MATLAB doesn't recognize the function optimoptions

I'm getting an error at the following line:

options = optimoptions('ga','PopulationSize',10,'MaxGenerations',10);

The following message exemplifies the problem.

I'm using the version 9.10 (R2021a) of MATLAB and the version 4.5 (R2021a) of the Global Optimization Toolbox

The photo is just an exemple, I must say that the version written in lowercase also doesn't work

Any suggestions will be appreciated

Answer 1

[Star Strider]

MATLAB is case-sensitive.

Try this —

options = optimoptions('ga')

optionbs = 
  ga options:

   Set properties:
     No options set.

   Default properties:
             ConstraintTolerance: 1.0000e-03
                     CreationFcn: []
                    CrossoverFcn: []
               CrossoverFraction: 0.8000
                         Display: 'final'
                      EliteCount: '0.05*PopulationSize'
                    FitnessLimit: -Inf
               FitnessScalingFcn: @fitscalingrank
               FunctionTolerance: 1.0000e-06
                       HybridFcn: []
         InitialPopulationMatrix: []
          InitialPopulationRange: []
             InitialScoresMatrix: []
                  MaxGenerations: '100*numberOfVariables'
             MaxStallGenerations: 50
                    MaxStallTime: Inf
                         MaxTime: Inf
                     MutationFcn: []
    NonlinearConstraintAlgorithm: 'auglag'
                       OutputFcn: []
                         PlotFcn: []
                  PopulationSize: '50 when numberOfVariables <= 5, else 200'
                  PopulationType: 'doubleVector'
                    SelectionFcn: []
                     UseParallel: 0
                   UseVectorized: 0

.

.

[Julio]

Thanks for your response, but it still doesn't work

[Star Strider]

My pleasure!

Check the documentation for your MATLAB release (R2021a). The currently available online documentation is for R2024b. I am not certain which one you are using as a reference, and while both have worked over the years, there have also been changes over the years when the character vector ('ga') has worked and the other (@ga) has not, and the reverse.

The other possibility is to use the function handle in your optimoptions call, for example —

options = optimoptions(@ga)

options = 
  ga options:

   Set properties:
     No options set.

   Default properties:
             ConstraintTolerance: 1.0000e-03
                     CreationFcn: []
                    CrossoverFcn: []
               CrossoverFraction: 0.8000
                         Display: 'final'
                      EliteCount: '0.05*PopulationSize'
                    FitnessLimit: -Inf
               FitnessScalingFcn: @fitscalingrank
               FunctionTolerance: 1.0000e-06
                       HybridFcn: []
         InitialPopulationMatrix: []
          InitialPopulationRange: []
             InitialScoresMatrix: []
                  MaxGenerations: '100*numberOfVariables'
             MaxStallGenerations: 50
                    MaxStallTime: Inf
                         MaxTime: Inf
                     MutationFcn: []
    NonlinearConstraintAlgorithm: 'auglag'
                       OutputFcn: []
                         PlotFcn: []
                  PopulationSize: '50 when numberOfVariables <= 5, else 200'
                  PopulationType: 'doubleVector'
                    SelectionFcn: []
                     UseParallel: 0
                   UseVectorized: 0

Both work in R2024b.

.

[Walter Roberson]

What is the error message when using optimoptions('ga') ?

[Walter Roberson]

If the message is about unrecognized solver, then the problem is that the Global Optimization Toolbox is not installed.

[Julio]

Walter, the error message that I receive is the same shown at the photo, Unrecognized function or variable 'optimoptions'.

[Star Strider]

Do you have the Optimization Toolbox and the Global Optimizaztion Toolbox licensed and installed?

If you do (since it is still not working) run these from your Command Window or a scriptt:

restoredefaultpath

rehash toolboxcache

and try it again. If it is still not working after that, Contact Support.

.

[Walter Roberson]

If the message is about optimoptions not being recognized, then you do not have the Optimization Toolbox installed, and certainly not the Global Optimization Toolbox.

Answer 2

[Walter Roberson]

If really necessary you could use the older gaoptimset (which has not been recommended since R2018b)