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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