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6

Other answers explaining Nyquist's Sampling Theorem are completely correct. Read those before mine. I'd like to add some information about how details of how you run your simulation can affect the Nyquist frequency, and therefore, in practice, affect the fundamental question of how to choose your time step. As one can easily imagine, tricks that let you ...


6

Having read the above answers I think it's important to point out why you generally use a time step below the upper limit provided by Nyquist's Theorem. The theorem itself describes the maximum number of signals it's possible to send through a telegraph cable and still have them be discernable from one another. That makes the limiting case a sampling ...


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