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You are right. Saying 45 degrees does sound arbitrary, and it is with respect to the robot itself. But lets say the robot is on the floor which is our grid, at the origin. Both wheels are spinning at constant speed and it is merrily spinning on the spot. Now I want to move it 45 degrees to the origin. Or along the +ve X or Y axis or the -ve X or Y axis. How should I adjust the relative speeds of the wheels to make it drift/hover in that direction without stopping the rotation. Even if it doesn't drift in a straight line, can i made it sinusoidally move it along a 45* path for example.
Thanks for the quick reply David. Can you explain the second part of the parametric function? Lets say I am spinning the robot on the spot. I want to "Move" at a 45degree angle (lets say) how/where do I get the coordinate from that I can plug into the above equation?