Selection function in genetic algorithm

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Parikshit Sharma
Parikshit Sharma 2018-5-9
编辑： Stephan 2018-5-11
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?

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回答（1 个）

Stephan
Stephan 2018-5-10
编辑：Stephan 2018-5-10
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
  2 个评论
Parikshit Sharma
Parikshit Sharma 2018-5-11
Thank you for your reply Stephan can you please tell me what is the default tournament size for selection function?
Stephan
Stephan 2018-5-11
编辑：Stephan 2018-5-11
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

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