(u, degree, knotvector, num, idx)
return (u - knotvector[idx]) / (knotvector[idx + degree + 1 + num] - knotvector[idx])
Computes :math:`\\alpha_{i}` coefficient for knot removal algorithm.

    Please refer to Eq. 5.29 of The NURBS Book by Piegl & Tiller, 2nd Edition, p.184 for details.

    :param u: knot
    :type u: float
    :param degree: degree
    :type degree: int
    :param knotvector: knot vector
    :type knotvector: tuple
    :param num: knot removal index
    :type num: int
    :param idx: iterator index
    :type idx: int
    :return: coefficient value
    :rtype: float
Computes :math:`\\alpha_{i}` coefficient for knot removal algorithm.
Computes : math : \\ alpha_ { i } coefficient for knot removal algorithm .
def knot_removal_alpha_i(u, degree, knotvector, num, idx):
    """ Computes :math:`\\alpha_{i}` coefficient for knot removal algorithm.

    Please refer to Eq. 5.29 of The NURBS Book by Piegl & Tiller, 2nd Edition, p.184 for details.

    :param u: knot
    :type u: float
    :param degree: degree
    :type degree: int
    :param knotvector: knot vector
    :type knotvector: tuple
    :param num: knot removal index
    :type num: int
    :param idx: iterator index
    :type idx: int
    :return: coefficient value
    :rtype: float
    """
    return (u - knotvector[idx]) / (knotvector[idx + degree + 1 + num] - knotvector[idx])
def knot_removal_alpha_i ( u , degree , knotvector , num , idx ) : return ( u - knotvector [ idx ] ) / ( knotvector [ idx + degree + 1 + num ] - knotvector [ idx ] )