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

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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.

Accepted Answer

Alan Weiss
Alan Weiss on 30 Dec 2016
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

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