Can matlab solve nonlinear problem with nonlinear constraints and 300 variables to decide? When I try to solve with fmincon following message is released. Solver stopped prematurely. fmincon stopped because it exceeded the function evaluation limit, options.MaxFunctionEvaluations = 3000 (the default value).

Although increase iteration number and MaxFunctionEvaluations but it shows same message as follows My guess would be that you created opts, but forgot to feed it to fmincon.

nonlinear problem with 300 varibales

Bjorn Gustavsson 2022-6-6

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Does fmincon return a different value than the initial guess? (that is does it even start moving?) You can always increase the number of steps and the other options to increase the defaults:

ops_fmnicon = optimset('fmincon')

and then set larger MaxFunctionEvaluations and other parameters, (smaller tolerances and step-lengths and whatnot). I've never run into other problems than time when looking for many parameters, also never ventured into the 100-s of them either, but there ought not to be no such limits

Ahmet Dogan 2022-6-6

编辑：Ahmet Dogan 2022-6-6

No, fmincon does not return a different value than the initial guess. I use following equations;

opts = optimset( 'MaxIter', 1000000, 'MaxFunEvals', 100000);

or

options = struct('MaxFunctionEvaluations', 100000);

Although increase iteration number and MaxFunctionEvaluations but it shows same message as follows;

Solver stopped prematurely.

fmincon stopped because it exceeded the function evaluation limit,

options.MaxFunctionEvaluations = 3000 (the default value).

Bjorn Gustavsson 2022-6-6

Does your starting-point have some peculiarities (in the gradient, jacobian etc), is it in a corner of the constraints? It is not a viable solution to your problem, but does fminsearch get rolling (check by setting the Display option to iter)? Sorry not to be more helpful, but there's not too much more to suggest with the information available.

Matt J 2022-6-6

编辑：Matt J 2022-6-6

We need to see code. It is not possible that fmincon did more than one iteration without moving at least slightly from the initial point.

Steven Lord 2022-6-6

Did you just create the options structure or did you pass it into fmincon as part of your call? Merely making the struct does not "change the global settings for fmincon" or anything like that. You have to tell fmincon to use those new options.

Matt J 2022-6-9

编辑：Matt J 2022-6-9

在 MATLAB Online 中打开

Ahmet Dogan's comment moved here

Thank you for your help. I added options and updated MaxFunctionEvaluations .

[x,fval] = fmincon(fun,x0,A,b,Aeq,beq,lb,ub,@confuneq,options);

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