initialization.m

%  Grey Wold Optimizer (GWO) source codes version 1.1               %
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%  Developed in MATLAB R2011b(7.13)                                 %
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%  Author and programmer: Seyedali Mirjalili                        %
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%         e-Mail: ali.mirjalili@gmail.com                           %
%                 seyedali.mirjalili@griffithuni.edu.au             %
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%       Homepage: http://www.alimirjalili.com/GWO.html              %
%                                                                   %
%   Main paper: S. Mirjalili, S. M. Mirjalili, A. Lewis             %
%               Grey Wolf Optimizer, Advances in Engineering        %
%               Software, Volume 69, March 2014, Pages 46-61,       %
%               http://dx.doi.org/10.1016/j.advengsoft.2013.12.007  %
%                                                                   %

% This function initialize the first population of search agents
function Positions=initialization(SearchAgents_no,dim,ub,lb)

Boundary_no= size(ub,2); % numnber of boundaries

% If the boundaries of all variables are equal and user enter a signle
% number for both ub and lb
if Boundary_no==1
    Positions=rand(SearchAgents_no,dim).*(ub-lb)+lb;
end

% If each variable has a different lb and ub
if Boundary_no>1
    for i=1:dim
        ub_i=ub(i);
        lb_i=lb(i);
        Positions(:,i)=rand(SearchAgents_no,1).*(ub_i-lb_i)+lb_i;
    end
end