jsims@vuse.vanderbilt.edu (J. Robert Sims) (02/26/91)
>> Hello world! >> >> We have some problems to define discrete Heaviside step function >> U(t) and it's derivative Unit impulse SIGMA(t) in the same >> directory, and after that use: 'dt(U(5*t))' EVAL. >> > >Maybe you're talking about a different Unit impulse function, but the one >I'm familiar with (what my Signals book and Probability and Random Variables >book call delta(t)) is defined as a "function" having the following >properties... > >delta(t) = 0, t<>0 >and the integral of delta(t) with respect to t over all time equals 1. > >delta(0) approaches infinity, not 1. The integral of it from 0- to 0+ (or a >y interval containing 0) does equal 1. > >-Randy Weems >RJW0180@TNECH.BITNET The unit impulse function for _discrete_ processing is one at 0. Otherwise it is just called an impulse function. For all the people who can't mail to hpcvbbs, the address is: akcs.user%hpcvbbs.cv.hp.com@relay.hp.com Rob jsims@vuse.vanderbilt.edu