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# scipy.interpolate.PiecewisePolynomial.append

`PiecewisePolynomial.``append`(xi, yi, order=None)

  Append a single point with derivatives to the PiecewisePolynomial

  Parameters: | xi : float Point to add. yi : array_like yi is the list of derivatives known at xi. order : int or None, optional A polynomial order, or instructions to use the highest possible order.