VECROT: Transformation matrix for a rotation around the axis given by a vector. 
 
 Calling Sequence:
 
   rx = vecrot (angle, vector);
 
 INPUT:
 
   angle : rotation angle defined in radians
   vector: vector defining the rotation axis

 OUTPUT:
 
   rx: (4x4) Transformation matrix.
 
 
 Description:
 
   Return the (4x4) Transformation matrix for a rotation about the axis
   defined by vector, and by the given angle.
 
 See also:
 
    nrbtform

    Copyright (C) 2011 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