Oddity with fsolve, nSolve, etc.

[Michael de Estrada]

(01-11-2014 02:48 AM)Helge Gabert Wrote:  P.S. For example, for fsolve, just look up p. 393 of the HP Prime User Guide. You will see that intervals, returning multiple solutions, are clearly envisioned.

"With the optional third argument you can specify a guess for the solution or an interval within which it is expected that the solution will occur."

I don't see anything indicating multiple solutions, just a single solution occurring in a particular interval. The example shown just shows a single solution. Perhaps when you provide an interval that encompasses more than one valid solution, it gets confused. If you plot that function, you'll notice that it changes slope at x=0, which may confuse the solver. Also, the root at x=2 is unique, since the function does cross the ordinate axis. This is why Solve and Zeros do not list the root 2 twice.