Define covariance of omega

Hi,

How could I denfine omegas with correlation to others?

iparams =  (
    Ω = [0.1 0.0;
        0.001 0.1],
...

When fitting, the error is

ERROR: PosDefException: matrix is not Hermitian; Cholesky factorization failed.

Best wishes.

Covariance matrices have to be symmetric so please try with

Ω = [0.1   0.001;
     0.001 0.1  ]