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Exponential or not?

  1. Sep 22, 2014 #1
    I have a curve I obtained in COMSOL representing a electric field for m structure. I have to figure how to determine when the curve starts to become exponential decaying at certain regions.

    Any idea how to determine when the curve starts becoming exponential decaying from a plot?
     
  2. jcsd
  3. Sep 22, 2014 #2

    mathman

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    Plot the curve on semi-log paper. A straight line there will be equivalent to exponential on a linear plot.
     
  4. Sep 29, 2014 #3
    How do I see when the plot is no longer linear? I am estimating the curves R2-values (coefficient of determination).

    I get values like,

    1.0
    0.9998
    0.9953
    0.9915
    0.95

    etc

    I just don't know how to determine when it stops being linear. Do you have any suggestions?
     
  5. Sep 29, 2014 #4

    mathman

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    I don't understand your concern. When you plot it and it starts to curve then it is no longer linear.
     
  6. Sep 29, 2014 #5

    WWGD

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    Low values of R^2 go together with a low (linear) goodness-of-fit .
     
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