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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 of length N1 a sorted list of x-coordinates yi : list of lists of length N1 yi[i] is the list of derivatives known at xi[i] orders : list of integers, or integer a list of polynomial orders, or a single universal order direction : {None, 1, -1} indicates whether the xi are increasing or decreasing +1 indicates increasing -1 indicates decreasing None indicates that it should be deduced from the first two xi

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