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SUBROUTINE DFFTF1 (N,C,CH,WA,IFAC)
IMPLICIT DOUBLE PRECISION (A-H,O-Z)
DIMENSION CH(*) ,C(*) ,WA(*) ,IFAC(*)
NF = IFAC(2)
NA = 1
L2 = N
IW = N
DO 111 K1=1,NF
KH = NF-K1
IP = IFAC(KH+3)
L1 = L2/IP
IDO = N/L2
IDL1 = IDO*L1
IW = IW-(IP-1)*IDO
NA = 1-NA
IF (IP .NE. 4) GO TO 102
IX2 = IW+IDO
IX3 = IX2+IDO
IF (NA .NE. 0) GO TO 101
CALL DADF4 (IDO,L1,C,CH,WA(IW),WA(IX2),WA(IX3))
GO TO 110
101 CALL DADF4 (IDO,L1,CH,C,WA(IW),WA(IX2),WA(IX3))
GO TO 110
102 IF (IP .NE. 2) GO TO 104
IF (NA .NE. 0) GO TO 103
CALL DADF2 (IDO,L1,C,CH,WA(IW))
GO TO 110
103 CALL DADF2 (IDO,L1,CH,C,WA(IW))
GO TO 110
104 IF (IP .NE. 3) GO TO 106
IX2 = IW+IDO
IF (NA .NE. 0) GO TO 105
CALL DADF3 (IDO,L1,C,CH,WA(IW),WA(IX2))
GO TO 110
105 CALL DADF3 (IDO,L1,CH,C,WA(IW),WA(IX2))
GO TO 110
106 IF (IP .NE. 5) GO TO 108
IX2 = IW+IDO
IX3 = IX2+IDO
IX4 = IX3+IDO
IF (NA .NE. 0) GO TO 107
CALL DADF5 (IDO,L1,C,CH,WA(IW),WA(IX2),WA(IX3),WA(IX4))
GO TO 110
107 CALL DADF5 (IDO,L1,CH,C,WA(IW),WA(IX2),WA(IX3),WA(IX4))
GO TO 110
108 IF (IDO .EQ. 1) NA = 1-NA
IF (NA .NE. 0) GO TO 109
CALL DADFG (IDO,IP,L1,IDL1,C,C,C,CH,CH,WA(IW))
NA = 1
GO TO 110
109 CALL DADFG (IDO,IP,L1,IDL1,CH,CH,CH,C,C,WA(IW))
NA = 0
110 L2 = L1
111 CONTINUE
IF (NA .EQ. 1) RETURN
DO 112 I=1,N
C(I) = CH(I)
112 CONTINUE
RETURN
END
SUBROUTINE DADFG (IDO,IP,L1,IDL1,CC,C1,C2,CH,CH2,WA)
IMPLICIT DOUBLE PRECISION (A-H,O-Z)
DIMENSION CH(IDO,L1,IP) ,CC(IDO,IP,L1) ,
1 C1(IDO,L1,IP) ,C2(IDL1,IP),
2 CH2(IDL1,IP) ,WA(1)
DATA TPI/6.28318530717958647692D0/
ARG = TPI/FLOAT(IP)
DCP = COS(ARG)
DSP = SIN(ARG)
IPPH = (IP+1)/2
IPP2 = IP+2
IDP2 = IDO+2
NBD = (IDO-1)/2
IF (IDO .EQ. 1) GO TO 119
DO 101 IK=1,IDL1
CH2(IK,1) = C2(IK,1)
101 CONTINUE
DO 103 J=2,IP
DO 102 K=1,L1
CH(1,K,J) = C1(1,K,J)
102 CONTINUE
103 CONTINUE
IF (NBD .GT. L1) GO TO 107
IS = -IDO
DO 106 J=2,IP
IS = IS+IDO
IDIJ = IS
DO 105 I=3,IDO,2
IDIJ = IDIJ+2
DO 104 K=1,L1
CH(I-1,K,J) = WA(IDIJ-1)*C1(I-1,K,J)+WA(IDIJ)*C1(I,K,J)
CH(I,K,J) = WA(IDIJ-1)*C1(I,K,J)-WA(IDIJ)*C1(I-1,K,J)
104 CONTINUE
105 CONTINUE
106 CONTINUE
GO TO 111
107 IS = -IDO
DO 110 J=2,IP
IS = IS+IDO
DO 109 K=1,L1
IDIJ = IS
DO 108 I=3,IDO,2
IDIJ = IDIJ+2
CH(I-1,K,J) = WA(IDIJ-1)*C1(I-1,K,J)+WA(IDIJ)*C1(I,K,J)
CH(I,K,J) = WA(IDIJ-1)*C1(I,K,J)-WA(IDIJ)*C1(I-1,K,J)
108 CONTINUE
109 CONTINUE
110 CONTINUE
111 IF (NBD .LT. L1) GO TO 115
DO 114 J=2,IPPH
JC = IPP2-J
DO 113 K=1,L1
DO 112 I=3,IDO,2
C1(I-1,K,J) = CH(I-1,K,J)+CH(I-1,K,JC)
C1(I-1,K,JC) = CH(I,K,J)-CH(I,K,JC)
C1(I,K,J) = CH(I,K,J)+CH(I,K,JC)
C1(I,K,JC) = CH(I-1,K,JC)-CH(I-1,K,J)
112 CONTINUE
113 CONTINUE
114 CONTINUE
GO TO 121
115 DO 118 J=2,IPPH
JC = IPP2-J
DO 117 I=3,IDO,2
DO 116 K=1,L1
C1(I-1,K,J) = CH(I-1,K,J)+CH(I-1,K,JC)
C1(I-1,K,JC) = CH(I,K,J)-CH(I,K,JC)
C1(I,K,J) = CH(I,K,J)+CH(I,K,JC)
C1(I,K,JC) = CH(I-1,K,JC)-CH(I-1,K,J)
116 CONTINUE
117 CONTINUE
118 CONTINUE
GO TO 121
119 DO 120 IK=1,IDL1
C2(IK,1) = CH2(IK,1)
120 CONTINUE
121 DO 123 J=2,IPPH
JC = IPP2-J
DO 122 K=1,L1
C1(1,K,J) = CH(1,K,J)+CH(1,K,JC)
C1(1,K,JC) = CH(1,K,JC)-CH(1,K,J)
122 CONTINUE
123 CONTINUE
C
AR1 = 1.0D0
AI1 = 0.0D0
DO 127 L=2,IPPH
LC = IPP2-L
AR1H = DCP*AR1-DSP*AI1
AI1 = DCP*AI1+DSP*AR1
AR1 = AR1H
DO 124 IK=1,IDL1
CH2(IK,L) = C2(IK,1)+AR1*C2(IK,2)
CH2(IK,LC) = AI1*C2(IK,IP)
124 CONTINUE
DC2 = AR1
DS2 = AI1
AR2 = AR1
AI2 = AI1
DO 126 J=3,IPPH
JC = IPP2-J
AR2H = DC2*AR2-DS2*AI2
AI2 = DC2*AI2+DS2*AR2
AR2 = AR2H
DO 125 IK=1,IDL1
CH2(IK,L) = CH2(IK,L)+AR2*C2(IK,J)
CH2(IK,LC) = CH2(IK,LC)+AI2*C2(IK,JC)
125 CONTINUE
126 CONTINUE
127 CONTINUE
DO 129 J=2,IPPH
DO 128 IK=1,IDL1
CH2(IK,1) = CH2(IK,1)+C2(IK,J)
128 CONTINUE
129 CONTINUE
C
IF (IDO .LT. L1) GO TO 132
DO 131 K=1,L1
DO 130 I=1,IDO
CC(I,1,K) = CH(I,K,1)
130 CONTINUE
131 CONTINUE
GO TO 135
132 DO 134 I=1,IDO
DO 133 K=1,L1
CC(I,1,K) = CH(I,K,1)
133 CONTINUE
134 CONTINUE
135 DO 137 J=2,IPPH
JC = IPP2-J
J2 = J+J
DO 136 K=1,L1
CC(IDO,J2-2,K) = CH(1,K,J)
CC(1,J2-1,K) = CH(1,K,JC)
136 CONTINUE
137 CONTINUE
IF (IDO .EQ. 1) RETURN
IF (NBD .LT. L1) GO TO 141
DO 140 J=2,IPPH
JC = IPP2-J
J2 = J+J
DO 139 K=1,L1
DO 138 I=3,IDO,2
IC = IDP2-I
CC(I-1,J2-1,K) = CH(I-1,K,J)+CH(I-1,K,JC)
CC(IC-1,J2-2,K) = CH(I-1,K,J)-CH(I-1,K,JC)
CC(I,J2-1,K) = CH(I,K,J)+CH(I,K,JC)
CC(IC,J2-2,K) = CH(I,K,JC)-CH(I,K,J)
138 CONTINUE
139 CONTINUE
140 CONTINUE
RETURN
141 DO 144 J=2,IPPH
JC = IPP2-J
J2 = J+J
DO 143 I=3,IDO,2
IC = IDP2-I
DO 142 K=1,L1
CC(I-1,J2-1,K) = CH(I-1,K,J)+CH(I-1,K,JC)
CC(IC-1,J2-2,K) = CH(I-1,K,J)-CH(I-1,K,JC)
CC(I,J2-1,K) = CH(I,K,J)+CH(I,K,JC)
CC(IC,J2-2,K) = CH(I,K,JC)-CH(I,K,J)
142 CONTINUE
143 CONTINUE
144 CONTINUE
RETURN
END
SUBROUTINE DADF2 (IDO,L1,CC,CH,WA1)
IMPLICIT DOUBLE PRECISION (A-H,O-Z)
DIMENSION CH(IDO,2,L1) ,CC(IDO,L1,2) ,
1 WA1(1)
DO 101 K=1,L1
CH(1,1,K) = CC(1,K,1)+CC(1,K,2)
CH(IDO,2,K) = CC(1,K,1)-CC(1,K,2)
101 CONTINUE
IF (IDO.lt.2) GO TO 107
IF (IDO.eq.2) GO TO 105
GO TO 102
102 IDP2 = IDO+2
DO 104 K=1,L1
DO 103 I=3,IDO,2
IC = IDP2-I
TR2 = WA1(I-2)*CC(I-1,K,2)+WA1(I-1)*CC(I,K,2)
TI2 = WA1(I-2)*CC(I,K,2)-WA1(I-1)*CC(I-1,K,2)
CH(I,1,K) = CC(I,K,1)+TI2
CH(IC,2,K) = TI2-CC(I,K,1)
CH(I-1,1,K) = CC(I-1,K,1)+TR2
CH(IC-1,2,K) = CC(I-1,K,1)-TR2
103 CONTINUE
104 CONTINUE
IF (MOD(IDO,2) .EQ. 1) RETURN
105 DO 106 K=1,L1
CH(1,2,K) = -CC(IDO,K,2)
CH(IDO,1,K) = CC(IDO,K,1)
106 CONTINUE
107 RETURN
END
SUBROUTINE DADF3 (IDO,L1,CC,CH,WA1,WA2)
IMPLICIT DOUBLE PRECISION (A-H,O-Z)
DIMENSION CH(IDO,3,L1) ,CC(IDO,L1,3) ,
1 WA1(1) ,WA2(1)
C *** TAUI IS -SQRT(3)/2 ***
DATA TAUR,TAUI /-0.5D0,0.86602540378443864676D0/
DO 101 K=1,L1
CR2 = CC(1,K,2)+CC(1,K,3)
CH(1,1,K) = CC(1,K,1)+CR2
CH(1,3,K) = TAUI*(CC(1,K,3)-CC(1,K,2))
CH(IDO,2,K) = CC(1,K,1)+TAUR*CR2
101 CONTINUE
IF (IDO .EQ. 1) RETURN
IDP2 = IDO+2
DO 103 K=1,L1
DO 102 I=3,IDO,2
IC = IDP2-I
DR2 = WA1(I-2)*CC(I-1,K,2)+WA1(I-1)*CC(I,K,2)
DI2 = WA1(I-2)*CC(I,K,2)-WA1(I-1)*CC(I-1,K,2)
DR3 = WA2(I-2)*CC(I-1,K,3)+WA2(I-1)*CC(I,K,3)
DI3 = WA2(I-2)*CC(I,K,3)-WA2(I-1)*CC(I-1,K,3)
CR2 = DR2+DR3
CI2 = DI2+DI3
CH(I-1,1,K) = CC(I-1,K,1)+CR2
CH(I,1,K) = CC(I,K,1)+CI2
TR2 = CC(I-1,K,1)+TAUR*CR2
TI2 = CC(I,K,1)+TAUR*CI2
TR3 = TAUI*(DI2-DI3)
TI3 = TAUI*(DR3-DR2)
CH(I-1,3,K) = TR2+TR3
CH(IC-1,2,K) = TR2-TR3
CH(I,3,K) = TI2+TI3
CH(IC,2,K) = TI3-TI2
102 CONTINUE
103 CONTINUE
RETURN
END
SUBROUTINE DADF4 (IDO,L1,CC,CH,WA1,WA2,WA3)
IMPLICIT DOUBLE PRECISION (A-H,O-Z)
DIMENSION CC(IDO,L1,4) ,CH(IDO,4,L1) ,
1 WA1(1) ,WA2(1) ,WA3(1)
DATA HSQT2 /0.70710678118654752440D0/
DO 101 K=1,L1
TR1 = CC(1,K,2)+CC(1,K,4)
TR2 = CC(1,K,1)+CC(1,K,3)
CH(1,1,K) = TR1+TR2
CH(IDO,4,K) = TR2-TR1
CH(IDO,2,K) = CC(1,K,1)-CC(1,K,3)
CH(1,3,K) = CC(1,K,4)-CC(1,K,2)
101 CONTINUE
IF (IDO.lt.2) GO TO 107
IF (IDO.eq.2) GO TO 105
GO TO 102
102 IDP2 = IDO+2
DO 104 K=1,L1
DO 103 I=3,IDO,2
IC = IDP2-I
CR2 = WA1(I-2)*CC(I-1,K,2)+WA1(I-1)*CC(I,K,2)
CI2 = WA1(I-2)*CC(I,K,2)-WA1(I-1)*CC(I-1,K,2)
CR3 = WA2(I-2)*CC(I-1,K,3)+WA2(I-1)*CC(I,K,3)
CI3 = WA2(I-2)*CC(I,K,3)-WA2(I-1)*CC(I-1,K,3)
CR4 = WA3(I-2)*CC(I-1,K,4)+WA3(I-1)*CC(I,K,4)
CI4 = WA3(I-2)*CC(I,K,4)-WA3(I-1)*CC(I-1,K,4)
TR1 = CR2+CR4
TR4 = CR4-CR2
TI1 = CI2+CI4
TI4 = CI2-CI4
TI2 = CC(I,K,1)+CI3
TI3 = CC(I,K,1)-CI3
TR2 = CC(I-1,K,1)+CR3
TR3 = CC(I-1,K,1)-CR3
CH(I-1,1,K) = TR1+TR2
CH(IC-1,4,K) = TR2-TR1
CH(I,1,K) = TI1+TI2
CH(IC,4,K) = TI1-TI2
CH(I-1,3,K) = TI4+TR3
CH(IC-1,2,K) = TR3-TI4
CH(I,3,K) = TR4+TI3
CH(IC,2,K) = TR4-TI3
103 CONTINUE
104 CONTINUE
IF (MOD(IDO,2) .EQ. 1) RETURN
105 CONTINUE
DO 106 K=1,L1
TI1 = -HSQT2*(CC(IDO,K,2)+CC(IDO,K,4))
TR1 = HSQT2*(CC(IDO,K,2)-CC(IDO,K,4))
CH(IDO,1,K) = TR1+CC(IDO,K,1)
CH(IDO,3,K) = CC(IDO,K,1)-TR1
CH(1,2,K) = TI1-CC(IDO,K,3)
CH(1,4,K) = TI1+CC(IDO,K,3)
106 CONTINUE
107 RETURN
END
SUBROUTINE DADF5 (IDO,L1,CC,CH,WA1,WA2,WA3,WA4)
IMPLICIT DOUBLE PRECISION (A-H,O-Z)
DIMENSION CC(IDO,L1,5) ,CH(IDO,5,L1) ,
1 WA1(1) ,WA2(1) ,WA3(1) ,WA4(1)
DATA TR11,TI11,TR12,TI12 /0.3090169943749474241D0,
+ 0.95105651629515357212D0,
1 -0.8090169943749474241D0, 0.58778525229247312917D0/
DO 101 K=1,L1
CR2 = CC(1,K,5)+CC(1,K,2)
CI5 = CC(1,K,5)-CC(1,K,2)
CR3 = CC(1,K,4)+CC(1,K,3)
CI4 = CC(1,K,4)-CC(1,K,3)
CH(1,1,K) = CC(1,K,1)+CR2+CR3
CH(IDO,2,K) = CC(1,K,1)+TR11*CR2+TR12*CR3
CH(1,3,K) = TI11*CI5+TI12*CI4
CH(IDO,4,K) = CC(1,K,1)+TR12*CR2+TR11*CR3
CH(1,5,K) = TI12*CI5-TI11*CI4
101 CONTINUE
IF (IDO .EQ. 1) RETURN
IDP2 = IDO+2
DO 103 K=1,L1
DO 102 I=3,IDO,2
IC = IDP2-I
DR2 = WA1(I-2)*CC(I-1,K,2)+WA1(I-1)*CC(I,K,2)
DI2 = WA1(I-2)*CC(I,K,2)-WA1(I-1)*CC(I-1,K,2)
DR3 = WA2(I-2)*CC(I-1,K,3)+WA2(I-1)*CC(I,K,3)
DI3 = WA2(I-2)*CC(I,K,3)-WA2(I-1)*CC(I-1,K,3)
DR4 = WA3(I-2)*CC(I-1,K,4)+WA3(I-1)*CC(I,K,4)
DI4 = WA3(I-2)*CC(I,K,4)-WA3(I-1)*CC(I-1,K,4)
DR5 = WA4(I-2)*CC(I-1,K,5)+WA4(I-1)*CC(I,K,5)
DI5 = WA4(I-2)*CC(I,K,5)-WA4(I-1)*CC(I-1,K,5)
CR2 = DR2+DR5
CI5 = DR5-DR2
CR5 = DI2-DI5
CI2 = DI2+DI5
CR3 = DR3+DR4
CI4 = DR4-DR3
CR4 = DI3-DI4
CI3 = DI3+DI4
CH(I-1,1,K) = CC(I-1,K,1)+CR2+CR3
CH(I,1,K) = CC(I,K,1)+CI2+CI3
TR2 = CC(I-1,K,1)+TR11*CR2+TR12*CR3
TI2 = CC(I,K,1)+TR11*CI2+TR12*CI3
TR3 = CC(I-1,K,1)+TR12*CR2+TR11*CR3
TI3 = CC(I,K,1)+TR12*CI2+TR11*CI3
TR5 = TI11*CR5+TI12*CR4
TI5 = TI11*CI5+TI12*CI4
TR4 = TI12*CR5-TI11*CR4
TI4 = TI12*CI5-TI11*CI4
CH(I-1,3,K) = TR2+TR5
CH(IC-1,2,K) = TR2-TR5
CH(I,3,K) = TI2+TI5
CH(IC,2,K) = TI5-TI2
CH(I-1,5,K) = TR3+TR4
CH(IC-1,4,K) = TR3-TR4
CH(I,5,K) = TI3+TI4
CH(IC,4,K) = TI4-TI3
102 CONTINUE
103 CONTINUE
RETURN
END
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