How to apply a random Crossover (Arithmeti​c/Scattere​d/Two-poin​t) in Genetic Algorithm using auto-generated file from Optimization Toolbox ?

2020 8 10
2 个回答
回答已采纳
更新时间：2021 1 25
9 次查看（30 天）

0 个投票

I have prepared a code in MATLAB with optimization toolbox which seems to be giving fair results for different optimization functions but at present, accuracy is highly dependent on the type of crossover selected.
To take advantage of different crossover and to improve efficiency, i want to apply a random crossover after every iteration i.e. any of Arithmetic, Scattered or Two-point. How can I do that ?

7 个评论
显示 5更早的评论 隐藏 5更早的评论

Walter Roberson
Walter Roberson 2020-8-10
Do you have integer constraints? Do you have linear constraints?
If your system is eligible to provide CrossoverFcn, then that function is not required to do the same kind of cross-over each time.
Ankur Shah
Ankur Shah 2020-8-10
编辑：Ankur Shah 2020-8-10
GA+fmincon is used and system has only lower and upper bounds.. I am trying to verify Schwefel and griewank benchmark.. both are unconstrained but am trying to verify with fmincon using lower and upper bounds.. since later i will be working on same algorithm.. keeping all parameters constant , With schwefel global minimum is obtained using scattered crossover and for griewank global minimum is obtained using Arithmetic crossover.. hence the confusion..
Walter Roberson
Walter Roberson 2020-8-10
Then you can provide a custom CrossoverFcn that does whatever you want, possibly even calling a random one of the standard crossover functions.
Ankur Shah
Ankur Shah 2020-8-11
编辑：Ankur Shah 2020-8-11
That is exactly what i am trying to do i.e. How to call a random crossover for each iteration ?
Walter Roberson
Walter Roberson 2020-8-11
crossfcns = {@first, @second};
chosen = crossfcns{randi(length(crossfcns))} ;
[varargout{:}] = chosen<varargin{:}) ;
Ankur Shah
Ankur Shah 2020-8-11
编辑：Ankur Shah 2020-8-11
Can u please explain where can it be applied ?.. At present I have prepared crossover code using optimization toolbox as follows
options = optimoptions(options,'CrossoverFcn', @crossoverscattered)
Walter Roberson
Walter Roberson 2020-8-11
options = optimoptions(options,'CrossoverFcn', @MyCustomCrossover)
function varargout = MyCustomCrossover(varargin)
crossfcns = {@crossoverarithmetic, @crossoverheuristic, @crossoveritnermediate, @crossoverscattered, @crossoversinglepoint, @crossovertwopoint};
chosen = crossfcns{randi(length(crossfcns))} ;
[varargout{:}] = chosen(varargin{:}) ;
end

请先登录，再进行评论。

请先登录，再回答此问题。

 采纳的回答

Walter Roberson
Walter Roberson 2021-1-25

0 个投票

options = optimoptions(options,'CrossoverFcn', @MyCustomCrossover)
function varargout = MyCustomCrossover(varargin)
crossfcns = {@crossoverarithmetic, @crossoverheuristic, @crossoveritnermediate, @crossoverscattered, @crossoversinglepoint, @crossovertwopoint};
chosen = crossfcns{randi(length(crossfcns))} ;
[varargout{:}] = chosen(varargin{:}) ;
end

更多回答（1 个）

0 个投票

See the screen shot given in the attachement. You should select from the drop-down options whichever crossover function suits for your task.

3 个评论
显示 1更早的评论 隐藏 1更早的评论

Ankur Shah
Ankur Shah 2020-8-11
编辑：Ankur Shah 2020-8-11
I am trying to use it in code and not in GA Optimisation toolbox. Also random crossover to be done after each iteration.
Ankur Shah
Ankur Shah 2021-1-25
编辑：Ankur Shah 2021-1-25
Hi, Yes the code worked perfectly. I was trying to to tag your answer as Accepted but couldn't do. Apologies for confusion... Could you have a look at this question https://in.mathworks.com/matlabcentral/answers/725727-how-to-find-function-and-variable-value-at-each-iteration-for-genetic-algorithm-with-parallel-comput?s_tid=prof_contriblnk

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Genetic Algorithm 的更多信息

产品

标签

Community Treasure Hunt

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

Start Hunting!

Translated by