[R] Scope of variable?

[Jonathan P Daily]

?cat

cat prints text, and returns an invisible NULL. Also, it is general 
practice to assign values using '<-' even inside of functions, for reasons 
detailed in ?"<-"
--------------------------------------
Jonathan P. Daily
Technician - USGS Leetown Science Center
11649 Leetown Road
Kearneysville WV, 25430
(304) 724-4480
"Is the room still a room when its empty? Does the room,
 the thing itself have purpose? Or do we, what's the word... imbue it."
     - Jubal Early, Firefly

r-help-bounces at r-project.org wrote on 03/16/2011 07:41:36 AM:

> [image removed] 
> 
> [R] Scope of variable?
> 
> Ravi Kulkarni 
> 
> to:
> 
> r-help
> 
> 03/16/2011 09:07 AM
> 
> Sent by:
> 
> r-help-bounces at r-project.org
> 
> I know this is a very elementary question... I could not find a solution
> looking at old posts.
> I am unable to access a variable outside the scope of a for loop, even 
when
> the variable was defined before the loop:
> 
> haar <- function() {
> a = c(1.4560773, 2.3752412, 0.9798882, 3.0909252, 2.3986487, 1.8581543)
> 
> for (i in c(1:100)) {
>    m = matrix(rnorm(36)+1i*rnorm(36),6)
>    qrm = qr(m)
>    Q = qr.Q(qrm)
>    eival = eigen(Q, only.values=T)
>    ph = Arg(eival$values)
>    v = Mod(ph)
>    a = cat(a,v) 
> }
> hist(a)
> }
> 
> The hist command does not plot because a is null there.
> How do I plot a? I tried using 
> 
>                           assign("a", a, envir = .GlobalEnv)
> 
> but that does not help either... Neither did using <<-
> Any help is most welcome.
>   Ravi
> 
> --
> View this message in context: http://r.789695.n4.nabble.com/Scope-
> of-variable-tp3381485p3381485.html
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> 
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