Dear All,
I have found in the poly help this sentence:

The orthogonal polynomial is summarized by the coefficients, which can be
used to evaluate it via the three-term recursion given in Kennedy & Gentle
(1980, pp. 343–4), and used in the predict part of the code.

My question: which type of orthogonal polynomials are used by this function?
Hrmite, legendre..
TIA
Giovanni

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