Matlab does not show the curve equation in basic fitting

Hi

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

[dpb]

Because there is no simple expression like a quadratic for the spline interpolant; it's a series of cubics between each breakpoint.

Answer 1

[John D'Errico]

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.