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Sata
Posts:
36
Registered:
11/6/12


Re: Some parameters in GA
Posted:
Dec 3, 2012 9:59 AM


Hi Alan,
I appreciate your reply. However, after reading the documentations, I am still in doubt about those questions I asked. It would be good if you can try to explain each of my questions. I am sure, with your answers, I will be much clearer. TQ.
Alan_Weiss <aweiss@mathworks.com> wrote in message <k9i8gh$jpl$1@newscl01ah.mathworks.com>... > On 12/3/2012 6:09 AM, Sata wrote: > > 1) When I run the GA solver using the toolbox, is the objective > > function value the most critical output I have to monitor? When I run > > the GA repeatedly, do I have to record down other information for each > > run such as current iteration, reason for the optimization terminated > > and the final point? > > 2) Is there a standard reference of how many times we have to run for > > each set of parameter and then take the average of the objective > > function value? > > 3) For each run, the value for current iteration is different. How > > does this matter? Bigger value is better or smaller value is better. > > Is there an ideal value for current iteration? Do I have to do > > something to control the current iteration? > > 4) What is the meaning of this termination reason which was displayed > > at the results of toolbox ?Optimization terminated: average change in > > the fitness value less than options.TolFun.? > > 5) If I need to repeat the same set of parameter for ten times by > > using the toolbox, do I have to manually run it ten times and manually > > record the objective function value for each run? Is there another > > way which I can set to run ten times at once and record ten objective > > function values at once? > > 6) Will the stopping criteria for the number of generation affect my > > results? E.g does it matter if I set the number of generation to be > > 200, 300 or 400 etc. > > 7) In the constrain option, if I don?t have any constraints, do I just > > put [] for both linear equalities and linear inequalities? > > You would do well to read the documentation, then see if you are still > confused. Read the Concepts material in > http://www.mathworks.com/help/gads/geneticalgorithm.html > except for the Genetic Algorithm Options section. It won't take very > long, and should answer most or all of your questions. > > Alan Weiss > MATLAB mathematical toolbox documentation



