[Octave-bug-tracker] [bug #46808] Convergence problems????

[Kai Torben Ohlhus]

Update of bug #46808 (project octave):

                Severity:              3 - Normal => 2 - Minor              
              Item Group:                    None => Incorrect Result       
                  Status:                    None => Invalid                
             Assigned to:                    None => siko1056               
             Open/Closed:                    Open => Closed                 
        Operating System:       Microsoft Windows => Any                    

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Follow-up Comment #1:

According to the documentation

https://www.gnu.org/software/octave/doc/interpreter/Solvers.html#XREFfzero

"x0 should be a two-element vector specifying two points which bracket a
zero."

"If x0 is a single scalar then several nearby and distant values are probed in
an attempt to obtain a valid bracketing. If this is not successful, the
function fails."

For you the second quote failed. Maybe MATLAB implements a smarter guessing
bracketing strategy. If you try the first quote to your example:


fzero(f, [pi/2, 3*pi/2])
ans =  3.50262524454451


you get the very same result.

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