when I try the following program,I came across with the following problems

```
cvx_begin
variable w_x(n,1) complex;
aaa=w_x'*Rx*w_x;
minimize(aaa+norm(w_x'*a_x,1));
subject to
w_x'*steer==1;
cvx_end
cvx_status
```

Error using ==> cvx.mtimes at 258
Disciplined convex programming error:
Invalid quadratic form: product is complex.

Error in ==> Capon_beamforming at 37
aaa=max(abs(w_x’Rx w_x));
I am new to cvx,please help me out!!!

Considering that you are dealing with a beamforming problem, maybe you are interested in minimize “abs(aaa)” or “norm(aaa)” instead of the complex value directly.

If R_x is hermitian, how to deal with it? THX

mcg
(Michael C. Grant)
April 10, 2016, 3:09am
5
In that case, `w_x'*Rx*w_x`

is supposed to be real, but it won’t be due to floating-point roundoff error. So just replace it with `real(w_x'*Rx*w_x)`

.

1 Like

Hi all, did you get the solution following the Michael’s answer ? I got the same error but when I tried with Real, it doesn’t work.

xjbaicai
(Xjbaicai)
September 25, 2023, 1:03pm
8
So do I！ Did you solve it?