MATLAB: Optimization toolbox-quick question

Global Optimization Toolboxoptimization

Hello..

One question: How to use the optimization toolbox (ga) for a problem with 4 variables and three inequality constrains?

Thanks! B.

Best Answer

B - have you looked at the documentation found at ga? The first example discusses an optimization problem of two variables with three inequality constraints so I suspect that it can be extended to your problem of 4 variables and three inequality constraints.

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MATLAB: Quick itteration

The best thing to do would be to move the plotting outside the loop:

...
end
figure(1);
plot(xra,yra,'k.');

MATLAB: Quicker alternative to EVAL

Avoid the usage of eval when you need a fast program, and in all other cases also.

Instead of creating the strings 'theta(1).*theta(1)' it would be smarter to store the indices only:

A = {[1,1], [1,2], [1,3]; ...
     [2,1], [2,2], [2,3]; ...
     [3,1], [3,2], 3,3]};
for i = 1:n
  for j = 1:n
    index = A{i, j};
    a(i,j) = theta(index(1)) * theta(index(2));
  end
end

Using a numerical 3D array might be even faster.

Creating files dynamically has the big disadvantage, that reading and parsing the M-files is very time-consuming. Matlab is much more efficient, if you use static M-files and vary the parameters only.

Best Answer

Related Solutions

MATLAB: Quick itteration

MATLAB: Quicker alternative to EVAL

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