MATLAB如何进行多元非线性拟合? x=[1,4,2,3,6,9,4,9] y=[2,5,7,3...答:由最小二乘法求得,二元非线性函数。z=-0.7055*x^2-0.2840*x*y+0.5205*y^2+6.9613*x-1.3290*y+6.0030 拟合精度为 R^2 = 0.9792
Matlab 二元非线性函数拟合 函数形式已知 求取系数。求帮助。答:非线性曲线拟合:lsqcurvefit x=lsqcurvefit(fun, x0,xdata,ydata)[x,resnorm]=lsqcurvefit(fun, x0,xdata,ydata)功能:根据给定的数据xdata,ydata(对应点的横,纵坐标),按函数文件fun给定的函数,以x0为初值作最小二乘拟合,返回函数fun中的系数向量x和残差的平方和resnorm.
matlab二元函数拟合答: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...