ith something simple. It is a broad term, you can technically approximate apples with oranges. But since it's usually used by boring people, it usually concerns numbers, functions, points, and vector fields.
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The <span id="index_polynomial_approximation">polynomial approximation</span> is about composing a polynomial that could substitute another function or a set of points good enough. With a set of points, there is a nice matrix equation that does all the work for us. Here, try it out.
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