The Bounding Circle is the smallest enclosing circle to a given set of points on a plane https://en.wikipedia.org/wiki/Smallest-circle_problem
Find the radius r and center coordinates x, y of the smallest enclosing circle to the points with coordinates Xp, Yp (both [n x 1] vectors).
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I've implemented the Welzl's algorithm, but, please, be warned as I've learned later that sometimes the algorithm fails. Years later, Matoušek, Sharir, and Welzl seems to have fixed the problem, creating a new version of the algorithm (adding one additional test).
I think the tolerance in Test 3 is a bit too tight. My solution fails in about 28% of the cases because the numerical error max(D)-r is up to 8*eps.