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Math Help - Cubic Spline Interpolation...Wtf I don't understand

  1. #1
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    Cubic Spline Interpolation...Wtf I don't understand

    I have a data:

    0.5--0.000346
    1.0--0.046467
    1.5--0.219274
    2.0--0.358386
    2.5--0.418706
    3.0--0.439846
    3.5--0.44676
    4.0--0.448971

    They ask do cubic spline to interpolate the inflection point. I don't understand anything. Whoever invented cubic spline was a math nerd or something, I'm an engineer and I don't understand.

    I'll tell you what I do understand. I understand that I need N-1 cubic equations, 1 in between each point, and for each equation I need to find a,b,c and d. I already used a cubic approximation around the inflection point successfully but that's only one equation for all the points...cubic spline is several equations, 1 in between each point so it's not cubic spline.

    Can someone show me how this works or give me a link to a NUMERICAL, STEP BY STEP example?

    Thanks guys!
    Last edited by Provoke; November 28th 2010 at 02:05 PM.
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