HP calcs are really not that accurate..

[AlexFekken]

(12-04-2017 02:16 AM)Thomas Okken Wrote:  Newton's method not guaranteed to converge? That's news to me. Could you elaborate?

As I remember it, it is only garanteed to converge when you start "close enough" (and the function smooth enough of course) because the function that you iterate is a (local) contraction with the zero as its fixed point.

Global convergence is not garanteed unless you have additional (global) constraints. Will see if I can find an example.

EDIT: https://en.wikipedia.org/wiki/Newton%27s...e_analysis