用polyfit函数.如:x=[1,2,3,4,5];y=[23,43,56,89,122];a=polyfit(x,y,2)------------------------polyfit中的2表示二阶最小二乘法拟合得出系数a(1),a(2),a(3)则可以组成拟合方程a(1)x^2+a(2)x+a(3)=y具体matlab中输入:------------------------x=[1,2,3,4,5];y=[23,43,56,89,122];a=polyfit(x,y,2)x1=[0:0.1:6];y1=a(2)+a(1).*x1+a(2).*x1.^2;plot(x1,y1)hold onplot(x,y,'o')
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