www.pudn.com > GA.rar > DblGEGA.m, change:2008-09-10,size:2380b


function [xv,fv]=DblGEGA(fitness,a,b,NP,NG,Pc,Pm,eps) 
 
L = ceil(log2((b-a)/eps+1)); 
 
x = zeros(NP,L); 
 
for i=1:NP 
     
    x(i,:) = Initial(L); 
     
    fx(i) = fitness(Dec(a,b,x(i,:),L)); 
     
end 
 
for k=1:NG 
     
    sumfx = sum(fx); 
     
    Px = fx/sumfx; 
 
    PPx = 0; 
     
    PPx(1) = Px(1); 
     
    for i=2:NP 
         
        PPx(i) = PPx(i-1) + Px(i); 
         
    end 
 
    for i=1:NP 
         
        sita = rand(); 
         
        for n=1:NP 
             
            if sita <= PPx(n) 
                 
                SelFather = n; 
                 
                break; 
                 
            end 
             
        end 
         
        Selmother = round(rand()*(NP-1))+1; 
         
        posCut1 = round(rand()*(L-2)) + 1; 
         
        posCut2 = round(rand()*(L-2)) + 1; 
         
        while posCut2 == posCut1 
             
            posCut2 = round(rand()*(L-2)) + 1; 
             
        end 
         
        posCutmax = max(posCut1,posCut2); 
         
        posCutmin = min(posCut1,posCut2);         
         
        r1 = rand(); 
         
        if r1<=Pc 
             
            nx(i,1:posCutmin) = x(SelFather,1:posCutmin); 
             
            nx(i,(posCutmin+1):posCutmax) = x(Selmother,(posCutmin+1):posCutmax); 
             
            if posCutmax<L 
 
                nx(i,(posCutmax+1):L) = x(SelFather,(posCutmax+1):L); 
                 
            end 
            r2 = rand(); 
             
            if r2 <= Pm 
                 
                posMut = round(rand()*(L-1) + 1); 
                 
                nx(i,posMut) = ~nx(i,posMut); 
                 
            end 
             
        else 
             
            nx(i,:) = x(SelFather,:); 
             
        end 
         
    end 
 
    x = nx; 
     
    for i=1:NP 
         
        fx(i) = fitness(Dec(a,b,x(i,:),L)); 
         
    end 
     
end 
 
fv = -inf; 
 
for i=1:NP 
     
    fitx = fitness(Dec(a,b,x(i,:),L)); 
     
    if fitx > fv 
         
        fv = fitx; 
         
        xv = Dec(a,b,x(i,:),L); 
         
    end 
     
end 
 
function result = Initial(length) 
for i=1:length   
    r = rand(); 
    result(i) = round(r);    
end 
 
function y = Dec(a,b,x,L) 
base = 2.^((L-1):-1:0); 
y = dot(base,x); 
y = a + y*(b-a)/(2^L-1);