近似模型中的响应面法的三次多项式拟合

d20060928

ISight近似模型中的rsm的二次三次四次项。拟合出的结果meow交叉项吗？看了Isight的user's guide上解释说：
Cubic.
If this option is selected, the model polynomial will have all quadratic
terms and only pure cubic terms (i.e.,no mixed interaction terms of third order
are included).
这个咋个理解哦？比如说inputs有x1,x2.output有F。选择三次rsm的话是不是拟合出来的结果就是：
F=c0+c1*x1^3+c2*x2^3+c3*x1^2+c4*x2^2    还是    F=c0+c1*x1^3+c2*x2^3+c3*x1^2+c4*x2^2+c5*x1*x2+c6*x1^2*x2+c7*x1*x2^2+c8*x1+c9*x2
貌似读中文资料三次拟合结果是 F=c0+c1*x1^3+c2*x2^3+c3*x1^2+c4*x2^2+c5*x1*x2+c6*x1^2*x2+c7*x1*x2^2+c8*x1+c9*x2。。
Cubic.
If this option is selected, the model polynomial will have all quadratic
terms and only pure cubic terms (i.e.,no mixed interaction terms of third order
are included).又咋个解释哦？？

533秋

是有交叉项的。