Run Fminsearch in a loop

Question

Joe 2023-2-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1916945-run-fminsearch-in-a-loop

编辑： Joe 2023-2-23

采纳的回答： Steven Lord

在 MATLAB Online 中打开

Hello again,

I have a question regarding fminsearch and my code.

The idea is to run fminsearch in a loop. Therefore I wrote a costfunction with 3 optimization variables (A, B, C).

Inside the costfunction there is a variable 'U' that should vary from 30 to 50. Actually it is constant at 30 but it should vary for a range of values.

After all I want to save the results in a matfile.

Until now I started fminsearch from the console with fminsearch(@costfunction,[10;5;7] with the guess parameters for example 10,5,7

It would be great if someone can help me finding a solution for this!

Thanks in advance!

Here is the code :

function [cost_value] = costfunction(optimize) 
U = 30; % should run from from 30 to 50
A = optimize(1)			
B = optimize(2);
C = optimize(3);
H = [0;5;0];
.
.
.
Vect1 = [0; C; 0];
Vect2 = [0; 0; B; B; 0; A];
.
.	
cost_value=norm(out.simout)		
end
save results.mat U, A, B, C

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Answer 1

Steven Lord 2023-2-22

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1916945-run-fminsearch-in-a-loop#answer_1177470

Parameterize your costfunction. The "Minimize with Extra Parameters" example on the documentation page for the fminsearch function does this using an anonymous function and you can use a similar approach in your code. Instead of passing @costfunction into fminsearch pass @(v) costfunction(v, U) as the first input and modify costfunction so it accepts two inputs, optimize and U.