> Make OPCON an environment and pass it into the functions that may read it or
> alter it. There
> is no real need to pass it out, since environments are changed in-place
> (unlike lists). E.g.,
> > x <- list2env(list(one=1, two="ii", three=3))
> > x
> <environment: 0x0000000003110890>
> > objects(x)
> [1] "one" "three" "two"
> > x[["two"]]
> [1] "ii"
> > with(x, three+one)
> [1] 4
> > f <- function(z, env) { env[["newZ"]] <- z ; sqrt(z) }
> > f(10, x)
> [1] 3.162278
> > x[["newZ"]] # put there by f()
> [1] 10
The advantage of using a reference class is you get an object with
defined behaviour, and something that you can document more easily.
Hadley
--
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/
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