下列是一个大体上用gpt写出的遗传算法但是出现了问题
位置 1 处的索引超出数组边界。
出错 wenti22>fun (第 67 行)
m(1,i)=zhongyao(1,i)*x(1,i);
出错 wenti22 (第 21 行)
individuals.fitness(i) = fun(k);
我仔细看过zhongyao和x都是1*402的矩阵
% 假设有402家原料生产厂商
num_suppliers = 402;
% 设置遗传算法参数
max_gen = 100; % 迭代次数
pop_size = 50; % 种群规模
pcross = 0.8; % 交叉概率
pmutation = 0.1; % 变异概率
zhongyao=zeros(1,402);
% 设置非线性规划参数
options = optimoptions('fmincon', 'Display', 'off');
% 初始化种群
individuals = struct('fitness', zeros(1, pop_size), 'chrom',[]);
for i = 1:pop_size
individuals.chrom(i, :) = rand(1,num_suppliers);% 假设每家厂商的订购量在0到1之间
k=individuals.chrom(i,:);
disp(k);
individuals.fitness(i) = fun(k);
end
% 进化过程
for i = 1:max_gen
% 选择操作
individuals = select(individuals, pop_size);
% 交叉操作
individuals.chrom = Cross(pcross, num_suppliers, individuals.chrom, pop_size);
% 变异操作
individuals.chrom = Mutation(pmutation, num_suppliers, individuals.chrom, pop_size);
% 计算适应度
for j = 1:pop_size
individuals.fitness(j) = fun(individuals.chrom(j, :));
end
end
% 非线性规划优化
best_fitness = min(individuals.fitness);
best_chrom = individuals.chrom(individuals.fitness == best_fitness, :);
best_chrom = best_chrom(1, :); % 如果有多个最优解,选择第一个作为初始点
% 定义非线性规划目标函数和约束函数
obj_func = @(x) -fun(x); % 非线性规划是求最小值,所以取相反数
nonlcon = @(x) constraint_func(x); % 约束函数
% 非线性规划求解
[opt_chrom, opt_fitness] = fmincon(obj_func, best_chrom, [], [], [], [], zeros(1, num_suppliers), ones(1, num_suppliers), nonlcon, options);
% 输出结果
disp('最优订购量:');
disp(opt_chrom);
disp('最优目标函数值:');
disp(-opt_fitness); % 非线性规划是求最小值,所以取相反数
% 目标函数
function y = fun(x)
% 这里根据实际问题定义目标函数,如原材料成本、供应商评估等
% 假设目标函数为原材料总成本,cishu是需求矩阵,cost是成本矩阵
k=sum(x,2);
global zhongyao;
for i=1:402
m(1,i)=zhongyao(1,i)*x(1,i);
disp('1');
end
h=sum(m,2);
y = k/h;
end
% 选择操作
function ret = select(individuals, pop_size)
individuals.fitness = 1 ./ individuals.fitness;
sumfitness = sum(individuals.fitness);
sumf = individuals.fitness ./ sumfitness;
index = [];
for i = 1:pop_size
pick = rand;
while pick == 0
pick = rand;
end
for j = 1:pop_size
pick = pick - sumf(j);
if pick < 0
index = [index j];
break;
end
end
end
individuals.chrom = individuals.chrom(index, :);
individuals.fitness = individuals.fitness(index);
ret = individuals;
end
% 交叉操作
function ret = Cross(pcross, num_suppliers, chrom, pop_size)
for i = 1:pop_size
pick = rand(1, 2);
while prod(pick) == 0
pick = rand(1, 2);
end
index = ceil(pick .* pop_size);
pick = rand;
while pick == 0
pick = rand;
end
if pick > pcross
continue;
end
pos = ceil(pick .* num_suppliers);
temp = chrom(index(1), pos:end);
chrom(index(1), pos:end) = chrom(index(2), pos:end);
chrom(index(2), pos:end) = temp;
end
ret = chrom;
end
% 变异操作
function ret = Mutation(pmutation, num_suppliers, chrom, pop_size)
for i = 1:pop_size
pick = rand;
while pick == 0
pick = rand;
end
index = ceil(pick .* pop_size);
pick = rand;
if pick > pmutation
continue;
end
pos = ceil(pick .* num_suppliers);
chrom(i, pos) = 1 - chrom(i, pos); % 变异:二进制位取反
end
ret = chrom;
end
% 约束函数
function [c, ceq] = constraint_func(x)
% 假设有约束条件,如总需求量不能超过供应量
% 这里根据实际问题定义约束函数
global cishu;
c = sum(cishu, 2) - x';
ceq = [];
end
https://blog.csdn.net/weixin_44209907/article/details/130804084
可以参考一下这个博客
代码发过来给你修改一下