both real and integer variables ga optimization

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andrea84 2013-2-8

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采纳的回答： Shashank Prasanna

How can i perform an optimization with the gamultiobj function using both real and integer variables ?

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Answer 1

Shashank Prasanna 2013-2-8

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Andrea, integers are real, however I think you are referring to solving a mixed integer problem. Here is an example of how it can be done using GA:

http://www.mathworks.com/help/gads/mixed-integer-optimization.html

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Walter Roberson 2013-2-10

R2011a did not support constraining to integer.

I don't think you can (even with R2012b) constrain to arbitrary sets of values. However, you can (in versions that support it) constrain to integer values, with a range of 1 to the number of different values, and then in the function you provide, use that variable as an index into the table of actual values.

andrea84 2013-2-10

Thanks for the explanation!

I'm thinking to use a function to "map" the values obtained from the ga, e.g. [1 2 3 4 5] to the range i need: [20 40 60 80 100].

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Answer 2

Alan Weiss 2013-2-11

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As Benji said, you cannot perform mixed integer optimization automatically in GA unless you have MATLAB R2011b or later. However, you can write custom population functions for this purpose; see this explanation. You might also want to see this example on mapping integer variables to a finite set of choices.

Good luck,

Alan Weiss

MATLAB mathematical toolbox documentation