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Add more x values to the set to be interpolated
The barycentric interpolation algorithm allows easy updating by
adding more points for the polynomial to pass through.
Parameters
----------
xi : array_like
The x coordinates of the points that the polynomial should pass
through.
yi : array_like, optional
The y coordinates of the points the polynomial should pass through.
Should have shape ``(xi.size, R)``; if R > 1 then the polynomial is
vector-valued.
If `yi` is not given, the y values will be supplied later. `yi`
should be given if and only if the interpolator has y values
specified.
Notes
-----
The new points added by `add_xi` are not randomly permuted
so there is potential for numerical instability,
especially for a large number of points. If this
happens, please reconstruct interpolation from scratch instead.
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