Hello Everyone,

I'm a very new user to both NS-2 and awk and struggling quite a bit. I have a created a wireless trace in NS2 which is of the format as given below:

s 0.029290548 _1_ RTR --- 0 message 32 [0 0 0 0] ------- [1:255 -1:255 32 0]
s 1.119926192 _0_ RTR --- 1 message 32 [0 0 0 0] ------- [0:255 -1:255 32 0]
M 10.00000 0 (5.00, 2.00, 0.00), (20.00, 18.00), 1.00
s 10.000000000 _0_ AGT --- 2 tcp 40 [0 0 0 0] ------- [0:0 1:0 32 0] [0 0] 0 0
r 10.000000000 _0_ RTR --- 2 tcp 40 [0 0 0 0] ------- [0:0 1:0 32 0] [0 0] 0 0
s 12.941172739 _1_ RTR --- 3 message 32 [0 0 0 0] ------- [1:255 -1:255 32 0]
s 13.242656084 _0_ RTR --- 4 message 32 [0 0 0 0] ------- [0:255 -1:255 32 0]
s 16.000000000 _0_ AGT --- 5 tcp 40 [0 0 0 0] ------- [0:0 1:0 32 0] [0 0] 0 0
r 16.000000000 _0_ RTR --- 5 tcp 40 [0 0 0 0] ------- [0:0 1:0 32 0] [0 0] 0 0
s 24.799296167 _1_ RTR --- 6 message 32 [0 0 0 0] ------- [1:255 -1:255 32 0]
s 27.719583723 _0_ RTR --- 7 message 32 [0 0 0 0] ------- [0:255 -1:255 32 0]
s 28.000000000 _0_ AGT --- 8 tcp 40 [0 0 0 0] ------- [0:0 1:0 32 0] [0 0] 0 0
r 28.000000000 _0_ RTR --- 8 tcp 40 [0 0 0 0] ------- [0:0 1:0 32 0] [0 0] 0 0
s 39.083332528 _1_ RTR --- 9 message 32 [0 0 0 0] ------- [1:255 -1:255 32 0]
s 40.918940913 _0_ RTR --- 10 message 32 [0 0 0 0] ------- [0:255 -1:255 32 0]
M 50.00000 1 (390.00, 385.00, 0.00), (25.00, 20.00), 15.00
s 52.000000000 _0_ AGT --- 11 tcp 40 [0 0 0 0] ------- [0:0 1:0 32 0] [0 0] 0 0
r 52.000000000 _0_ RTR --- 11 tcp 40 [0 0 0 0] ------- [0:0 1:0 32 0] [0 0] 0 0
s 53.478111556 _1_ RTR --- 12 message 32 [0 0 0 0] ------- [1:255 -1:255 32 0]
s 54.709362820 _0_ RTR --- 13 message 32 [0 0 0 0] ------- [0:255 -1:255 32 0]
s 65.134134662 _1_ RTR --- 14 message 32 [0 0 0 0] ------- [1:255 -1:255 32 0]
s 69.500212994 _0_ RTR --- 15 message 32 [0 0 0 0] ------- [0:255 -1:255 32 0]
r 69.501265756 _1_ RTR --- 15 message 32 [0 ffffffff 0 800] ------- [0:255 -1:255 32 0]
s 76.429530123 _1_ RTR --- 16 message 32 [0 0 0 0] ------- [1:255 -1:255 32 0]
r 76.430622539 _0_ RTR --- 16 message 32 [0 ffffffff 1 800] ------- [1:255 -1:255 32 0]
s 76.430622539 _0_ RTR --- 2 tcp 80 [0 0 0 0] ------- [0:0 1:0 32 1] [0 0] 0 0
s 76.430622539 _0_ RTR --- 5 tcp 80 [0 0 0 0] ------- [0:0 1:0 32 1] [0 0] 0 0
D 76.430622539 _0_ IFQ ARP 2 tcp 80 [0 0 0 800] ------- [0:0 1:0 32 1] [0 0] 0 0
s 76.430622539 _0_ RTR --- 8 tcp 80 [0 0 0 0] ------- [0:0 1:0 32 1] [0 0] 0 0
D 76.430622539 _0_ IFQ ARP 5 tcp 80 [0 0 0 800] ------- [0:0 1:0 32 1] [0 0] 0 0
s 76.430622539 _0_ RTR --- 11 tcp 80 [0 0 0 0] ------- [0:0 1:0 32 1] [0 0] 0 0
D 76.430622539 _0_ RTR CBK 8 tcp 80 [0 0 0 800] ------- [0:0 1:0 32 1] [0 0] 0 0
D 76.430622539 _0_ RTR CBK 11 tcp 80 [0 0 0 800] ------- [0:0 1:0 32 1] [0 0] 0 0
s 81.503053035 _1_ RTR --- 17 message 32 [0 0 0 0] ------- [1:255 -1:255 32 0]
r 81.503945197 _0_ RTR --- 17 message 32 [0 ffffffff 1 800] ------- [1:255 -1:255 32 0]
s 83.261238775 _0_ RTR --- 18 message 44 [0 0 0 0] ------- [0:255 -1:255 32 0]
r 83.262226850 _1_ RTR --- 18 message 44 [0 ffffffff 0 800] ------- [0:255 -1:255 32 0]



I'm using an awk file in order to read the traces but I'm getting an error like "FATALivide by zero attempted"

I typed it in as "awk -f delay.awk simple.tr" ( I dunno if tht is right)

delay.awk
----------

Code:

BEGIN {highest_packet_id = 0;}
{
 action = $1;
 time = $2;
 node =$3;
 tracename = $4;
 type = $7;
 packet_id =$6;
 if (packet_id > highest_packet_id)
   highest_packet_id = packet_id;
 if (action == "s"){
 if (type == "cbr" && tracename == "AGT"){
    send_time[packet_id] = time;}
#else {send_time[packet_id] = 0;}
}
else if (action == "r"){
    if (type == "cbr" && tracename =="AGT"){
       rcv_time[packet_id] = time;
   }
#else{rcv_time[packet_id] = 0;}
 }
}
 END {packet_no = 0; total_delay = 0;
       for (packet_id = 0; packet_id <=highest_packet_id; packet_id++){
            if ((send_time[packet_id]!=0) && (rcv_time[packet_id]!=0)){
                start = send_time[packet_id];
                end = rcv_time[packet_id];
               packet_duration = end-start;}
else
      packet_duration = -1;
if (packet_duration > 0)
{packet_no++;
  total_delay = total_delay + packet_duration; }
}
   printf("%d %f %f\n", packet_no, total_delay, total_delay/packet_no);
}

Again I'm not sure if this is the right file to use, as it was mailed to me saying that I use this for delay. Should I make changes here ?? Should I use some other awk file ??? Should I make any other changes ??? Any help would be most welcome. Thank you so much for your time and help !!