chebft.txt

来自「VB常用数值算法集 内含有解线性代数方程组」· 文本 代码 · 共 19 行

Sub CHEBFT(A, B, C(), N)
    NMAX = 50
    Dim F(50)
    PI = 3.14159265358979
    BMA = 0.5 * (B - A)
    BPA = 0.5 * (B + A)
    For K = 1 To N
        Y = Cos(PI * (K - 0.5) / N)
        F(K) = FUNC(Y * BMA + BPA)
    Next K
    FAC = 2# / N
    For J = 1 To N
        Sum = 0#
        For K = 1 To N
            Sum = Sum + F(K) * Cos((PI * (J - 1)) * ((K - 0.5) / N))
        Next K
        C(J) = FAC * Sum
    Next J
End Sub