MATLAB Tutorial Lesson #08: Interpolation and Polynomial Curve Fitting

Description

[matej]

this was great! I really appreciate when someone is able to create such a comprehensive lecture. Thank you!!

[marcelaburgos]

Can you show how can i write the interpolation, but for 3d points (x, y, z)

[melisakalafat]

great tutorial!! it helped me a lot thank you

[shadmanshahriar]

It was a great tutorial , can you please supply the code . It would be very helpful .

[mirzasalkic]

Can we write cubic spline instead of order and get the coefficients like we did when setting the order of the polynomial?

[alperensglm]

can you please help me about my homework? i can not do anything about matlab programming because of pandemic situations. even i couldn't get lessons well. Please sir, it's so important for me my question is;
Natural Cubic Spline Interpolation
Choose x0, x1, x2, x3 and y0, y1, y2, y3. Write an .m file to compute the third order polynomials for the intervals [x0, x1], [x1, x2], [x2, x3]. Plot the functions and the points xi, yi on the same figure. Figure should clearly show that the polynomials pass through the points.
I will choose my own xi, yi and test your code

[ziia]

great... by the way interp1 or interpl ?

[Devishhike]

What will happen if x(i) will be equal to x(i+1)? I mean array of x will be like x= [-2 1 1 2 3 3 4]? All codes provide NaN coefficient in polinom because division by 0 how to avoid it. could u give any suggestions?