convergence, a Python code which is given a sequence of approximation errors and estimates the order of convergence, assuming the results correspond to a a sequence of decreasing mesh sizes h, or increasing mesh counts n.
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convergence is available in a FreeFem++ version and a MATLAB version and an Octave version and a Python version.
differ, a Python code which is given function values at equally spaced locations, and the order of a derivative, and uses the finite difference method (FDM) to compute a linear combination of these function values which approximates that derivative.