Visual Basic - matrix

Dim vec As Integer() = {1, 3, 4, 8, 8, 5, 9, 1, 9}

        Dim vec2 As Integer()

        Dim i As Integer = 2

        Dim j As Integer = 6

        Dim k, l As Integer

        k = i - 1 ' index base 0

        l = j - k  ' Elementos entre ambos index

        vec2 = vec.Skip(k).Take(l).ToArray

        Console.WriteLine(String.Join(",", vec2)) 'resultado: 3,4,8,8,5

<System.Runtime.CompilerServices.Extension> Public Function SubArray(array As Integer(), Start As Integer, [End] As Integer) As Integer()

        Return array.Skip(Start - 1).Take([End] - Start + 1).ToArray

    End Function

Dim Vec As Integer() = {1, 2, 3, 4, 5, 6, 7, 8, 9}

        Console.WriteLine(String.Join(",", Vec.SubArray(3, 5))) ' Resultado: 3,4,5