On Wed, 25 Feb 2009, Gustaf Rydevik wrote:
On Wed, Feb 25, 2009 at 3:30 PM, hadley wickham <h.wick...@gmail.com> wrote:
And for completeness here's a function that returns the next integer
on each call.
n <- (function(){
i <- 0
function() {
i <<- i + 1
i
}
})()
n()
[1] 1
n()
[1] 2
n()
[1] 3
n()
[1] 4
n()
[1] 5
n()
[1] 6
;)
Hadley
*headache*!
I can't wrap my head around this one - too strange code!
Could someone please give a hint on what's going on?
How does"i<<- i+1" modify i permanently, seeing as i is defined as 0
to start with?
i is not _defined_ as zero. It is initially _assigned_ the value of zero
and is subsequently assigned other values.
As for the details of what goes here, see
An Introduction to R
Section 10.7 Scope
and study the open.acount() example there.
HTH,
Chuck
/Gustaf
--
Gustaf Rydevik, M.Sci.
tel: +46(0)703 051 451
address:Essingetorget 40,112 66 Stockholm, SE
skype:gustaf_rydevik
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Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:cbe...@tajo.ucsd.edu UC San Diego
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