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Plotting a Difference wave in Excel

  • 10-11-2012 04:07PM
    #1
    Smythe
    Registered Users, Registered Users 2 Posts: 434 ✭✭


    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!


Comments

  • #2
    citrus burst
    Registered Users, Registered Users 2 Posts: 147 ✭✭citrus burst


    What do you want to graph? The amplitude? or the phase shift?


  • #3
    Smythe
    Registered Users, Registered Users 2 Posts: 434 ✭✭Smythe


    citrus burst wrote: »
    What do you want to graph? The amplitude? or the phase shift?


    I want to plot the difference between the two waves (i.e. the residuals of these) against time.

    One wave is a measured wave based upon actual measurements, the other is the theoretical wave if everything in the experiment was 100% perfect.
    [FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman][/FONT][/FONT]


  • #4
    Gurgle
    Closed Accounts Posts: 5,058 ✭✭✭Gurgle


    If you've got measured data in column A and ideal data in Column B, then you just need a formula in column C where Cn = An - Bn


  • #5
    Donne
    Registered Users, Registered Users 2 Posts: 190 ✭✭Donne


    Just to but in have you ever heard of Gnuplot.
    You can run it in Windows, though it was ororgiinally developed in Unix/Linux.

    It's the standard for science/engineering graph plots.


  • #6
    Victor
    Registered Users, Registered Users 2 Posts: 78,652 ✭✭✭✭Victor


    Ooops, I meant to respond to this last month. :)

    Obviously your data will be different from mine.


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