Equally Spaced Multipoint Method for Numerical Differentiation
The simplest numerical approximation of the derivative of a function at a point is given by the two-point formula: . Approximations involving more points can improve the accuracy of the derivative. Here the points are equally spaced.[more]
Use the controls "number of points ", "spacing " and "value of ". The popup menu selects the function to differentiate.
The first column gives the exact analytic derivative of the function. The second column shows the two-point approximation, while the third shows the derivative using an approximation of order .[less]
 Wikipedia. "Numerical Differentiation." (Jul 3, 2019) en.wikipedia.org/wiki/Numerical_differentiation.