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# scipy.interpolate.PiecewisePolynomial.extend

`PiecewisePolynomial.``extend`(xi, yi, orders=None)

  Extend the PiecewisePolynomial by a list of points

  Parameters: | xi : array_like A sorted list of x-coordinates. yi : list of lists of length N1 `yi[i]` (if `axis == 0`) is the list of derivatives known at `xi[i]`. orders : int or list of ints, optional A list of polynomial orders, or a single universal order.