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Interpolation is the process of estimating the values of a function, when the function's values are known only at a particular set of points. Questions on interpolation in one or more dimensions, as well as algorithms for doing so, should have this tag.
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Example of a continuous function that is difficult to approximate with polynomials
I thought about concocting something "noisy", but instead of rolling my own I am just wondering whether there is a kind of standard "difficult function" that people use for testing approximation / interpolation …