AWK scripts not running in NS2

HI ,
       These days i just identified that most of the NS2 Users are facing problem with running AWK scripts and getting final simulation results.

Here are some common mistakes :

   1) Running with out generating the Trace file.
   2) Running with out testing the trace file format(old/new)
   3) Division by zero awk script error.
   4) Using New trace file with old awk script combination or Old trace file with New awk script-->This is the major mistake.

Solution:

    Before you proceed with applying awk scripts, Make sure which stage you are in currently.
In my view the stages are

Stage 1: creation of scenario(environmental setup) and creating TCL file.Important step check for new trace file or old trace file.....

• If you want new trace file (contains energy and node position details) : put $ns use-newtrace in your TCL file. 
• If you want old trace file format  : just comment the above command in your TCL file with #.

Stage 2:  Execution of TCL file and getting TRACE file (.tr file) . Generated with run the command  $ns example.tcl
Stage 3:  Download or modify the AWK scripts according to your scenario
Stage 4:  Use xgraph to generate graph associated to your results.

Checking Awk script for Old/New trace file format:

   AWK scripts are very useful to apply and execute trace file. important aspect is checking the column values in the awk script.

         AWK script for New trace file:   

•   It contains more than 35 columns. which gives energy in joules, (x,y,z)axis location of node, send,receive, etc.

  •  So if you found any value like $16 or $34 or $23  means that the script is for new trace file . Use  when you need energy calculation apart from that pdf, jitter,throughput,delay else go with Old awk script.

           AWK script for Old trace file: 

•   column values will be less than 10.   you can see like $5 ,$9  in the script.

Now please check the trace file whether it is old or new  and then apply associated AWK script..Search appropriate AWK script and use.

NOTE: 
        Please open trace file and now check how many columns are there. old trace file for example

 s     2.556838879    _0_     RTR      ---   0 AODV    48    [0 0 0 0] -------    [0:255 -1:255 30 0] 


 Columns in AWK script
-------------------------------
$1-->s
$2-->  2.556838879
$3-->_0_
$4--> RTR     


Hope this Post helps you folks