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Homework Help: Creating lung compliance curves but I'm terrible at the math/graphing

  1. Dec 4, 2013 #1
    1. The problem statement, all variables and given/known data

    I am trying to replicate the curves in the attachment, but since I am a physiologist it has been quite a while since I've done graphing. I am simply looking for an easy way to replicate these three curves. This is for a practice exam I am creating for first year medical students. The graphing program I got from sourceforge allows you to create these curves by inserting a function in the form of f(x) = or creating a point series.

    2. Relevant equations

    I believe the normal curve is roughly f(x) = √x but, I wish I knew what function to insert to make the line cross the X axis at +2.5 instead of 0. I am clueless how to create the shapes of the other two.

    3. The attempt at a solution

  2. jcsd
  3. Dec 4, 2013 #2


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    Staff: Mentor

    I don't see an attachment -- try again?
  4. Dec 4, 2013 #3


    Staff: Mentor

    If your curve has the same shape as f(x) =√x, it can be translated to the right by 2.5 units to have an x-intercept at (2.5, 0). That would be y = f(x - 2.5) = √(x - 2.5)
  5. Dec 4, 2013 #4
    I'm sorry, I think it should be attached now. Thanks for that first answer Mark. Now the other 2 curves should be in the attachment and I need a way to recreate them.

    Attached Files:

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