-
Good morning
As it looks like from your code,
you are declaring the array n($i) only inside
your proc. However, because it is a local variable
it gets erased after the proc's execution. Therefore,
in your main script, when you try to access it with
$ns monitor-queue $n(3) $n(6) the interpreter
complains with an error.
What I would do in order to quickly solve this situation, would
be to declare the n array outside the proc and then import it
inside the procedure with global. This way, all changes made to
the array inside the proc, will stay and after the end of the procedure,
without disrupting
the execution flow.
That is why the interpreter cannot find the array in your main script.
According
to the script: it was never created (!?).
Hope that I have helped.
Regards,
-Fk
On 6/9/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
-- Forwarded message --
From: khodor abboud [EMAIL PROTECTED]
To: ns-users@ISI.EDU
Date: Fri, 08 Jun 2007 17:05:10 +0200
Subject: [ns] Help: error when using node generated by create_topology in
NS format
Hello evry Body,
I am using the NS format generated by brite. when i try to use the node
generated by the procedure create_topology (for monotoring per example), i
have this error :
// can't read n(3): no such variable
while executing
$ns monitor-queue create_topology.$n(3) $n(6)
invoked from within
set qmon36 [$ns monitor-queue create_topology.$n(3) $n(6) ]
(file topology.tcl line 189)//
the code is :
// proc create_topology {} {
global ns
#nodes:
set num_node 10
for {set i 0} {$i $num_node} {incr i} {
set n($i) [$ns mpls-node]
}
set node0 [$ns node]
set node1 [$ns node]
#links:
set qtype CBQ
$ns duplex-link $node0 $n(3) 10.0Mb 3ms DropTail
$ns duplex-link $n(0) $n(6) 10.0Mb 2.312773335190996ms $qtype
$ns duplex-link $n(1) $n(0) 10.0Mb 2.9694568204843463ms $qtype
$ns duplex-link $n(2) $n(1) 10.0Mb 1.8352240604833803ms $qtype
$ns duplex-link $n(3) $n(2) 10.0Mb 1.5822334297190923ms $qtype
$ns duplex-link $n(4) $n(0) 10.0Mb 1.4360234541568795ms $qtype
$ns duplex-link $n(5) $n(3) 10.0Mb 2.559521441995941ms $qtype
$ns duplex-link $n(6) $n(3) 10.0Mb 0.7953178172063804ms $qtype
$ns duplex-link $n(7) $n(4) 10.0Mb 2.7512102890042183ms $qtype
$ns duplex-link $n(8) $n(7) 10.0Mb 1.6254465755920127ms $qtype
$ns duplex-link $n(9) $n(3) 10.0Mb 0.5596028576377098ms $qtype
$ns duplex-link $n(7) $node1 10.0Mb 3ms DropTail
}
#end function create_topology
set qs 100
## Queue Monitor for some links
set qmon36 [$ns monitor-queue $n(3) $n(6) ]
set qmon63 [$ns monitor-queue $n(6) $n(3) ]
set sample36 [new Samples]
$qmon04 set-delay-samples $sample36
set sample63 [new Samples]
$qmon40 set-delay-samples $sample63
$ns queue-limit $n(3) $n(6) $qs //
Best regards,
_
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--
Filippos N Kolovos
Software Systems Analyst Engineer
M.Sc. (Eng.) in Data Communications
Automation Networking Department
University of Macedonia Library
Egnatia 156, P.O.Box 1591
540 06 Thessaloniki, Greece
E-Mail: [EMAIL PROTECTED],
[EMAIL PROTECTED]
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