Cubic Spline

[andreasmalta]

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.

 

[IRstuff]

Is this for school? Student posting is not allowed.

TTFN
I can do absolutely anything. I'm an expert!
faq731-376 forum1529

 

[cibachrome]

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.