Matlab does not show the curve equation in basic fitting

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john white
john white on 15 Feb 2021
Commented: dpb on 15 Feb 2021
I have a code which I plot some datas then I want to get the equation of the plotted curve so I used basic fitting , spline interpolant is fit with plotted curve but when I check the ((show equations)) it just write the ((cubic spline interpolant)) in the figure window and didn't show the equation of the fitting curve
  1 Comment
dpb on 15 Feb 2021
Because there is no simple expression like a quadratic for the spline interpolant; it's a series of cubics between each breakpoint.

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Answers (1)

John D'Errico
John D'Errico on 15 Feb 2021
You misunderstand splines. A spline does not have a simple equation you can write down. And while in theory, you could write down SOMETHING, it would be a terribly dense, lengthy thing. And unless you understand splines sufficiently well, it might not make a lot of sense to you anyway.
You can use a spline to interpolate, approximate, and predict values. However, there is no simple equation.

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