qgaus.txt

用VB实现数值积分的算法集。包括梯形求积法

Sub QGAUS(A, B, SS)
    Dim X(5), W(5)
    X(1) = 0.1488743389
    X(2) = 0.4333953941
    X(3) = 0.6794095682
    X(4) = 0.8650633666
    X(5) = 0.9739065285
    W(1) = 0.2955242247
    W(2) = 0.2692667193
    W(3) = 0.2190863625
    W(4) = 0.1494513491
    W(5) = 0.0666713443
    XM = 0.5 * (A + B)
    XR = 0.5 * (B - A)
    SS = 0#
    For J = 1 To 5
        DX = XR * X(J)
        SS = SS + W(J) * (FUNC(XM + DX) + FUNC(XM - DX))
    Next J
    SS = XR * SS
End Sub