How to calculate numerical Hessian for a multivariate Gaussian likelihood with non-linear constraints on the covariance matrix?

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V B
V B on 24 Apr 2015
I'm trying to calculate standard errors for coefficient estimates in a multivariate likelihood where constraints involve covariance parameters. The Hessian output from fmincon is a scalar, and I'm having some difficulty coding it on my own.
Likelihood in multi1_llf.m, constraints in mycon.m, optimization in optim1.m

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