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Integration VIs

Hi,
I wonder if anyone can help. I have a simple control strategy mocked up
in Simulink to convert the Left and right tacho speeds of a robot into X-Y
position. I have been trying to build this strategy in Labview and am
having great difficulty getting the integration VIs to work properly, these
are going to replace all instances of the 1/S integrator function in
Simulink. I understand that the 1/S function uses the trapezoidal method
(i.e. takes present point, adds it to last point, divides by 2 and
multiplies by dt.) Has anyone ever tried to do this kind of thing before,
its just that I'm getting very rough control outputs from the VI.

Regards,
Martin.
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