Compute the coefficient matrix for non-uniform B-splines subdivision.

 This represents the B-spline basis given by a coarse knot vector
  in terms of the B-spline basis of a finer knot vector.

 The function is implemented for the univariate case, based on
  Algorithm A5.4 from 'The NURBS BOOK' pg164.


 Calling Sequence:
 
    S = basiskntins (deg, kc, kf);

    INPUT:
   
      deg - degree of the first knot vector
      kc  - coarse knot vector
      kf  - fine knot vector
   
    OUTPUT:
   
      S - The matrix relating the two spaces, of size (deg-nu, deg-nt) 
           with nu = numel(u)-deg-1, nt = numel(t)-deg-1
   
    Copyright (C) 2015, 2016, 2018 Rafael Vazquez

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

Package: nurbs