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Cubic Spline

Cubic Spline

Cubic Spline

(OP)
I need to fit a cubic spline to a sequence of N knots (xi, yi), 1 < i < N

My xi are are distinct, in ascending order but not necessarily equally spaced. I need to write a program in Matlab to solve for the curvatures si.

Can anyone can help me on how to go around in solving this.

RE: Cubic Spline

Matlab has a Spline Toolbox. You don't fit a spline to knots, you fit it to an N-Dim set of raw data points. The knots are locations where the (cubic in your case) fitting equations are joined. No need to have ascending order either.

It's a least squared error type solution. Endpoints match, derivatives at endpoints match.

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