[R] Partial matching with $ extractor.

[Rolf Turner]

Has something changed, but I missed it?

My recollection is that $ extraction used partial matching.

E.g. if one did

    junk <- list(yuck=1,yurk=2,y=3)
    junk$y

then one would get 1 as the result; probably *not* the desired result.
See fortunes::fortune("toad").

To get the desired result, one would need to use junk[["y"]].

Likewise junk$yu would give 1; to get the value of "yurk", one would
need to use junk$yur or junk$yurk or (better?) junk[["yurk"]].

However, either my recollection is wrong, or something has changed.
When I do junk$y I get 3 (the "right" answer; the same as junk[["y"]]).
When I do junk$yu I get NULL (just as if I'd done junk[["yu"]]).

So: has something changed, or am I miss-remembering, or am I completely
confused about the whole issue?

Thanks for any enlightenment.

cheers,

Rolf Turner

-- 
Honorary Research Fellow
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276