Small Solver Program

[Dieter]

(02-18-2019 05:20 AM)Thomas Klemm Wrote:  If you compare your algorithm with Newton's method:

\(x_{n+1}=x_{n}-\frac {f(x_{n})}{f'(x_{n})}\)

you may notice that the number in register 0 should in fact be \(f'(x_{n})\) or at least a good approximation thereof.

Yes. Gamo already posted this method some time ago in the General Software Library. I have mentioned several times that the first input it NOT a guess for the root but an estimate for the function's DERIVATIVE.

For more details take a look at this post: http://www.hpmuseum.org/forum/thread-123...#pid111680

Gamo, you really should correct and update the instructions. Here it still says:

Quote:Enter 2 guesses closest to the root.

But again: that's NOT true. The first input is NOT a guess for the root. You now have seen a variety of cases that prove it.

Dieter