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Unit step function

  1. Aug 20, 2009 #1
    if you subtract two delayed unit step functions, is the resultant a unit step function too? what is the value at the last point? 0 or 1? similarly, if you add 2 unit step functions will the magnitude of the resultant funtion be 1 or 2?
     
  2. jcsd
  3. Aug 20, 2009 #2
    not exactly, you need to deal with different segements of you input function separately.
     
  4. Aug 20, 2009 #3

    Born2bwire

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    Just draw them out and do the additions and subtractions that way. The step function is rather simple so a quick pictoral representation should show you your answer.
     
  5. Sep 1, 2009 #4
    i still dont get it. could u just tell me that when u subtract 2 unit step functions, will there or will there not be a discontinuity at the last point?
     
  6. Sep 1, 2009 #5

    Born2bwire

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    What is the last point? This depends completely on what the actual step functions are that you are operating on. Just draw the step functions out on a graph, one above the other and it should be apparent how the resultant plot should look like when you add or subtract the two.
     
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