How to find minima from a fitted 3rd order polynomial

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Gollapalli Prince il 5 Mar 2019

Risposto: Torsten il 5 Mar 2019

As shown below, my data points are in blue

grey plot is fitted using 2nd order polynomial

Red plot is fitted using 3rd order polynomial, which seems to be better than 2nd order polynomial (quadratic fit)

How to find the minimum value of y for this 3rd order ploynomial ?

Torsten il 5 Mar 2019

Solve y'(x)=0 for x and check whether f''(x) > 0.

MATLAB Mathematics Elementary Math Polynomials

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