Example: confidence
Introduction - Lomont
FAST INVERSE SQUARE ROOT 3 3. The Algorithm The main idea is Newton approximation, and the magic constant is used to compute a good initial guess. Given a floating point value x > 0, we want to compute √1 x. Define f(y) = 1 y2 −x. Then the value we seek is the positive root of f(x). Newton’s root finding method,
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