我有 joy clayton 的程序，你要不

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安装Patton_copula_toolbox
Clayton's copula：
lower = 0.0001;
theta0 = 1;
[ kappa2 LL2] = fmincon('claytonCL',theta0,[],[],[],[],lower,[],[],options,[u,v]);

Rotated Clayton copula (with tail dep in upper tail instead of lower)：
lower = 0.0001;
theta0 = 1;
[ kappa3 LL3] = fmincon('claytonCL',theta0,[],[],[],[],lower,[],[],options,1-[u,v]);