Hi everybody,
I am trying to use xgraph. It is installed in my machine and running. I
modified my code according to available tutorials (as far as I could) to see
xgraph results. When the code is run, xgraph starts but displays no results. An
error message is "Bad x-value 'r' on line 6153 of file mob.tr" is dislpayed.
Same error is repeated several times on Xterm window with dfferent line numbers
refering to the same trace file mob.tr.
Please help me out at this
Faraz
#Create a simulator object
set ns [new Simulator]
#Define different colors for data flows (for NAM)
$ns color 1 Blue
$ns color 2 Red
set tracefd [open mob.tr w]
$ns trace-all $tracefd
#Open the NAM trace file
set nf [open out.nam w]
$ns namtrace-all $nf
#Define a 'finish' procedure
proc finish {} {
global ns nf tracefd
$ns flush-trace
#Close the NAM trace file
close $nf
close $tracefd
#Execute NAM on the trace file
exec /home/faraz/Desktop/ns-allinone-2.33/nam-1.13/nam out.nam
exec /home/faraz/Desktop/ns-allinone-2.33/ns-2.33/xgraph mob.tr &
exit 0
}
proc record {} {
global tracefd lmsink
set ns [Simulator instance]
set time 0.5
set bw [$lmsink set bytes_]
set now [$ns now]
puts $tracefd "$now [expr $bw/$time*8/1000000]"
$lmsink set bytes_ 0
$ns at [expr $now+$time] "record"
}
#Create four nodes
set n0 [$ns node]
set n1 [$ns node]
set n2 [$ns node]
set n3 [$ns node]
#Create links between the nodes
$ns duplex-link $n0 $n2 2Mb 10ms DropTail
$ns duplex-link $n1 $n2 2Mb 10ms DropTail
$ns duplex-link $n2 $n3 1.7Mb 20ms DropTail
#Set Queue Size of link (n2-n3) to 10
$ns queue-limit $n2 $n3 10
#Give node position (for NAM)
$ns duplex-link-op $n0 $n2 orient right-down
$ns duplex-link-op $n1 $n2 orient right-up
$ns duplex-link-op $n2 $n3 orient right
#Monitor the queue for link (n2-n3). (for NAM)
$ns duplex-link-op $n2 $n3 queuePos 0.5
set lmsink [new Agent/LossMonitor]
$ns attach-agent $n3 $lmsink
#Setup a TCP connection
set tcp [new Agent/TCP]
$tcp set class_ 2
$ns attach-agent $n0 $tcp
set sink [new Agent/TCPSink]
$ns attach-agent $n3 $sink
$ns connect $tcp $sink
$tcp set fid_ 1
#Setup a FTP over TCP connection
set ftp [new Application/FTP]
$ftp attach-agent $tcp
$ftp set type_ FTP
#Setup a UDP connection
set udp [new Agent/UDP]
$ns attach-agent $n1 $udp
set null [new Agent/Null]
$ns attach-agent $n3 $null
$ns connect $udp $null
$udp set fid_ 2
#Setup a CBR over UDP connection
set cbr [new Application/Traffic/CBR]
$cbr attach-agent $udp
$cbr set type_ CBR
$cbr set packet_size_ 1000
$cbr set rate_ 1mb
$cbr set random_ false
#Schedule events for the CBR and FTP agents
$ns set 0.0 "record"
$ns at 0.1 "$cbr start"
$ns at 1.0 "$ftp start"
$ns at 4.0 "$ftp stop"
$ns at 4.5 "$cbr stop"
#Detach tcp and sink agents (not really necessary)
#$ns at 4.5 "$ns detach-agent $n0 $tcp ; $ns detach-agent $n3 $sink"
#Call the finish procedure after 5 seconds of simulation time
$ns at 5.0 "finish"
#Print CBR packet size and interval
puts "CBR packet size = [$cbr set packet_size_]"
puts "CBR interval = [$cbr set interval_]"
#Run the simulation
$ns run
