NRBCRVDERIVEVAL: Evaluate n-th order derivatives of a NURBS curve.

 usage: skl = nrbcrvderiveval (crv, u, d) 

   INPUT:

   crv : NURBS curve structure, see nrbmak

   u   : parametric coordinate of the points where we compute the derivatives

   d   : number of partial derivatives to compute


   OUTPUT: 

   ck (i, j, l) = i-th component derived j-1 times at the l-th point.

 Adaptation of algorithm A4.2 from the NURBS book, pg127

    Copyright (C) 2010 Carlo de Falco, 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