Hi every one,

I have the below

```
cvx_begin
variable A_tilda(2,m);
minimize (trace(A_tilda'*DD*A_tilda*G)-2*trace(D*A_tilda*PP));
subject to
bb*phi <= 1;
A_tilda * phi >= 0;
cvx_end
```

where m=10, DD is (2*2), G is (10*10), D is (3*2), PP is (10*3), bb is (1*10) and phi is (10*1).

I tried to run it but i have error message and this message is

{Error using * (line 109)

Disciplined convex programming error:

Invalid quadratic form: not a scalar.}

and that line (i.e. line 109) is the minimization line within the cvx.

Can anyone help me with this issue.