1 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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2 | ! |
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3 | ! FFTPACK 5.0 |
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4 | ! |
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5 | ! Authors: Paul N. Swarztrauber and Richard A. Valent |
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6 | ! |
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7 | ! $Id: c1fgkf.f,v 1.2 2004/06/15 21:08:32 rodney Exp $ |
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8 | ! |
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9 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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10 | |
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11 | SUBROUTINE C1FGKF (IDO,IP,L1,LID,NA,CC,CC1,IN1, & |
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12 | & CH,CH1,IN2,WA) |
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13 | REAL CH(IN2,L1,IDO,IP) ,CC(IN1,L1,IP,IDO), & |
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14 | & CC1(IN1,LID,IP) ,CH1(IN2,LID,IP) , & |
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15 | & WA(IDO,IP-1,2) |
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16 | ! |
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17 | ! FFTPACK 5.0 auxiliary routine |
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18 | ! |
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19 | IPP2 = IP+2 |
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20 | IPPH = (IP+1)/2 |
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21 | DO 110 KI=1,LID |
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22 | CH1(1,KI,1) = CC1(1,KI,1) |
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23 | CH1(2,KI,1) = CC1(2,KI,1) |
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24 | 110 END DO |
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25 | DO 111 J=2,IPPH |
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26 | JC = IPP2-J |
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27 | DO 112 KI=1,LID |
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28 | CH1(1,KI,J) = CC1(1,KI,J)+CC1(1,KI,JC) |
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29 | CH1(1,KI,JC) = CC1(1,KI,J)-CC1(1,KI,JC) |
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30 | CH1(2,KI,J) = CC1(2,KI,J)+CC1(2,KI,JC) |
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31 | CH1(2,KI,JC) = CC1(2,KI,J)-CC1(2,KI,JC) |
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32 | 112 CONTINUE |
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33 | 111 END DO |
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34 | DO 118 J=2,IPPH |
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35 | DO 117 KI=1,LID |
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36 | CC1(1,KI,1) = CC1(1,KI,1)+CH1(1,KI,J) |
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37 | CC1(2,KI,1) = CC1(2,KI,1)+CH1(2,KI,J) |
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38 | 117 CONTINUE |
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39 | 118 END DO |
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40 | DO 116 L=2,IPPH |
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41 | LC = IPP2-L |
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42 | DO 113 KI=1,LID |
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43 | CC1(1,KI,L) = CH1(1,KI,1)+WA(1,L-1,1)*CH1(1,KI,2) |
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44 | CC1(1,KI,LC) = -WA(1,L-1,2)*CH1(1,KI,IP) |
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45 | CC1(2,KI,L) = CH1(2,KI,1)+WA(1,L-1,1)*CH1(2,KI,2) |
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46 | CC1(2,KI,LC) = -WA(1,L-1,2)*CH1(2,KI,IP) |
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47 | 113 CONTINUE |
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48 | DO 115 J=3,IPPH |
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49 | JC = IPP2-J |
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50 | IDLJ = MOD((L-1)*(J-1),IP) |
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51 | WAR = WA(1,IDLJ,1) |
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52 | WAI = -WA(1,IDLJ,2) |
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53 | DO 114 KI=1,LID |
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54 | CC1(1,KI,L) = CC1(1,KI,L)+WAR*CH1(1,KI,J) |
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55 | CC1(1,KI,LC) = CC1(1,KI,LC)+WAI*CH1(1,KI,JC) |
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56 | CC1(2,KI,L) = CC1(2,KI,L)+WAR*CH1(2,KI,J) |
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57 | CC1(2,KI,LC) = CC1(2,KI,LC)+WAI*CH1(2,KI,JC) |
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58 | 114 CONTINUE |
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59 | 115 CONTINUE |
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60 | 116 END DO |
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61 | IF (IDO .GT. 1) GO TO 136 |
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62 | SN = 1./REAL(IP*L1) |
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63 | IF (NA .EQ. 1) GO TO 146 |
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64 | DO 149 KI=1,LID |
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65 | CC1(1,KI,1) = SN*CC1(1,KI,1) |
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66 | CC1(2,KI,1) = SN*CC1(2,KI,1) |
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67 | 149 END DO |
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68 | DO 120 J=2,IPPH |
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69 | JC = IPP2-J |
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70 | DO 119 KI=1,LID |
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71 | CHOLD1 = SN*(CC1(1,KI,J)-CC1(2,KI,JC)) |
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72 | CHOLD2 = SN*(CC1(1,KI,J)+CC1(2,KI,JC)) |
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73 | CC1(1,KI,J) = CHOLD1 |
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74 | CC1(2,KI,JC) = SN*(CC1(2,KI,J)-CC1(1,KI,JC)) |
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75 | CC1(2,KI,J) = SN*(CC1(2,KI,J)+CC1(1,KI,JC)) |
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76 | CC1(1,KI,JC) = CHOLD2 |
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77 | 119 CONTINUE |
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78 | 120 END DO |
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79 | RETURN |
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80 | 146 DO 147 KI=1,LID |
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81 | CH1(1,KI,1) = SN*CC1(1,KI,1) |
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82 | CH1(2,KI,1) = SN*CC1(2,KI,1) |
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83 | 147 END DO |
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84 | DO 145 J=2,IPPH |
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85 | JC = IPP2-J |
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86 | DO 144 KI=1,LID |
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87 | CH1(1,KI,J) = SN*(CC1(1,KI,J)-CC1(2,KI,JC)) |
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88 | CH1(2,KI,J) = SN*(CC1(2,KI,J)+CC1(1,KI,JC)) |
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89 | CH1(1,KI,JC) = SN*(CC1(1,KI,J)+CC1(2,KI,JC)) |
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90 | CH1(2,KI,JC) = SN*(CC1(2,KI,J)-CC1(1,KI,JC)) |
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91 | 144 CONTINUE |
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92 | 145 END DO |
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93 | RETURN |
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94 | 136 DO 137 KI=1,LID |
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95 | CH1(1,KI,1) = CC1(1,KI,1) |
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96 | CH1(2,KI,1) = CC1(2,KI,1) |
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97 | 137 END DO |
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98 | DO 135 J=2,IPPH |
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99 | JC = IPP2-J |
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100 | DO 134 KI=1,LID |
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101 | CH1(1,KI,J) = CC1(1,KI,J)-CC1(2,KI,JC) |
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102 | CH1(2,KI,J) = CC1(2,KI,J)+CC1(1,KI,JC) |
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103 | CH1(1,KI,JC) = CC1(1,KI,J)+CC1(2,KI,JC) |
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104 | CH1(2,KI,JC) = CC1(2,KI,J)-CC1(1,KI,JC) |
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105 | 134 CONTINUE |
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106 | 135 END DO |
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107 | DO 131 I=1,IDO |
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108 | DO 130 K=1,L1 |
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109 | CC(1,K,1,I) = CH(1,K,I,1) |
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110 | CC(2,K,1,I) = CH(2,K,I,1) |
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111 | 130 CONTINUE |
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112 | 131 END DO |
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113 | DO 123 J=2,IP |
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114 | DO 122 K=1,L1 |
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115 | CC(1,K,J,1) = CH(1,K,1,J) |
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116 | CC(2,K,J,1) = CH(2,K,1,J) |
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117 | 122 CONTINUE |
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118 | 123 END DO |
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119 | DO 126 J=2,IP |
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120 | DO 125 I=2,IDO |
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121 | DO 124 K=1,L1 |
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122 | CC(1,K,J,I) = WA(I,J-1,1)*CH(1,K,I,J) & |
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123 | & +WA(I,J-1,2)*CH(2,K,I,J) |
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124 | CC(2,K,J,I) = WA(I,J-1,1)*CH(2,K,I,J) & |
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125 | & -WA(I,J-1,2)*CH(1,K,I,J) |
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126 | 124 CONTINUE |
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127 | 125 CONTINUE |
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128 | 126 END DO |
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129 | RETURN |
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130 | END |
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