Recent content by jkristoff

  1. J

    Parabolic curve fit to x,y data

    Thank you very much for your help thus far. This is not to be considered a 1 hour homework problem. I'm involved in an independent study with our student group. We are trying the characterize shapes of liquids measured in rotating containers. The x,y data is generated from a non-contact...
  2. J

    Parabolic curve fit to x,y data

    Thanks for your help! I am trying your first-reply suggestion using matrices in excel, but having trouble so far. How did you include the equality constraint? Regarding the second-post approach#2, you can rotate a normal parabola (B=0) symmetrical about the y-axis centered at the origin using...
  3. J

    Parabolic curve fit to x,y data

    Homework Statement Given a series of measured data points (>1000) x,y find the best fit parabolic curve where the constant A (below) is given. Homework Equations General 2nd deg equation describes conic sections: Ax2+Bxy+Cy2+Dx+Ey+F=0 for a parabola B^2=4AC, AND in this case B<>0...
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