Hi,

I write a cvx code as below

```
cvx_begin
variable F(n, T)
variable S(m, T)
dual variable lambda
dual variables mu1
maximize geomean(F(:))
subject to
D = 1./(c-S);
P = R'*D;
lambda: R*F <= c
mu1: C1*P(1,:)' >= q1
% positivity constraints
F >= 0
F <= F_max
S >= 0
cvx_end
```

But, when I run it the following error will arise:

```
??? Error using ==> cvx.times at 173
Disciplined convex programming error:
Cannot perform the operation: {positive constant} ./ {real affine}
Error in ==> cvx.rdivide at 19
z = times( x, y, './' );
Error in ==>
D = 1./(c-S);
```

can anybody help me?