[Octave-bug-tracker] [bug #57141] fzero should warn when objective function produces complex value

[Rik]

URL:
  <https://savannah.gnu.org/bugs/?57141>

                 Summary: fzero should warn when objective function produces
complex value
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Tue 29 Oct 2019 02:50:23 PM PDT
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Other
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

Code to reproduce in Octave:


fzero (@(x) 0.5*x + 2*i*x - 5, [-20, 100])
error: fzero: not a valid initial bracketing
error: called from
    fzero at line 223 column 5


However, in Matlab, this example throws a warning that the function must be
finite and real at the endpoints.  This is a more relevant message.





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