Hi,

I use Mosek solver in cvx to solve a geometric programming.

In the objective I have the following function:

Y*log(YXZ) where Y , X and Z are variables.I tried to implement it with CVX as

```
maximize(sum(sum(rel_entr(Y,1./(X.*Z)))))
```

I got this error: Illegal operation: rel_entr( {log-affine}, {log-affine} ).

Could you please help in in this problem?