In the following code the input A is a vector of 0 and 1.

```
function SolverFor3R(A)
cvx_begin quiet
cvx_solver MOSEK
variable W(n)
subject to
for i=1:n
W(i)>=A(i);
end
```

If all elements of A are zero, the problem is solved without any problem. However, if one element becomes 1 then CVX return the following error:

```
Error using cvxprob/newcnstr (line 61)
Invalid CVX constraint: {cvx} >= {logical}
Error in >= (line 21)
b = newcnstr( evalin( 'caller', 'cvx_problem', '[]' ), x, y, '>=' );
Error in SolverFor3R (line 139)
W(i)>=A(i);
```