I want to fit cubic spline functions with 5 B-spline basis functions to my data. In this case I have 9 knots as following : k1, k2, k3, k4, k5, k6, k7, k8, k9. k4 and k6 are boundary knots and k5 is interior knot. That is, the interval [k4,k6] is interesting interval and the data is in this interval. k3 is an exterior knot that I want to predict for it. How can I do this? Is there a way?
What have you tried so far? Have you used Matlab and the Curve Fitting toolbox?
https://au.mathworks.com/products/curvefitting.html
Sigfredo Fuentes
Hello. I thank you for your answer. Unfortunately I haven`t used Matlab and I use R software. I read some papers about extrapolation method.
Refer to one of the master students of Prof. Parsian who graduated in 92.
If I remember, he was Mr. Shahpari
Ebrahim Bonyadi
Thank you but unfortunately I can`t find Mr. Shahpari`s thesis at irandoc website!
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