[ns] Flow monitoring

[Apu Kapadia <akapadia@uiuc.edu>]

Hello, I'm getting the following error within record(). I do the same
thing in finish() and it works fine. Any ideas what could be wrong?

Thanks,
Apu

--------------------
Error:

ns: record: invalid command name ""
    while executing
"$flowmon_id set parrivals_"
    (procedure "record" line 10)
    invoked from within
"record"

--------------------
proc record {} {
 
 // more stuff

    set flowmon [$fmon flows]
    set flowmon_id [lindex $flowmon $testflow_num]
    set test_arrivals [$flowmon_id set parrivals_]
    puts $arrival_file "$now $test_arrivals"
 
 // more stuff

}