Mark Dickinson added the comment: > - finally, compare the epsilons abs(y**n - x) for the initial guess > and improved version, returning whichever gives the smaller epsilon. > > So I'm confident that nth_root() should never be worse than pow().
Same deal here: those aren't the actual errors; they're approximations to the errors, since the computations of the epsilons depends on (a) the usual floating-point rounding, and more significantly (b) the accuracy of the `y**n` computation. It's entirely possible that the value giving the smaller epsilon is actually the worse of the two approximations. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue27761> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
