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Homework Help: Writing down the step function

  1. Oct 10, 2006 #1
    Hi there,

    I'm stuck on getting my step function set up. the function is:

    f(t)= 0, t<0
    (a/b)*t, 0<t<b
    a, t>b

    where a and b are just constants.

    Here's my step function of the first two intervals...the first one I didn't do anything to it since it's zero, so I got:

    f(t)=u0(t)(a/b)*t

    now I'm stuck on how to get the step function for the last interval.
    I appreciate the help, thank you. :smile:
     
  2. jcsd
  3. Oct 10, 2006 #2
    shift it

    Think of it this way. You have a function x(t). This function would be x(0) at zero, right? But we want it to be x(0) at b not at zero, right? So what would we have to subtract off the t in x(t) inorder to get the function shifted over? ie x(t-?). Try out some values. Don't think too much, it is easy.
     
  4. Oct 10, 2006 #3
    I'm guessing here, is it (t-b)?
     
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