function Population = EnvironmentalSelection(Population,N,kappa)
% The environmental selection of IBEA

%------------------------------- Copyright --------------------------------
% Copyright (c) 2023 BIMK Group. You are free to use the PlatEMO for
% research purposes. All publications which use this platform or any code
% in the platform should acknowledge the use of "PlatEMO" and reference "Ye
% Tian, Ran Cheng, Xingyi Zhang, and Yaochu Jin, PlatEMO: A MATLAB platform
% for evolutionary multi-objective optimization [educational forum], IEEE
% Computational Intelligence Magazine, 2017, 12(4): 73-87".
%--------------------------------------------------------------------------

    Next = 1 : length(Population);
    [Fitness,I,C] = CalFitness(Population.objs,kappa);
    while length(Next) > N
        [~,x]   = min(Fitness(Next));
        Fitness = Fitness + exp(-I(Next(x),:)/C(Next(x))/kappa);
        Next(x) = [];
    end
    Population = Population(Next);
end