Simply stated, successive univariate approximation first fits a set of univariate approximating functions, for example, polynomials, at each value of one of the independent variables. Interpolation, differentiation, or integration is then performed on each of these univariate approximating functions to yield values of the desired operation at thespecified value of the other independent variable.A univariate approximating function is then fit to those results as a function of the first independent variable.
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