?? bnldev.txt
字號:
Function BNLDEV(PP, N, IDUM&)
PI = 3.141592654
If PP <= 0.5 Then
P = PP
Else
P = 1# - PP
End If
AM = N * P
If N < 25 Then
BNL = 0#
For J = 1 To N
If RAN1(IDUM&) < P Then BNL = BNL + 1#
Next J
ElseIf AM < 1# Then
G = Exp(-AM)
T = 1#
For J = 0 To N
T = T * RAN1(IDUM&)
If T < G Then Exit For
Next J
If T >= G Then J = N
BNL = J
Else
If N <> NOLD Then
EN = N
OLDG = GAMMLN(EN + 1#)
NOLD = N
End If
If P <> POLD Then
PC = 1# - P
PLOG = Log(P)
PCLOG = Log(PC)
POLD = P
End If
SQ = Sqr(2# * AM * PC)
Do
Do
Y = Tan(PI * RAN1(IDUM&))
EM = SQ * Y + AM
Loop While (EM < 0) Or (EM >= EN + 1#)
EM = Int(EM)
T = EN - EM
T = Exp(OLDG - GAMMLN(EM + 1#) - GAMMLN(T + 1#) + EM * PLOG + T * PCLOG)
T = 1.2 * SQ * (1# + Y ^ 2) * T
Loop While RAN1(IDUM&) > T
BNL = EM
End If
If P <> PP Then BNL = N - BNL
BNLDEV = BNL
End Function
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