灰色线性回归

clc;                                                                  % 清屏
clear;                                                                % 清理内存
close all;                                                            % 关闭所有窗口
Y=[
   56.45
56.20
56.13
56.05
55.96
55.72
55.31
55.16
54.91
54.97
54.68
54.78
54.59
54.14
53.94
53.62
53.48
53.29
53.05
52.86
52.21
51.82
51.61
51.55
51.60
51.52
51.46
51.44
51.30
51.25
51.29
51.21
51.15
51.12
50.98
50.88
50.45
50.12
49.92
50.01
49.8
48.68
47.97
47.65
47.55
47.36
47.12
47.01
46.89
46.75
];
[ab]=size（Y）                                                   % 计算I的行列大小
for i=1:b                                                             % 求取原始数据的一次累加序列
    Y_1_AGO=cumsum（Y）;       %cumsum（a） 求数组的累加和
end
Q=Y_1_AGO                                                          % 累加序列，ok
[cd]=size（Q）;                     % 生成序列Y
% 求v的平均值
for i=1:c-2
    for j=1:a-2
        X（ij）=Q（j+b+11）-Q（j+b1）-Q（j+11）+Q（j1）;
    end
    b=b+1;
    a=a-1;
end
X
[ab]=size（Y）; 
for i=1:a-3
    for j=1:a-3
        V（ij）=log（abs（（X（ij+1）/X（i