[Rd] Assignment in environment

peter dalgaard
Sun, 07 Feb 2016 14:15:38 -0000

> On 07 Feb 2016, at 14:46 , Duncan Murdoch <murdoch.duncan at
gmail.com> wrot8[e:
>
[snippage]
>
> but in fact, this doesn't work:
>
> getValue(fn)[[1]] <- 3
> Error in getValue(fn)[[1]] <- 3 : could not find function
"getValue"
>
> I suspect this is a parser problem.

Umm, no...

The canonical semantics are that

foo(x)[[....]] <- bar

is internally converted to

*tmp* <- foo(x)
*tmp*[[....]] <- bar
x <- `foo<-`(x, *tmp*)

so both foo() and `foo<-` are required.

--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com