4楼: Originally posted by lijie169 at 2012-05-20 18:08:21
function f=fit(x,y)
f=lsqnonlin(@(a)fun(a,x,y),');
function f1=fun(a,x,y)
f1=y-(a(1)+a(2)*x+a(3)*x.^2+a(4)*x.^3).*exp(-a(2)*x);
end
end

x,y就是楼主输入的,a是一个矩阵，对应着abcd...

4楼: Originally posted by lijie169 at 2012-05-20 18:08:21
function f=fit(x,y)
f=lsqnonlin(@(a)fun(a,x,y),');
function f1=fun(a,x,y)
f1=y-(a(1)+a(2)*x+a(3)*x.^2+a(4)*x.^3).*exp(-a(2)*x);
end
end

x,y就是楼主输入的,a是一个矩阵，对应着abcd...