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Least Square  B Spline (with Data and Knot Input) http://forum.alglib.net/viewtopic.php?f=2&t=3798 
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Author:  Nikolai [ Mon Mar 27, 2017 9:05 am ] 
Post subject:  Least Square  B Spline (with Data and Knot Input) 
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 
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