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Set and Change Options

The recommended way to set options is to use the optimoptions function. For example, the following code sets the fmincon algorithm to sqp, specifies iterative display, and sets a small value for the ConstraintTolerance tolerance.

options = optimoptions('fmincon',...
    'Algorithm','sqp','Display','iter','ConstraintTolerance',1e-12);

Note

Use optimset instead of optimoptions for the fminbnd, fminsearch, fzero, and lsqnonneg solvers. These are the solvers that do not require an Optimization Toolbox™ license.

You can change options in several ways. For example, you can use dot notation.

options.StepTolerance = 1e-10;

Or, you can change options using optimoptions.

options = optimoptions(options,'StepTolerance',1e-10);

Note

Ensure that you pass options in your solver call, as shown in this example.

[x,fval] = fmincon(@objfun,x0,[],[],[],[],lb,ub,@nonlcon,options);

To reset an option to its default value, use resetoptions.

options = resetoptions(options,'StepTolerance');

Reset more than one option at a time by passing a cell array of option names.

options = resetoptions(options,{'Algorithm','StepTolerance'});

You can also set and change options using the Optimize Live Editor task.

See Also

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