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clc;clear all;close all;
% 构造超平面数据
% 系数定义
a1 = 5;
a2 = 10;
a3 = 50;
% 记录线性回归的数据表
data_table = zeros(100*100,4);
k = 0;
for i = 1:1:100
for j = 1:1:100
% 超平面绘图 加上噪声
z(i,j) = a1*i + a2*j + a3 + (100 * rand() - 50);
% 训练数据
k = k + 1;
data_table(k,1) = i;
data_table(k,2) = j;
data_table(k,3) = 1;
data_table(k,4) = z(i,j);
end
end
surf(z);
% 利用最小二乘法进行线性拟合回归
mat = data_table(:,1:3);
Y = data_table(:,4);
mat_T_mat = mat' * mat ;
mat_T_Y = mat' * Y;
co_arr = mat_T_mat \ mat_T_Y