Selection function in genetic algorithm

When i specify integer constraint in genetic algorithm a warning which says:

Warning: Problem has integer constraints. The following options will be ignored by GA:

SelectionFcn

so my question is, what selection operator genetic algorithm uses when we specify constraint to be integer constraint?

Answer 1

[Stephan]

Hi,

the SelectionFcn ga uses, will be the binary tournament selection function. All other settings are being overrided when you include integer constraints.

See here for further information:

https://de.mathworks.com/help/gads/mixed-integer-optimization.html

Best regards

Stephan

[Parikshit Sharma]

Thank you for your reply Stephan can you please tell me what is the default tournament size for selection function?

[Stephan]

Hi,

standard is a tournament size of 4. But in your case the Tournament Size is 2, due to the use of the penalty function used by ga when working with integer constraints:

.

.

which is described below:

.

.

For further Information see link in my answer above and here:

https://de.mathworks.com/help/gads/genetic-algorithm-options.html

.

Best regards

Stephan