matlab函数关系式,怎么用MATLAB建立数据间的函数关系

可以使用Matlab自带的sftool工具箱，来拟合。举例说明其求解方法：

在命令窗口下，输入

>> x=[565.454 562.058 561.39 563.782 567.941 571.255 571.938 569.5];

>> y=[528.012 525.544 521.447 518.108 517.407 519.857 523.953 527.356];

>> z=[1.792 1.818 1.783 1.769 1.772 1.77 1.794 1.794];

>> sftool

选择“Polynomia”l项，x的Degrees为1，y的Degrees为3

在Results窗口就会出现，你要的结果。

Linear model Poly13:

f(x,y) = p00 + p10*x + p01*y + p11*x*y + p02*y^2 + p12*x*y^2 + p03*y^3

where x is normalized by mean 566.7 and std 4.095

and where y is normalized by mean 522.7 and std 4.111

Coefficients (with 95% confidence bounds):

p00 =       1.792  (1.759, 1.826)

p10 =   -0.003984  (-0.03342, 0.02545)

p01 =     0.03654  (-0.02917, 0.1022)

p11 =   -0.004646  (-0.03621, 0.02692)

p02 =   -0.006507  (-0.03792, 0.0249)

p12 =  -0.0003025  (-0.04791, 0.04731)

p03 =    -0.01791  (-0.06526, 0.02944)

Goodness of fit:

SSE: 1.885e-005    剩余平方和

R-square: 0.9903

Adjusted R-square: 0.9318     相关系数

RMSE: 0.004342    剩余标准差