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The normalized rational fraction ranks first to fit data. There are some exception to this rule. The Mathcad/Mathsoft is easy to use as it requires no guess values. It is powered from its built-in "genfit" Levenberg-Marquardt. Smath does not have a "genfit equivalent". Thus, for the rational fit we are confined to play lottery for initialising the rational fraction. This example works fine after winning the "lottery". Jean Genfit Rational Type J.sm (42kb) downloaded 28 time(s).
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