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The logistic function is a function with domain and range the open interval, defined as: Equivalently, it can be written as: Yet another form that is sometimes used, because it makes some aspects of the symmetry more evident, is: For this page, we will denote the function by the letter.We may extend the logistic function to a function, where and.et another form that is sometimes used, because it makes some aspects of the symmetry more evident, is: For this page, we will denote the function by the letter. We may extend the logistic function to a function, where and.
Ablestock.com/AbleStock.com/Getty Images. A cost function is an economic function used in manufacturing to aid in making production line decisions. The cost function covers the cost of producing an item, taking into account both the fixed costs of the production as well as the variable cost per unit. To calculate a cost function then requires complete knowledge of the inputs into production for accuracy.