[R] R and Scheme

Wacek Kusnierczyk Waclaw.Marcin.Kusnierczyk at idi.ntnu.no
Tue Dec 9 10:54:03 CET 2008

Stavros Macrakis wrote:
> There is no equivalent to set-car!/rplaca (not even pairlists and
> expressions).  For example, r<-pairlist(1,2); r[[1]]<-r does not create a
> circular list. And in general there doesn't seem to be substructure sharing
> at the semantic level (though there may be in the implementation).

again, you can achieve the effect with environments:

e = new.env(parent=emptyenv())
e$e = e


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