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Plotting a Difference wave in Excel

  1. Nov 10, 2012 #1
    I have plotted two approximately sinusoidal waves in one Excel graph. Both waves are voltage, on the y-axis, against time the x-axis. Though both waves are not identical, being out of sync a little.


    The first wave has quite a lot more readings which make it than the second wave.


    If I want to produce another Excel graph depicting a wave of the difference in these two, how would I do that?


    Thanks for any advice!
     
  2. jcsd
  3. Nov 10, 2012 #2

    Simon Bridge

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    You have a graph of v(t) vs t and i(t) vs t?

    To be meaningful, you need to take the difference between terms with equal time-stamps.
    This will usually mean doing some interpolation - though, if the two graphs share a lot of the same times, you may get away with just plotting the differences of the times they have in common.

    iirc excell has interpolation functions - so it is probably easiest to just standardize the two data-sets and subtract them.
     
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