www.pudn.com > GA.rar > NormFitGA.m, change:2008-09-13,size:2070b

```function [xv,fv]=NormFitGA(fitness,a,b,NP,NG,ksi0,c,Pc,Pm,eps)
%动态线性标定适值函数
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

ksi = ksi0;

for k=1:NG

fmin = min(fx);

Normfx = fx - fmin*ones(size(fx)) + ksi;

sumfx = sum(Normfx);

Px = Normfx/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;

posCut = round(rand()*(L-2)) + 1;

r1 = rand();

if r1<=Pc

nx(i,1:posCut) = x(SelFather,1:posCut);

nx(i,(posCut+1):L) = x(Selmother,(posCut+1):L);

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

ksi = ksi*c;

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);

```