right assignment ("->") and functions

You need an extra level of braces to resolve the ambiguity:

function(x) {x^2} -> f3

function(x) {x^2} -> f3

.Last.value

function(x) {x^2} -> f3

You need to do it as follows:

{function(x) {x^2}} -> f3
f3

function(x) {x^2}


Of course the inner braces around the x^2 are not necessary, now.

Bill Venables. 

-----Original Message-----
From: Robin Hankin [mailto:r.hankin at auckland.ac.nz]
Sent: Monday, June 23, 2003 1:32 PM
To: r-help at stat.math.ethz.ch
Subject: [R] right assignment ("->") and functions


Hi everyone

check this out [R-1.7.0]:

R> f1 <- function(x){x^2}
R> f1 -> f2
R> f2(4)
[1] 16
R> 
R> function(x){x^2} -> f3
function(x){x^2} -> f3
R> f3(4)
Error: couldn't find function "f3"

Why does right assignment "->" work in the first but not the second
case?  Can anyone else reproduce this?

Robin Hankin, Lecturer,
School of Geography and Environmental Science
Tamaki Campus
Private Bag 92019 Auckland
New Zealand

r.hankin at auckland.ac.nz(nospam)
tel 0064-9-373-7599 x6820; FAX 0064-9-373-7042

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