[R] Scope of variable?

[Ravi Kulkarni]

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

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