Phpml\Math\Matrix::inverse PHP Method

    public function inverse()
    {
        if (!$this->isSquare()) {
            throw MatrixException::notSquareMatrix();
        }
        $newMatrix = array();
        for ($i = 0; $i < $this->rows; ++$i) {
            for ($j = 0; $j < $this->columns; ++$j) {
                $minor = $this->crossOut($i, $j)->getDeterminant();
                $newMatrix[$i][$j] = fmod((double) ($i + $j), 2.0) == 0 ? $minor : -$minor;
            }
        }
        $cofactorMatrix = new self($newMatrix, false);
        return $cofactorMatrix->transpose()->divideByScalar($this->getDeterminant());
    }

 public function testInverseMatrix()
 {
     //http://ncalculators.com/matrix/inverse-matrix.htm
     $matrix = new Matrix([[3, 4, 2], [4, 5, 5], [1, 1, 1]]);
     $inverseMatrix = [[0, -1, 5], [1 / 2, 1 / 2, -7 / 2], [-1 / 2, 1 / 2, -1 / 2]];
     $this->assertEquals($inverseMatrix, $matrix->inverse()->toArray(), '', $delta = 0.0001);
 }