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# scipy.interpolate.PchipInterpolator.extend

`PchipInterpolator.``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 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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