ommx 3.0.0-beta.2

Open Mathematical prograMming eXchange (OMMX)
Documentation 
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# Decision Variables: `Bound`, `Kind`, and `DecisionVariable`

Decision variables define the unknowns in optimization problems. Each variable has a [`Kind`](crate::Kind)
(continuous, binary, integer, etc.) and [`Bound`](crate::Bound) (lower/upper limits).

```rust
use ommx::{DecisionVariable, Kind, Bound, ATol};

// Binary decision variable row
let binary_var = DecisionVariable::binary();
assert_eq!(binary_var.kind(), Kind::Binary);
assert_eq!(binary_var.bound(), Bound::new(0.0, 1.0)?); // Default binary bound is [0, 1]

// Integer variable with bound [0, 3]
let integer_var = DecisionVariable::integer()
    .with_bound(Bound::new(0.0, 3.0)?, ATol::default())?;
assert_eq!(integer_var.kind(), Kind::Integer);
assert_eq!(integer_var.bound(), Bound::new(0.0, 3.0)?);

// Continuous decision variable row
let continuous_var = DecisionVariable::continuous();
assert_eq!(continuous_var.kind(), Kind::Continuous);
assert_eq!(continuous_var.bound(), Bound::unbounded()); // Default is unbounded (-inf, inf)
# Ok::<(), Box<dyn std::error::Error>>(())
```