In-Reply-To: <Chameleon.879877602.neuwirth@loyd.smc.univie.ac.at> Spot on Erich, This is the identical equivalent of driving a floor turtle with differential inputs to the two motors. And, of course, it implies the need for a physical operation and hence the expenditure of energy to maintain the circular movement - a point noted by a chap called Newton. By the way, if energy is expended, can the story be without end? Your second point I never disputed. A sample of a sinusoid of appropriate frequency is a good enough approximation to reproduce that sinusoid digitally. It is not, however, a sinusoid any more. Michael Doyle (aka Micheal O Duill) 37 Bright Street SKIPTON BD23 1QQ UK Tel/fax: +44 (0)1756 794601 Email: mikedoyle@cix.co.uk --------------------------------------------------------------- Please post messages to the Logo forum to logo-l@gsn.org. Mail questions about the list administration to logofdn@gsn.org. To unsubscribe send unsubscribe logo-l to majordomo@gsn.org.
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