手动获取的代码表达式调频(x1, x2, x3,…, xk)
等距的点(k + 1)维的,其中m f是近似的顺序。

例子:

x1 = [6 7 8 5 3 2 1 2 5 8];
x2 = [9 7 0 8 6 5 4 3 2 10];
y = [9 7 6 5 4 3 2 6 8 1];

mreg ((x1, x2), y, 1)
ans =
5.542073 -.2829251 * x2 + .2310048 * x1

mreg ((x1, x2), y, 2)
ans =
3.797949 -.6754073 * x2 -.2393447e-1 * x2 ^ 2
+ 2.256645 * x1 + .8248780e-1 * x1 * x2
-.2478672 * x1 ^ 2

mreg ((x1, x2), y, 3)
ans =
-24.62814 + 33.15517 * x2 - 9.837215 * x2 + .8316257 * x2 ^ 3 ^ 2
x1 + 7.450905 * -17.31119 * x1 * x2 -.6438069 * x1 * x2 ^ 2
+ .3614982 * x1 ^ 2 -.4148167 * x1 ^ 2 * x2 + .2851207 * x1 ^ 3

例子:

x1 = [6 7 8 5 4 3 2 1 2 5 8 5];
x2 = [9 10 7 0 8 6 5 4 3 2 5 7];
x3 = [5 6 7 8 9 7 6 5 4 3 5 3];
y = [9 7 6 5 4 3 2 6 8 1 8 0);

mreg ((x1, x2, x3), y, 2)
ans =
32.48905 - -7.049319 * x3 + .1384845 * x3 ^ 2 - 6.246954 * x2
x2 + 1.259510 * * x3 -.4498889e-1 * x2 ^ 2 + 5.668323 * x1
-.4038119 * x1 * x3 -.3257156 * x1 * x2 -.1031725 * x1 ^ 2