请教一个求极大似然值的问题，已知一变量服从近似正态分布，其均值为：(x(1)+x(5)*x(4))/(1-x(2)-x(3))，方差为：((x(6)/(1-x(7)-x(8)))-(2*((x(9)^2))*x(4)*(1-x(4))))*(1/(1-x(2)^2-x(3)^2))，其极大似然函数为：-(n/2)*log((2*pi)*deta)-((1/(2*deta))*sum((y-mu)'*(y-mu)))。其中约束有：x(2)^2+x(3)^2<1;x(7)^2+x(8)^2<1;x(4)>0,0<x(9)<0.由于存在非线性约束，所以求似然函数的极大值只能用fmincon函数。我尝试编程总是存在问题！请教各位高手吗，应该如何编程！附上自己编的小程序：
function x= example4_2a
load szzs
a = szzs(:);
y =100*(diff(log(a)));
n=length(y);
x0 = [0,0,0,1,1,1,0,0,0.5];
lb=[-inf,-inf,-inf,0,-inf,-inf,-inf,-inf,0];
ub=[inf,inf,inf,inf,inf,inf,inf,inf,1];
x = fmincon(@subfun,x0,[],[],[],[],lb,ub,[],@example4_2a1);
    function f = subfun(x)
        mu =(x(1)+x(5)*x(4))/(1-x(2)-x(3));
        m = sum((y-mu)'*(y-mu));
        deta =((x(6)/(1-x(7)-x(8)))-(2*((x(9)^2))*x(4)*(1-x(4))))*(1/(1-x(2)^2-x(3)^2));
        f = (n/2)*log((2*pi)*deta)+((1/(2*deta))*m);
    end
end
数据（szzs)是：3243.76000000000
3282.17900000000
3254.21500000000
3192.77600000000
3195.99700000000
3212.75000000000
3273.96600000000
3172.65800000000
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3151.85000000000
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3135
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2420
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