[ns] aw k problem

[cool]

Hi,

I have simulated the wpan_demo4.tcl in wpan example folder, but I am facing
problem in evaluate the network performance (e.g. end-to-end delay, average
throughput, packet loss ratio) with awk file. It always comes out with fatal
error: attempted to divide by zero. 

How to solve it?? URGENT.

Thanks.
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