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quadratic equation interpolation

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assume you have a quadratic equation y=ax^2+bx+c.This script determines a, b , c



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Determine coefficients of a quadratic interpolation equation when having 3 values in x,y.

assume you have a quadratic equation y=ax^2+bx+c and have 3 points in x and 3 points in y. This script determines a, b , c

Comments and Ratings (4)


John D'Errico

John D'Errico (view profile)

abc = polyfit(x,y,2);

would suffice as well. Polyfit is a bit higher quality code too, and it comes with MATLAB since the last 30 years or so. And polyfit has much more capability.

I do find it somewhat laughable that the code fits a QUADRATIC polynomial, but the picture posted shows a curve fit through 4 points, that is clearly NOT quadratic. Hey, it is that new math I suppose. What will they think of next?

And finally, while the title of the submission says something about interpolation, it does no interpolation for you at all.

Yan Cheng

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