Jonathan.

Jonathan Rougier                       Science Laboratories
Department of Mathematical Sciences    South Road
University of Durham                   Durham DH1 3LE

"[B]egin upon the precept ... that the things we see are to be 
 weighed in the scale with what we know"  (Meredith, 1879, The Egoist)


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