vb做曲线，并拟合和进行高斯消去

大家好，我是新手，原来都用c和C#的，现在用vb编程，很多问题都不明白，希望能遇到高手，多多指教，下面是一个程序的拟合，和高斯消去。我大学学过离散数学，数值分析，就是不太记得了，希望能够提点一下，帮我解释一下，我比较笨，越详细越好，谢谢。
，Public Function CurveFitting(X() As Single, Y() As Single, n As Integer, e As Integer) As Single()

'**** 曲线拟合 ****
   
    Dim A() As Single
    Dim C() As Single
    Dim B() As Single
    ReDim A(1 To n + 1, 1 To n + 1) As Single
    ReDim C(1 To n + 1) As Single
    ReDim B(1 To n + 1) As Single
    Dim Temp As Single
    Dim i, j, K As Integer
   
    For i = 0 To e
        For j = 0 To e
            For K = 1 To n
                A(i + 1, j + 1) = A(i + 1, j + 1) + X(K) ^ (j + i)
            Next K
        Next j
       
        For K = 1 To n
            C(i + 1) = C(i + 1) + X(K) ^ i * Y(K)
        Next K
    Next i
   
    B = SolvingEquations(A(), C(), e + 1)
    <