请教 遗传算法求De Jong函数的最小值 问题
我按照书上的例子做的练习，结果运行有错误，不知道怎么去修改 ，请老师们帮忙看看，谢谢程序如下：
NIND=40; %个体数目
MAXGEN=300; %最大遗传代数
NVAR=20; %变量维数
PRECI=20; %变量的二进制位数
GGAP=0.9; %代沟
trace=zeros(MAXGEN,2); %寻优结果的初始值
FieldD=,);rep([-512;512],);rep(,)];
Chrom = crtbp(NIND, NVAR*PRECI); %初始种群
gen=0; %代计数器
ObjV = objfun1(bs2rv(Chrom,FieldD)); %计算初始种群个体的目标函数值
while gen<MAXGEN
FitnV = ranking(ObjV); %分配适应度值
SelCh = select('sus', Chrom, FitnV, GGAP); %选择
SelCh = recombin('xovsp', SelCh, 0.7); %重组
SelCh = mut(SelCh); %变异
ObjVSel=objfun1(bs2rv(SelCh,FieldD)); %计算子代的目标函数值
= reins(Chrom, SelCh, 1, 1, ObjV, ObjVSel); %重插入子代的新种群
gen=gen+1; %代计数器增加
%输出最优解及其对应的20个自变量的十进制值，Y为最优解，I为种群的序号
trace(gen,1)=min(ObjV); %遗传算法性能跟踪
trace(gen,2)=sum(ObjV)/length(ObjV);
end
plot(trace(:,1));hold on;
plot(trace(:,2),'-.');grid;
legend('解的变化','种群均值的变化');
程序运行后出现错误：
??? Error: File: G:\GA\遗传算法_matlab\gatbx\yichuan\OBJFUN1.M Line: 33 Column: 33
Illegal use of reserved keyword "switch".
Error in ==> test2 at 13
ObjV = objfun1(bs2rv(Chrom,FieldD)); %计算初始种群个体的目标函数值
objfun1程序是这样的：
function ObjVal = objfun1(Chrom,switch);
% Dimension of objective function
Dim = 20;
% Compute population parameters
= size(Chrom);
% Check size of Chrom and do the appropriate thing
% if Chrom is [], then define size of boundary-matrix and values
if Nind == 0
% return text of title for graphic output
if switch == 2
ObjVal = ['DE JONG function 1-' int2str(Dim)];
% return value of global minimum
elseif switch == 3
ObjVal = 0;
% define size of boundary-matrix and values
else
% lower and upper bound, identical for all n variables
ObjVal = 100*[-5.12; 5.12];
ObjVal = ObjVal(1:2,ones(Dim,1));
end
% if Dim variables, compute values of function
elseif Nvar == Dim
% function 1, sum of xi^2 for i = 1 : Dim (Dim=30)
% n = Dim, -5.12 <= xi <= 5.12
% global minimum at (xi)=(0) ; fmin=0
ObjVal = sum((Chrom .* Chrom)')';
% ObjVal = diag(Chrom * Chrom');% both lines produce the same
% otherwise error, wrong format of Chrom
else
error('size of matrix Chrom is not correct for function evaluation');
end
怎么回事呢？难道是工具箱中的objfun1有问题吗？请问哪位老师有正确的版本，可以给我一份吗？我的邮箱：huangliqin527@163.com
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