Change fmincon from local to global search

Question

Benjamin 2021-3-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/769932-change-fmincon-from-local-to-global-search

评论： Benjamin 2021-3-11

采纳的回答： Benjamin

fmincon.zip

Hello

Dear all experts,

I have a code that uses fmincon to minimize a parameter (i.e. alpha), however, the program does not try different values for alpha, and show the initial adopted value as the output. I read in another topic that finding a global search, rather than a local minimum search could solve this problem. But I don't know how to change the fmincon to search for the global answers. I also used the approach here, but it doesn't work. I attached my code files, and I really appreciate it if you help me.

Thanks

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Jan 2021-3-11

fmioncon is a local optimizer. You cannot convert it to a global one, because this is a completely different approach. you cannot change your bike to act like a typing machine also.

I also used the approach here, but it doesn't work.

Then please post your code and explain, what "does not work" mean. We cannot guess this important detail. Using a global optimizer is the correct way, so lets solve the occurring problems.

Benjamin 2021-3-11

Thanks @Jan for your clarification.

Regards.

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Answer 1

Benjamin 2021-3-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/769932-change-fmincon-from-local-to-global-search#answer_645337

Re_evaluation.m

I changed the code to implement lsqcurvefit instead of fmincon and I was able to fix the problem. That means in my problem I did not need to search for a global search. Here I put the modified files just in case someone got into the same problem as me, and hopefully that helps.