Hi guys:

I want to find the optimal complex vector a(4,1) in the following case:

cvx_begin

variable d;

variable a(4,1) complex;

```
maximize (d);
subject to
sum_square_abs(a)>=d;
sum_square_abs(a)<=4;
```

cvx_end

but I will get error:

Disciplined convex programming error:

Invalid constraint: {convex} >= {real affine}

is any modificiation I can make to avoid it?

Thank you!