In this [tutorial](http://gazebosim.org/tutorials?tut=random_numbers&cat=math) on Random Numbers, It says that> Gazebo makes use of a random number> generator. By default its seed is set> to PID But we can manually set the> seed too>> for example>> Gazebo can be initialized with a> random number seed on the command line> using the --seed argument:>> gazebo --seed
I tried the command `gazebo --seed 9`
Well, it opened gazebo , but I do not know what was changed or what was different.
I can't understand the tutorial. What is the random number for?? What does gazebo use it for? What if I change it?
I'm quite new in Gazebo, please help to explain.
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