Message-ID: <x2d76kogg5.fsf@blueberry.kubism.ku.dk>
Date: 2001-07-28T22:07:54Z
From: Peter Dalgaard
Subject: style question: returning multiple arguments - structure orlist
In-Reply-To: Thomas Lumley's message of "Sat, 28 Jul 2001 14:43:25 -0700 (PDT)"
Thomas Lumley <tlumley at u.washington.edu> writes:
> I think you'll find that the first argument of an assignment function has
> to exist already -- the function is passed the evaluated first argument.
>
> This means it isn't quite true that
> a<-"foo<-"(a,value)
> is the same as
> foo(a)<-value
>
> eg
> > "foo<-"<-function(x,value){list(substitute(x),value)}
> > foo(a)<-4
> Error: Object "a" not found
> > "foo<-"(a,1)
> [[1]]
> a
>
> [[2]]
> [1] 1
> > a<-1
> > foo(a)<-4
> > a
> [[1]]
> *tmp*
>
> [[2]]
> [1] 4
>
>
> If this is correct, then you can't really write "list<-"
Dang! You're right...
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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