QLNet.TridiagonalOperator.subtract C# (CSharp) Метод

        public IOperator subtract(IOperator A, IOperator B)
        {
            TridiagonalOperator D1 = A as TridiagonalOperator;
            TridiagonalOperator D2 = B as TridiagonalOperator;

            Vector low = D1.lowerDiagonal_-D2.lowerDiagonal_,
                   mid = D1.diagonal_-D2.diagonal_,
                   high = D1.upperDiagonal_-D2.upperDiagonal_;
            TridiagonalOperator result = new TridiagonalOperator(low,mid,high);
            return result;
        }