discrete.py 文件源码

def get_points_and_values(self, points = None, parameter = None, derivative = 0, extrapolation = 1, error = None):
    """Calculates the values of the spline along the sample points

    Arguments:
      points (array or None): the sample points for the values, if None use internal samples points
      parameter (array or None): the bspline parameter, if None use internal parameter
      derivative (int): the order of the derivative
      extrapolation (int):  0=extrapolated value, 1=return 0, 2=raise a ValueError, 3=boundary value

    Returns:
      array: tha sample points
      array: the values of the spline at the sample points
    """
    points = self.get_points(points, error = error)      

    if parameter is None:
      parameter = self._parameter;

    if points is self._points and derivative == 0:
      if parameter is self._parameter and self._values is not None: #cached version
        return points, self._values;
      if self.with_projection:
        return points, self.projection.dot(parameter);

    # full interpolation
    pp = np.pad(parameter, (0,self.degree+1), 'constant');
    tck = (self._knots_all, pp, self.degree);
    return points, splev(points, tck, der = derivative, ext = extrapolation);