 The objective consists of adjusting the parameters of a model function to best fit a data set.A simple data set consists of "n" points (data pairs) formula_1, "i" = 1, ..., "n", where formula_2 is an independent variable and formula_3 is a dependent variable whose value is found by observation.The model function has the form formula_4, where "m" adjustable parameters are held in the vector formula_5.