exitflag=0 in fmincon accepted as accurate?

I use the interior-point algorithm in fmincon when doing the optimization. The exitflag corresponding to most of my outcome are 1 and 2 but I also got a few 0 as the exitflag. I know I should accept positive exitflag and reject negative exitflag, but how about 0? Can it be accepted as a stable convergence? Or should I tolerate on result which delivers 0?

Many thanks!

Answer 1

[Alan Weiss]

Take a look at what exitflag 0 means:

 Number of iterations exceeded options.MaxIter or number of function evaluations exceeded options.MaxFunEvals.

So as far as fmincon is concerned, it did not reach a solution, it just exceeded a limit on the number of iterations or function evaluations. I would not accept this as a solution.

Alan Weiss

MATLAB mathematical toolbox documentation

Answer 2

[Naresh Nandakumar]

Hi! I got a few exitflag = 0's. Does a value get generated and stored when this happens? Even if it isn't the exact answer? Thanks

[Walter Roberson]

Yes, you get the best result so far.