forum.alglib.net

Dear Sergey,
I would need to build a function of an Cubic B Spline with N Data Points and B Knot Points (weight would be optional).

For Example N= 400
X=(1,2,3,4..400)
Y= a+b*X+c*X^2+d*X^3 + Noise
B=1,30,70,250,400

So i would like to get 4 Cubic Polynomials (first from 1 till 30, second from 30 till 70, third from 70 till 250 and last from 250 till 400).

Would this be possible with the alglib lib?

Thanks a lot

Best regards

Nikolai