d5r5.txt

VB常用数值算法集 内含有解线性代数方程组

Private Sub Command1_Click()
    'PROGRAM D5R5
    'Driver for routine CHEBEV
    NVAL = 40
    PIO2 = 1.5707963
    Dim C(40)
    A = -PIO2
    B = PIO2
    Call CHEBFT(A, B, C(), NVAL)
    'Test Chebyshev evaluation routine
    Print
    Print Tab(5); "How many terms in Chebyshev evaluation?"
    'Input MVAL , between 6 and 40, MVAL=0 TO END
    MVAL = 20
    Print Tab(5); MVAL
    If (MVAL <= 0) Or (MVAL > NVAL) Then Exit Sub
    Print Tab(5); "     X         Actual       Chebyshev fit"
    For I = -8 To 8 Step 1
        X = I * PIO2 / 10#
        Print Tab(5); Format$(X, "#0.000000");
        Print Tab(19); Format$(FUNC(X), "0.000000");
        Print Tab(35); Format$(CHEBEV(A, B, C(), MVAL, X), "#0.000000");
    Next I
End Sub
Function FUNC(X)
    FUNC = (X ^ 2) * (X ^ 2 - 2#) * Sin(X)
End Function