I'm just getting to learn ns-2 and running a basic test. My TCL file works if 
$num_row is e.g. 10 (10*10 grid and 100 nodes) but if I set it to 2 or 5 I get 
segmentation fault after around one or two minutes of the code running. 
Attached is the TCL and the TR file. I do appreciate it. Any thoughts?



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