matlab二元函数拟合

1.不要想着什么都直接问别人要程序
2.matlab里有一个非线性拟合函数lsqcurvefit，我给你个范例，照着写就行了

x=0.019,0.023,0.027
y=430,380,256
3 parameters: a,b,c
target function: y=(a*(1-x/b)+x/b)^c

================================================

function Untitled3

clc

xi=[0.019,0.023,0.027];
yi=[430,380,256];
abc0=[4,0.5,5];
abc = lsqcurvefit(@fun,abc0,xi,yi)

function y = fun(abc,x)
y = (abc(1)*(1-x/abc(2))+x/abc(2)).^abc(3);

abc =

31.2588 -3.9585 1.7033

============================================
3.采用什么函数形式拟合要看你有没有合适的理论模型，如果没有模型的话，用多项式拟合最方便，matlab有函数polyfit，但我不知道能不能拟合二元函数，自己看下帮助

1.不要想着什么都直接问别人要程序
2.matlab里有一个非线性拟合函数lsqcurvefit，我给你个范例，照着写就行了
x=0.019,0.023,0.027
y=430,380,256
3 parameters: a,b,c
target function: y=(a*(1-x/b)+x/b)^c
================================================
function Untitled3
clc
xi=[0.019,0.023,0.027];
yi=[430,380,256];
abc0=[4,0.5,5];
abc = lsqcurvefit(@fun,abc0,xi,yi)
function y = fun(abc,x)
y = (abc(1)*(1-x/abc(2))+x/abc(2)).^abc(3);
abc =
31.2588 -3.9585 1.7033
============================================
3.采用什么函数形式拟合要看你有没有合适的理论模型，如果没有模型的话，用多项式拟合最方便，matlab有函数polyfit，但我不知道能不能拟合二元函数，自己看下帮助