how to use variables in fitness function in the genetic algorithm optimization?

2 次查看（过去 30 天）

显示更早的评论

Ekin Ceyda Cetin 2016-12-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/318600-how-to-use-variables-in-fitness-function-in-the-genetic-algorithm-optimization

评论： Ekin Ceyda Cetin 2017-1-4

采纳的回答： Alan Weiss

i try to run genetic algorithm optimization using a fitness function that includes variables and i get this error.

--The following error occurred converting from sym to double:

DOUBLE cannot convert the input expression into a double array.

If the input expression contains a symbolic variable, use VPA.--

i used syms when i calculate the fitness function.

anyone has any ideas about this problem? thank you.

采纳的回答

Alan Weiss 2016-12-30

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/318600-how-to-use-variables-in-fitness-function-in-the-genetic-algorithm-optimization#answer_248980

Global Optimization Toolbox function expect variables of type double, not symbolic. To use symbolic variables, first convert them to double type. For an efficient way to do this, see this example.

Alan Weiss

MATLAB mathematical toolbox documentation

Does the function involve multiple variables? If it does then when you call matlabFunction then provide the 'vars' option as a column vector of variable names instead of using the more common row vector of variable names.

Ekin Ceyda Cetin 2017-1-4