POLYFIT -- A package for polynomial fitting. Polynomials P(x) of arbitrary degree are fitted with or without constraints, to a given set of points (X n ,Y n ), n=1,⋯,N; N>1, using the least squares method. A weight ω n may be assigned to each point and/or an error – or fluctuation – ΔY n to the respective Y n ’s. Two kinds of constraints may be specified: 1) Fixed subset of the polynomial’s coefficients and 2) P(ξ q )=η q , q=1,⋯,Q, Q>0 for given points (ξ q ,η q ), q=1,⋯,Q. The problem is reduced to a system of linear equations solved by the Gauss reduction technique
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