both real and integer variables ga optimization

2013 2 8
2 个回答
回答已采纳
3 次查看（30 天）

0 个投票

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

请先登录，再回答此问题。

 采纳的回答

0 个投票

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

4 个评论
显示 2更早的评论 隐藏 2更早的评论

andrea84
andrea84 2013-2-10
Hi Benji, you're right I meant that some of my variables should be discrete.
Anyway if the variable x1 has lb=0 and ub=100 how can i constrain it so that it assume only some numerical value ?
e.g [0,20,40,60,80,100]
andrea84
andrea84 2013-2-10
I also tried the example written in the link you provided but it failed, giving this error:
??? Error using ==> ga
Too many input arguments.
I'm using the R2011a version, is this the problem?
Walter Roberson
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
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].

请先登录，再进行评论。

更多回答（1 个）

Alan Weiss
Alan Weiss 2013-2-11

0 个投票

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

类别

在 帮助中心 和 File Exchange 中查找有关 Solver Outputs and Iterative Display 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by