nonlin_newton_test, an Octave code which calls nonlin_newton(), which interactively applies Newton's method to seek a root of a function given formulas for f(x), f'(x), and a starting value a.
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nonlin_newton, an Octave code which interactively uses Newton's method to find the zero of a function, given formulas for f(x), f'(x), and a starting point.