c : ndarray, size (k, m, ...)
Additional coefficients for polynomials in intervals
self.x[-1] <= x < x_right[0], x_right[0] <= x < x_right[1],
..., x_right[m-2] <= x < x_right[m-1]
x : ndarray, size (m,)
Additional breakpoints. Must be sorted and either to
the right or to the left of the current breakpoints.
right : bool, optional
Whether the new intervals are to the right or to the left
of the current intervals.
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