[2759] | 1 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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| 2 | ! |
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| 3 | ! FFTPACK 5.0 |
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| 4 | ! Copyright (C) 1995-2004, Scientific Computing Division, |
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| 5 | ! University Corporation for Atmospheric Research |
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| 6 | ! Licensed under the GNU General Public License (GPL) |
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| 7 | ! |
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| 8 | ! Authors: Paul N. Swarztrauber and Richard A. Valent |
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| 9 | ! |
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| 10 | ! $Id: r1fgkf.f,v 1.2 2004/06/15 21:29:20 rodney Exp $ |
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| 11 | ! |
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| 12 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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| 13 | |
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| 14 | SUBROUTINE R1FGKF (IDO,IP,L1,IDL1,CC,C1,C2,IN1, & |
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| 15 | & CH,CH2,IN2,WA) |
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| 16 | REAL CH(IN2,IDO,L1,IP) ,CC(IN1,IDO,IP,L1), & |
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| 17 | & C1(IN1,IDO,L1,IP) ,C2(IN1,IDL1,IP), & |
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| 18 | & CH2(IN2,IDL1,IP) ,WA(IDO) |
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| 19 | ! |
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| 20 | TPI=2.*4.*ATAN(1.0) |
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| 21 | ARG = TPI/FLOAT(IP) |
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| 22 | DCP = COS(ARG) |
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| 23 | DSP = SIN(ARG) |
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| 24 | IPPH = (IP+1)/2 |
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| 25 | IPP2 = IP+2 |
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| 26 | IDP2 = IDO+2 |
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| 27 | NBD = (IDO-1)/2 |
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| 28 | IF (IDO .EQ. 1) GO TO 119 |
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| 29 | DO 101 IK=1,IDL1 |
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| 30 | CH2(1,IK,1) = C2(1,IK,1) |
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| 31 | 101 END DO |
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| 32 | DO 103 J=2,IP |
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| 33 | DO 102 K=1,L1 |
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| 34 | CH(1,1,K,J) = C1(1,1,K,J) |
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| 35 | 102 CONTINUE |
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| 36 | 103 END DO |
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| 37 | IF (NBD .GT. L1) GO TO 107 |
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| 38 | IS = -IDO |
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| 39 | DO 106 J=2,IP |
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| 40 | IS = IS+IDO |
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| 41 | IDIJ = IS |
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| 42 | DO 105 I=3,IDO,2 |
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| 43 | IDIJ = IDIJ+2 |
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| 44 | DO 104 K=1,L1 |
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| 45 | CH(1,I-1,K,J) = WA(IDIJ-1)*C1(1,I-1,K,J)+WA(IDIJ) & |
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| 46 | & *C1(1,I,K,J) |
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| 47 | CH(1,I,K,J) = WA(IDIJ-1)*C1(1,I,K,J)-WA(IDIJ) & |
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| 48 | & *C1(1,I-1,K,J) |
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| 49 | 104 CONTINUE |
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| 50 | 105 CONTINUE |
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| 51 | 106 END DO |
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| 52 | GO TO 111 |
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| 53 | 107 IS = -IDO |
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| 54 | DO 110 J=2,IP |
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| 55 | IS = IS+IDO |
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| 56 | DO 109 K=1,L1 |
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| 57 | IDIJ = IS |
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| 58 | DO 108 I=3,IDO,2 |
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| 59 | IDIJ = IDIJ+2 |
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| 60 | CH(1,I-1,K,J) = WA(IDIJ-1)*C1(1,I-1,K,J)+WA(IDIJ) & |
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| 61 | & *C1(1,I,K,J) |
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| 62 | CH(1,I,K,J) = WA(IDIJ-1)*C1(1,I,K,J)-WA(IDIJ) & |
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| 63 | & *C1(1,I-1,K,J) |
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| 64 | 108 CONTINUE |
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| 65 | 109 CONTINUE |
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| 66 | 110 END DO |
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| 67 | 111 IF (NBD .LT. L1) GO TO 115 |
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| 68 | DO 114 J=2,IPPH |
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| 69 | JC = IPP2-J |
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| 70 | DO 113 K=1,L1 |
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| 71 | DO 112 I=3,IDO,2 |
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| 72 | C1(1,I-1,K,J) = CH(1,I-1,K,J)+CH(1,I-1,K,JC) |
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| 73 | C1(1,I-1,K,JC) = CH(1,I,K,J)-CH(1,I,K,JC) |
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| 74 | C1(1,I,K,J) = CH(1,I,K,J)+CH(1,I,K,JC) |
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| 75 | C1(1,I,K,JC) = CH(1,I-1,K,JC)-CH(1,I-1,K,J) |
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| 76 | 112 CONTINUE |
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| 77 | 113 CONTINUE |
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| 78 | 114 END DO |
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| 79 | GO TO 121 |
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| 80 | 115 DO 118 J=2,IPPH |
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| 81 | JC = IPP2-J |
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| 82 | DO 117 I=3,IDO,2 |
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| 83 | DO 116 K=1,L1 |
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| 84 | C1(1,I-1,K,J) = CH(1,I-1,K,J)+CH(1,I-1,K,JC) |
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| 85 | C1(1,I-1,K,JC) = CH(1,I,K,J)-CH(1,I,K,JC) |
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| 86 | C1(1,I,K,J) = CH(1,I,K,J)+CH(1,I,K,JC) |
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| 87 | C1(1,I,K,JC) = CH(1,I-1,K,JC)-CH(1,I-1,K,J) |
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| 88 | 116 CONTINUE |
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| 89 | 117 CONTINUE |
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| 90 | 118 END DO |
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| 91 | GO TO 121 |
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| 92 | 119 DO 120 IK=1,IDL1 |
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| 93 | C2(1,IK,1) = CH2(1,IK,1) |
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| 94 | 120 END DO |
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| 95 | 121 DO 123 J=2,IPPH |
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| 96 | JC = IPP2-J |
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| 97 | DO 122 K=1,L1 |
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| 98 | C1(1,1,K,J) = CH(1,1,K,J)+CH(1,1,K,JC) |
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| 99 | C1(1,1,K,JC) = CH(1,1,K,JC)-CH(1,1,K,J) |
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| 100 | 122 CONTINUE |
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| 101 | 123 END DO |
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| 102 | ! |
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| 103 | AR1 = 1. |
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| 104 | AI1 = 0. |
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| 105 | DO 127 L=2,IPPH |
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| 106 | LC = IPP2-L |
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| 107 | AR1H = DCP*AR1-DSP*AI1 |
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| 108 | AI1 = DCP*AI1+DSP*AR1 |
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| 109 | AR1 = AR1H |
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| 110 | DO 124 IK=1,IDL1 |
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| 111 | CH2(1,IK,L) = C2(1,IK,1)+AR1*C2(1,IK,2) |
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| 112 | CH2(1,IK,LC) = AI1*C2(1,IK,IP) |
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| 113 | 124 CONTINUE |
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| 114 | DC2 = AR1 |
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| 115 | DS2 = AI1 |
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| 116 | AR2 = AR1 |
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| 117 | AI2 = AI1 |
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| 118 | DO 126 J=3,IPPH |
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| 119 | JC = IPP2-J |
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| 120 | AR2H = DC2*AR2-DS2*AI2 |
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| 121 | AI2 = DC2*AI2+DS2*AR2 |
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| 122 | AR2 = AR2H |
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| 123 | DO 125 IK=1,IDL1 |
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| 124 | CH2(1,IK,L) = CH2(1,IK,L)+AR2*C2(1,IK,J) |
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| 125 | CH2(1,IK,LC) = CH2(1,IK,LC)+AI2*C2(1,IK,JC) |
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| 126 | 125 CONTINUE |
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| 127 | 126 CONTINUE |
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| 128 | 127 END DO |
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| 129 | DO 129 J=2,IPPH |
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| 130 | DO 128 IK=1,IDL1 |
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| 131 | CH2(1,IK,1) = CH2(1,IK,1)+C2(1,IK,J) |
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| 132 | 128 CONTINUE |
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| 133 | 129 END DO |
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| 134 | ! |
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| 135 | IF (IDO .LT. L1) GO TO 132 |
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| 136 | DO 131 K=1,L1 |
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| 137 | DO 130 I=1,IDO |
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| 138 | CC(1,I,1,K) = CH(1,I,K,1) |
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| 139 | 130 CONTINUE |
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| 140 | 131 END DO |
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| 141 | GO TO 135 |
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| 142 | 132 DO 134 I=1,IDO |
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| 143 | DO 133 K=1,L1 |
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| 144 | CC(1,I,1,K) = CH(1,I,K,1) |
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| 145 | 133 CONTINUE |
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| 146 | 134 END DO |
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| 147 | 135 DO 137 J=2,IPPH |
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| 148 | JC = IPP2-J |
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| 149 | J2 = J+J |
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| 150 | DO 136 K=1,L1 |
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| 151 | CC(1,IDO,J2-2,K) = CH(1,1,K,J) |
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| 152 | CC(1,1,J2-1,K) = CH(1,1,K,JC) |
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| 153 | 136 CONTINUE |
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| 154 | 137 END DO |
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| 155 | IF (IDO .EQ. 1) RETURN |
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| 156 | IF (NBD .LT. L1) GO TO 141 |
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| 157 | DO 140 J=2,IPPH |
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| 158 | JC = IPP2-J |
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| 159 | J2 = J+J |
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| 160 | DO 139 K=1,L1 |
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| 161 | DO 138 I=3,IDO,2 |
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| 162 | IC = IDP2-I |
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| 163 | CC(1,I-1,J2-1,K) = CH(1,I-1,K,J)+CH(1,I-1,K,JC) |
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| 164 | CC(1,IC-1,J2-2,K) = CH(1,I-1,K,J)-CH(1,I-1,K,JC) |
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| 165 | CC(1,I,J2-1,K) = CH(1,I,K,J)+CH(1,I,K,JC) |
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| 166 | CC(1,IC,J2-2,K) = CH(1,I,K,JC)-CH(1,I,K,J) |
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| 167 | 138 CONTINUE |
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| 168 | 139 CONTINUE |
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| 169 | 140 END DO |
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| 170 | RETURN |
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| 171 | 141 DO 144 J=2,IPPH |
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| 172 | JC = IPP2-J |
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| 173 | J2 = J+J |
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| 174 | DO 143 I=3,IDO,2 |
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| 175 | IC = IDP2-I |
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| 176 | DO 142 K=1,L1 |
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| 177 | CC(1,I-1,J2-1,K) = CH(1,I-1,K,J)+CH(1,I-1,K,JC) |
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| 178 | CC(1,IC-1,J2-2,K) = CH(1,I-1,K,J)-CH(1,I-1,K,JC) |
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| 179 | CC(1,I,J2-1,K) = CH(1,I,K,J)+CH(1,I,K,JC) |
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| 180 | CC(1,IC,J2-2,K) = CH(1,I,K,JC)-CH(1,I,K,J) |
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| 181 | 142 CONTINUE |
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| 182 | 143 CONTINUE |
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| 183 | 144 END DO |
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| 184 | RETURN |
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| 185 | END |
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