Given the set of points, let say (xo, yo), (x1, y1),.....,(xn, yn) how to find polynomial via spline interpolation (Cubic/quadratic)

Given the set of points, let say (xo, yo), (x1, y1),.....,(xn, yn) how to find polynomial via spline interpolation (Cubic/quadratic)

[John D'Errico]

What is your question? Is this homework? if so, then it is time to do your work.

If you need to generate a spline, then surely spline.m is the answer, or pchip.m, or perhaps have a go at spapi.m. So I'm not at all sure what is the actual question here, or at least the reason behind your question. Surely if I wanted to fit an interpolating spline, I would have started with spline.m.

Answer 1

[Image Analyst]

I'm attaching my spline and polyfit demos. Adapt as needed.

As you know, with splines you get a new polynomial between every pair of points.

Answer 2

[Muhammad Usman Saleem]

try from this

http://www.mathworks.com/matlabcentral/answers/265845-1d-interpolation-from-multiple-text-files