add_xi(self, xi, yi=None)
The barycentric interpolation algorithm allows easy updating by adding more points for the polynomial to pass through.
The x coordinates of the points that the polynomial should pass through.
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 :None:None:`yi` is not given, the y values will be supplied later. :None:None:`yi` should be given if and only if the interpolator has y values specified.
Add more x values to the set to be interpolated
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