Run Fminsearch in a loop

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

Answer 1

[Steven Lord]

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.

[Joe]

Thanks a lot!

[Joe]

I have an other question, can you please specifiy what "v" is in your description?

"Instead of passing @costfunction into fminsearch pass @(v) costfunction(v, U) as the first input "