[ns] how to change the speed of node while randomly moving

[Semra YILMAZ]

Hi all,
I am using the random motion of the nodes in my wireless scenario. In the below line, which is not random, we can adjust the speed of the moving nodes.
 
$ns at $time $node setdest <x2> <y2> <speed>
 
My question is that how i can change only the speed of the moving node in tcl, although the nodes still moving random fashion.
 
Thanks in advance.
 
Semra
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