public function testSolverFailure()
{
$problem = new Problem([10, 10], [Constraint::fromString('1x + 1y = 20'), Constraint::fromString('0x + 1y <= 5'), Constraint::fromString('1x + 0y <= 5')]);
$solver = new Solver(Solver::MIN);
$solution = $solver->solve($problem);
$this->assertEquals($solution->getCount(), 0);
$this->assertEquals($solution->getCode(), 2);
$this->assertEquals($solution->getStatus(), 'Model is primal INFEASIBLE');
}
<?php
require 'vendor/autoload.php';
use makao\LPSolve\Constraint;
use makao\LPSolve\Problem;
use makao\LPSolve\Solver;
use makao\LPSolve\Solution;
// Example 1
$constraints = [Constraint::fromString('0a + 78.26b + 0c + 2.9d >= 92.3'), Constraint::fromString('0.24a + 0b + 11.31c + 0d <= 14.8'), Constraint::fromString('12.68a + 0b + 0.08c + 0.9d >= 4')];
$problem = new Problem([1, 3, 6.24, 0.1], $constraints, [28.6, 0, 0, 18], [Infinite, Infinite, Infinite, 48.98]);
$solver = new Solver(Solver::MIN);
$solution = $solver->solve($problem);
var_dump($solution);
// Example 2
$constraints = [Constraint::fromString('120x + 210y + 150.75z <= 15000'), Constraint::fromString('110x + 30y + 125z <= 4000'), Constraint::fromString('1x + 1y + 1z <= 75')];
$problem = new Problem([143, 60, 195], $constraints);
$solver = new Solver(Solver::MAX);
$solution = $solver->solve($problem);
var_dump($solution);
// Example 3: infeasible, no solutions
$constraints = [Constraint::fromString('1x + 1y = 20'), Constraint::fromString('0x + 1y <= 5'), Constraint::fromString('1x + 0y <= 5')];
$problem = new Problem([10, 10], $constraints);
$solver = new Solver(Solver::MIN);
$solution = $solver->solve($problem);
var_dump($solution);