[Playerstage-users] Problem with coordinates and speed

[Tsardoulias M. <ets...@au...>]

Hi

I I'm trying to implement a FastSLAM algorithm but I have some problems 
with the x,y coordinates and the speeds.

I have a "for" command that runs 10 times, each time for 1 second. I 
also used the command

pp.SetSpeed(-0.1, 0);

So I guess that the robot should move backwards for 1 meter by the end 
of the "for".

I also print the x coordinate as well as the x speed during the "for" 
with the following command:

std::cout<<pp.GetXPos()<<" "<<pp.GetXSpeed()<<std::endl;

I get these:

0 0
-1.8496 0
-1.8496 0
-1.8496 0
-1.8496 0
-1.8496 0
-1.8496 0
-1.8587 0.0431042
-1.8587 0.0431042
-1.8782 0.101228

So the output shows that the robot moved 0.03 meters (!) and in the 7 
first seconds it's speed was 0!

Although the robot seems to move normally in the simulator (USARSim).

What is going on??

Manos