highs

Safe rust bindings to the Highs MILP Solver.

Usage example

```rust

fn main() { // max: x + 2y + z // under constraints: // c1: 3x + y <= 6 // c2: y + 2z <= 7 let mut pb = Problem::default(); let c1 = pb.addrow(..6.); let c2 = pb.addrow(..7.); // x pb.addcolumn( 1., // the coefficient in front of x in the objective function 0.., // x is in the range 0, +∞ &[ // Giving a slice, but anything that can be iterated over will do (c1, 3.) // The coefficient in front of x in the c1 constraint ] ); // y pb.addcolumn(2., 0.., vec![(c1, 1.), (c2, 1.)]); // z pb.addcolumn(1., 0.., vec![(c2, 2.)]); let mut model = Model::default(); model.setproblem(pb); model.set_sense(Sense::Maximise);

let solved = model.solve();

assert_eq!(solved.status(), HighsModelStatus::Optimal);

let solution = solved.get_solution();
// The expected solution is x=0  y=6  z=0.5
assert_eq!(solution.columns(), vec![0., 6., 0.5]);
// All the constraints are at their maximum
assert_eq!(solution.rows(), vec![6., 7.]);

} ```