specify the number of iterations in genetic algorithm matlab (ga)

dear all

I have a question related to the genetic algorithm (ga) in MATLAB I would like to specify the number of iterations so the algorithm stops after this number

I have only five variables

Answer 1

[Sam Chak]

Hi @mohammed hussein

Here is a simple example where you can vary MaxGene and check the accuracy of the result.

fun     = @objfcn;          % objective function, specified as a function handle
PopuSiz = 50;               % Population Size
MaxGene = 100;              % Max Generations
nvars   = 5;                % number of variables
A       = -eye(nvars);      % [];               % 
b       = zeros(nvars, 1);  % linear inequality constraints, A*x <= b
Aeq     = [];               
beq     = [];
lb      = [];               
ub      = [];               
nonlcon = [];
options = optimoptions('ga', 'PopulationSize', PopuSiz, 'MaxGenerations', MaxGene);
[x, fval, exitflag, output] = ga(fun, nvars, A, b, Aeq, beq, lb, ub, nonlcon, options)

Optimization terminated: maximum number of generations exceeded.

x = 1×5

1.0006 2.0004 3.0003 4.0006 5.0011

fval = 2.1865e-06

exitflag = 0

output = struct with fields:
      problemtype: 'linearconstraints'
         rngstate: [1×1 struct]
      generations: 100
        funccount: 4753
          message: 'Optimization terminated: maximum number of generations exceeded.'
    maxconstraint: 0
       hybridflag: []

function y = objfcn(x)

    y = (x(1) - 1).^2 + (x(2) - 2).^2 + (x(3) - 3).^2 + (x(4) - 4).^2 + (x(5) - 5).^2;

end

[mohammed hussein]

thank you very for your answer