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Unit step function

  1. Aug 13, 2010 #1
    what does the u(-t) mean in unit step funtion in basic function of signal and system?how can be time taken as -ve?
  2. jcsd
  3. Aug 13, 2010 #2
    u(t) is unit step function right? It means that u=1 for t>=0 and u=0 otherwise.
    In the same way u(-t) can be understood. That is u=1 for t<=0 and u=0 otherwise.
    Here time is not taken as -ve but only the argument to u is taken as -ve.
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