MATLAB: Hi, I tried to use fmincon but I received the message. How to overcome this problem

fmincon

" fmincon stopped because the size of the current step is less than the default value of the step size tolerance but constraints are not satisfied to within the default value of the constraint tolerance "

Best Answer

See http://uk.mathworks.com/matlabcentral/answers/217997-i-trying-to-solve-the-optimization-problem-i-faced-three-kinds-of-error-does-any-one-know-how-ca

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MATLAB: Fitness function increases rather than decreasing with fmincon using hybrid Genetic Algorithm

This might happen if your objective has discontinuities or non-differentiabilities. Such functions are outside the scope of fmincon.

MATLAB: How to change the step tolerance or constraint tolerance in fmincon

Hi,

The answer to why this occurs is explained in the following link 3rd part

https://www.mathworks.com/matlabcentral/answers/218418-hi-i-tried-to-use-fmincon-but-i-received-the-message-how-i-can-overcome-this-problem

You can use the optimoptions function to change the tolerance values like

options = optimset('fmincon','StepTolerance',1e-10);
fmincon(....., options);

Hope this helps!

Best Answer

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MATLAB: Fitness function increases rather than decreasing with fmincon using hybrid Genetic Algorithm

MATLAB: How to change the step tolerance or constraint tolerance in fmincon

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