why does EnvironmentSexp_ass_subscript (==
rpy2.rinterface.SexpEnvironment.__setitem__) copy the value it is
storing?:
PROTECT(sexp_copy = Rf_duplicate(sexp));
Rf_defineVar(sym, sexp_copy, rho_R);
I noticed this because I was trying to get dim<- to work on an
SexpVector -- r["dim<-"](mysexp, newdim) doesn't work (more about that
in a follow-up note), and the workaround would be something like
globalEnv["mysexp"] = mysexp
globalEnv["newdim"] = newdim
r("dim(mysexp) <- newdim")
But that is thwarted by the above call to Rf_duplicate. I guess I
could do the above and then
mysexp = globalEnv["mysexp"]
but that seems silly.
-- Nathaniel
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