```
real(trace(Chi1_bar(1:N+1,1:N+1)*Vo))>=b1-(1/a1)*log((X1*t(1,1)*inv_pos(tau(1,1)+Y1*t(1,1)))-1);
Chi1_bar, a1, b1, X1,Y1 are constants and tau(1,1), t(1,1) and Vo are cvx variable.
Vo has order(1:N+1,1:N+1).
```

Giving error:

Disciplined convex programming error:

Cannot perform the operation: {real affine} .* {convex}