I’m trying to solve a problem of the following form:

\min_\Sigma \quad \log\det(\Sigma) + v^T \Sigma^{-1} v

s.t. \quad \Sigma is (symmetric) positive semidefinite

I tried using **log_det** and **matrix_frac**, but it doesn’t work:

```
Disciplined convex programming error:
Illegal operation: {concave} + {convex}
```

Any ideas? Thanks!

(In this example we have closed-form solution, but it’s just a simplified version of my problem.)