[Octave-bug-tracker] [bug #64878] fminbnd missing a check for bounds a and b

[Liang Tang]

URL:
  <https://savannah.gnu.org/bugs/?64878>

                 Summary: fminbnd missing a check for bounds a and b
                   Group: GNU Octave
               Submitter: lt1234
               Submitted: Thu 09 Nov 2023 07:39:22 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
             Assigned to: None
         Originator Name: lt1234
        Originator Email: 
             Open/Closed: Open
                 Release: 8.2.0
         Discussion Lock: Any
        Operating System: Microsoft Windows
           Fixed Release: None
         Planned Release: None


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Follow-up Comments:


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Date: Thu 09 Nov 2023 07:39:22 PM UTC By: Liang Tang <lt1234>
fminbnd documentation specifies the requirements for bounds:  The endpoints
must be finite.

The 8.2.0 code itself does not check for if the end points are finite.  Please
see the example error state when illegal bound specifications are not
rejected.  A "isfinite" check may be inserted to detect the input errors. 
Thanks. 

func=@(x) x.^2;
function stop=func_out(x, optv, state), stop=0; display(x); end 
options=optimset('fminbnd'); options.OutputFcn=@func_out; 
[k, fval, exitflag, output] = fminbnd (func, -100, 100, options)  
[k, fval, exitflag, output] = fminbnd (func, [], [], options)
[k, fval, exitflag, output] = fminbnd (func, -inf, inf, options)  
  












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