```
Hello all,
I have a problem with my code.
I have a variables:
variable Por(1,3);
and some other variables which finally has been used in a function and made a vector with size of 24, "u" (where u(x1,..xn)=A*x1+...Z*xn))
so we have:
u : CVX real affine expression (24x1 vector)
Por : CVX real affine expression (1x3 vector)
y : a costant vector (3x24 matrix)
my function in CVX is:
Min (Por*y*u)
why this line (Min (Por*y*u)) cause this error?
??? Error using ==> cvx.mtimes at 152
Disciplined convex programming error:
Cannot perform the operation {affine}*{mixed convex/constant}
hat should I do to solve that?
```

Your problem is very likely nonconvex, and CVX cannot solve it.