How can i optimize a symbolic function?

Question

Natanael Acencio Rijo 2013-12-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/108859-how-can-i-optimize-a-symbolic-function

回答： Andrei Bobrov 2013-12-6

I got a function which gives this final result:

   5.3*p(1) + 5.5*p(2) + 5.8*p(3) + 0.004*p(1)^2 + 0.006*p(2)^2 + 0.009*p(3)^2 + 1100.0

I want to find the minimum of this function using GA in the optimization toolbox. The problem here is that the function is in sym class, and when i try to convert to double the variables are not converted.

Note: i must not assign values to p before optimizing,this is to be done by the optimization algorithm.

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Answer 1

Andrei Bobrov 2013-12-6

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https://ww2.mathworks.cn/matlabcentral/answers/108859-how-can-i-optimize-a-symbolic-function#answer_117483

在 MATLAB Online 中打开

Please try this is code:

z = ...
subs(5.3*p(1) + 5.5*p(2) + 5.8*p(3) +...
 0.004*p(1)^2 + 0.006*p(2)^2 + 0.009*p(3)^2 + 1100.0,p,sym('p_',[numel(p),1]));
fun = matlabFunction(z,'vars',{symvar(z)});