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: c1f4kf.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 C1F4KF (IDO,L1,NA,CC,IN1,CH,IN2,WA) |
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12 | REAL CC(IN1,L1,IDO,4),CH(IN2,L1,4,IDO),WA(IDO,3,2) |
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13 | ! |
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14 | ! FFTPACK 5.0 auxiliary routine |
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15 | ! |
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16 | IF (IDO .GT. 1) GO TO 102 |
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17 | SN = 1./REAL(4*L1) |
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18 | IF (NA .EQ. 1) GO TO 106 |
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19 | DO 101 K=1,L1 |
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20 | TI1 = CC(2,K,1,1)-CC(2,K,1,3) |
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21 | TI2 = CC(2,K,1,1)+CC(2,K,1,3) |
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22 | TR4 = CC(2,K,1,2)-CC(2,K,1,4) |
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23 | TI3 = CC(2,K,1,2)+CC(2,K,1,4) |
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24 | TR1 = CC(1,K,1,1)-CC(1,K,1,3) |
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25 | TR2 = CC(1,K,1,1)+CC(1,K,1,3) |
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26 | TI4 = CC(1,K,1,4)-CC(1,K,1,2) |
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27 | TR3 = CC(1,K,1,2)+CC(1,K,1,4) |
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28 | CC(1,K,1,1) = SN*(TR2+TR3) |
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29 | CC(1,K,1,3) = SN*(TR2-TR3) |
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30 | CC(2,K,1,1) = SN*(TI2+TI3) |
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31 | CC(2,K,1,3) = SN*(TI2-TI3) |
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32 | CC(1,K,1,2) = SN*(TR1+TR4) |
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33 | CC(1,K,1,4) = SN*(TR1-TR4) |
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34 | CC(2,K,1,2) = SN*(TI1+TI4) |
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35 | CC(2,K,1,4) = SN*(TI1-TI4) |
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36 | 101 END DO |
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37 | RETURN |
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38 | 106 DO 107 K=1,L1 |
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39 | TI1 = CC(2,K,1,1)-CC(2,K,1,3) |
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40 | TI2 = CC(2,K,1,1)+CC(2,K,1,3) |
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41 | TR4 = CC(2,K,1,2)-CC(2,K,1,4) |
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42 | TI3 = CC(2,K,1,2)+CC(2,K,1,4) |
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43 | TR1 = CC(1,K,1,1)-CC(1,K,1,3) |
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44 | TR2 = CC(1,K,1,1)+CC(1,K,1,3) |
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45 | TI4 = CC(1,K,1,4)-CC(1,K,1,2) |
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46 | TR3 = CC(1,K,1,2)+CC(1,K,1,4) |
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47 | CH(1,K,1,1) = SN*(TR2+TR3) |
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48 | CH(1,K,3,1) = SN*(TR2-TR3) |
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49 | CH(2,K,1,1) = SN*(TI2+TI3) |
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50 | CH(2,K,3,1) = SN*(TI2-TI3) |
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51 | CH(1,K,2,1) = SN*(TR1+TR4) |
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52 | CH(1,K,4,1) = SN*(TR1-TR4) |
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53 | CH(2,K,2,1) = SN*(TI1+TI4) |
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54 | CH(2,K,4,1) = SN*(TI1-TI4) |
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55 | 107 END DO |
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56 | RETURN |
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57 | 102 DO 103 K=1,L1 |
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58 | TI1 = CC(2,K,1,1)-CC(2,K,1,3) |
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59 | TI2 = CC(2,K,1,1)+CC(2,K,1,3) |
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60 | TR4 = CC(2,K,1,2)-CC(2,K,1,4) |
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61 | TI3 = CC(2,K,1,2)+CC(2,K,1,4) |
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62 | TR1 = CC(1,K,1,1)-CC(1,K,1,3) |
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63 | TR2 = CC(1,K,1,1)+CC(1,K,1,3) |
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64 | TI4 = CC(1,K,1,4)-CC(1,K,1,2) |
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65 | TR3 = CC(1,K,1,2)+CC(1,K,1,4) |
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66 | CH(1,K,1,1) = TR2+TR3 |
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67 | CH(1,K,3,1) = TR2-TR3 |
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68 | CH(2,K,1,1) = TI2+TI3 |
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69 | CH(2,K,3,1) = TI2-TI3 |
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70 | CH(1,K,2,1) = TR1+TR4 |
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71 | CH(1,K,4,1) = TR1-TR4 |
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72 | CH(2,K,2,1) = TI1+TI4 |
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73 | CH(2,K,4,1) = TI1-TI4 |
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74 | 103 END DO |
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75 | DO 105 I=2,IDO |
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76 | DO 104 K=1,L1 |
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77 | TI1 = CC(2,K,I,1)-CC(2,K,I,3) |
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78 | TI2 = CC(2,K,I,1)+CC(2,K,I,3) |
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79 | TI3 = CC(2,K,I,2)+CC(2,K,I,4) |
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80 | TR4 = CC(2,K,I,2)-CC(2,K,I,4) |
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81 | TR1 = CC(1,K,I,1)-CC(1,K,I,3) |
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82 | TR2 = CC(1,K,I,1)+CC(1,K,I,3) |
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83 | TI4 = CC(1,K,I,4)-CC(1,K,I,2) |
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84 | TR3 = CC(1,K,I,2)+CC(1,K,I,4) |
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85 | CH(1,K,1,I) = TR2+TR3 |
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86 | CR3 = TR2-TR3 |
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87 | CH(2,K,1,I) = TI2+TI3 |
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88 | CI3 = TI2-TI3 |
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89 | CR2 = TR1+TR4 |
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90 | CR4 = TR1-TR4 |
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91 | CI2 = TI1+TI4 |
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92 | CI4 = TI1-TI4 |
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93 | CH(1,K,2,I) = WA(I,1,1)*CR2+WA(I,1,2)*CI2 |
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94 | CH(2,K,2,I) = WA(I,1,1)*CI2-WA(I,1,2)*CR2 |
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95 | CH(1,K,3,I) = WA(I,2,1)*CR3+WA(I,2,2)*CI3 |
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96 | CH(2,K,3,I) = WA(I,2,1)*CI3-WA(I,2,2)*CR3 |
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97 | CH(1,K,4,I) = WA(I,3,1)*CR4+WA(I,3,2)*CI4 |
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98 | CH(2,K,4,I) = WA(I,3,1)*CI4-WA(I,3,2)*CR4 |
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99 | 104 CONTINUE |
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100 | 105 END DO |
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101 | RETURN |
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102 | END |
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