[ns] Tcl problem

[Jianxue Huang <jhuang@sce.carleton.ca>]

Hi, everybody:

When I define a Tcl procedure, I got some trouble to bring the 
variable which is defined outside the proc into the proc.
e.g.

:
:
set n(1) [$ns node]
set agent1 [Agent/...]
:

proc myproc {} {
	global ns n(1) agent1

	$ns attach-agent $n(1) $agent1
	:
	:
}

When I call this proc, I got an error:
	ns: myproc: can't read "n(1)": no such variable

If I remove the brackets on all n(1), and define the node name as n1, 
it is OK and the proc works well.  Since I need to randomly select 
some nodes in the proc,  I have to make the node name changable, such
like: n($i).  Can any one tell me what's wrong and how to do it?

Thanks.


Jianxue Huang