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Plotting a Difference wave in Excel

  • 10-11-2012 4:09pm
    #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
    Victor
    Registered Users, Registered Users 2 Posts: 78,580 ✭✭✭✭Victor


    Smythe wrote: »
    The first wave has quite a lot more readings which make it than the second wave.
    I think the gremlins got to this sentence. :)

    You don't give the characteristics of your lines.

    I've made line 1 and 2. Line 2 is 90 degrees out of phase and has half the wave length. Depending on the characteristics, the third wave may have a different wavelength (wavelength = 1/frequency) or indeed be flat. Pitch will always be between -1 and 1.

    You can then subtract one from the other and plot that.

    Are these the same thing:
    * differences between the sines and
    * sines of the differences?

    I've had to use Open Office, you can finesse things a bit more with Excel.

    228022.PNG


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