problem with ga function variable bounds

[George Kousiouris]

Hi,

I am using ga package version 0.9.4. I am trying to launch the genetic 
algorithm with lower and upper bounds for the variables but this does 
not seem to work. It seems that the values are inside the interval 
[0,1]. So I took the values from this interval and normalized them in 
order to fall inside the intervals I wanted. But while it was working 
well for 30-40 generations, then values over 1 or negative appeared. 
Does anyone have any idea why this is happening? I also tried 
PopInitRange which again worked for a while and then it gave values 
outside the interval. I guess this option may refer only to the initial 
population range.

Snippet from my code:

% Fitness function
fitnessFunction = @script2;
% Number of Variables
nvars = 19;

% Linear inequality constraints
Aineq = [];
Bineq = [];
% Linear equality constraints
Aeq = [];
Beq = [];
% Bounds
lb = [3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1];
ub = [10 13 13 13 13 13 13 13 13 13 13 8 8 8 8 8 8 8 8];
% Nonlinear constraints
nonlconFunction = [];

%options = gaoptimset;
% Modify some parameters

options = gaoptimset('Generations' ,3,'PopulationSize',20);
%NORMALIZATION GIA TA YPOLOIPA DIASTHMATA


%options = gaoptimset(options,'StallTimeLimit' ,Inf);
%options = gaoptimset(options,'Display' ,'off');
% Run GA

[X,FVAL,REASON,OUTPUT,POPULATION,SCORES] = 
ga(fitnessFunction,nvars,Aineq,Bineq,Aeq,Beq,lb,ub,nonlconFunction,options)