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: c1f3kf.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 C1F3KF (IDO,L1,NA,CC,IN1,CH,IN2,WA) |
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12 | REAL CC(IN1,L1,IDO,3),CH(IN2,L1,3,IDO),WA(IDO,2,2) |
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13 | DATA TAUR,TAUI /-.5,-.866025403784439/ |
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14 | ! |
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15 | IF (IDO .GT. 1) GO TO 102 |
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16 | SN = 1./REAL(3*L1) |
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17 | IF (NA .EQ. 1) GO TO 106 |
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18 | DO 101 K=1,L1 |
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19 | TR2 = CC(1,K,1,2)+CC(1,K,1,3) |
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20 | CR2 = CC(1,K,1,1)+TAUR*TR2 |
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21 | CC(1,K,1,1) = SN*(CC(1,K,1,1)+TR2) |
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22 | TI2 = CC(2,K,1,2)+CC(2,K,1,3) |
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23 | CI2 = CC(2,K,1,1)+TAUR*TI2 |
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24 | CC(2,K,1,1) = SN*(CC(2,K,1,1)+TI2) |
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25 | CR3 = TAUI*(CC(1,K,1,2)-CC(1,K,1,3)) |
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26 | CI3 = TAUI*(CC(2,K,1,2)-CC(2,K,1,3)) |
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27 | CC(1,K,1,2) = SN*(CR2-CI3) |
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28 | CC(1,K,1,3) = SN*(CR2+CI3) |
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29 | CC(2,K,1,2) = SN*(CI2+CR3) |
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30 | CC(2,K,1,3) = SN*(CI2-CR3) |
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31 | 101 END DO |
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32 | RETURN |
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33 | 106 DO 107 K=1,L1 |
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34 | TR2 = CC(1,K,1,2)+CC(1,K,1,3) |
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35 | CR2 = CC(1,K,1,1)+TAUR*TR2 |
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36 | CH(1,K,1,1) = SN*(CC(1,K,1,1)+TR2) |
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37 | TI2 = CC(2,K,1,2)+CC(2,K,1,3) |
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38 | CI2 = CC(2,K,1,1)+TAUR*TI2 |
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39 | CH(2,K,1,1) = SN*(CC(2,K,1,1)+TI2) |
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40 | CR3 = TAUI*(CC(1,K,1,2)-CC(1,K,1,3)) |
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41 | CI3 = TAUI*(CC(2,K,1,2)-CC(2,K,1,3)) |
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42 | CH(1,K,2,1) = SN*(CR2-CI3) |
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43 | CH(1,K,3,1) = SN*(CR2+CI3) |
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44 | CH(2,K,2,1) = SN*(CI2+CR3) |
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45 | CH(2,K,3,1) = SN*(CI2-CR3) |
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46 | 107 END DO |
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47 | RETURN |
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48 | 102 DO 103 K=1,L1 |
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49 | TR2 = CC(1,K,1,2)+CC(1,K,1,3) |
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50 | CR2 = CC(1,K,1,1)+TAUR*TR2 |
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51 | CH(1,K,1,1) = CC(1,K,1,1)+TR2 |
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52 | TI2 = CC(2,K,1,2)+CC(2,K,1,3) |
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53 | CI2 = CC(2,K,1,1)+TAUR*TI2 |
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54 | CH(2,K,1,1) = CC(2,K,1,1)+TI2 |
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55 | CR3 = TAUI*(CC(1,K,1,2)-CC(1,K,1,3)) |
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56 | CI3 = TAUI*(CC(2,K,1,2)-CC(2,K,1,3)) |
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57 | CH(1,K,2,1) = CR2-CI3 |
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58 | CH(1,K,3,1) = CR2+CI3 |
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59 | CH(2,K,2,1) = CI2+CR3 |
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60 | CH(2,K,3,1) = CI2-CR3 |
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61 | 103 END DO |
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62 | DO 105 I=2,IDO |
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63 | DO 104 K=1,L1 |
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64 | TR2 = CC(1,K,I,2)+CC(1,K,I,3) |
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65 | CR2 = CC(1,K,I,1)+TAUR*TR2 |
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66 | CH(1,K,1,I) = CC(1,K,I,1)+TR2 |
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67 | TI2 = CC(2,K,I,2)+CC(2,K,I,3) |
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68 | CI2 = CC(2,K,I,1)+TAUR*TI2 |
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69 | CH(2,K,1,I) = CC(2,K,I,1)+TI2 |
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70 | CR3 = TAUI*(CC(1,K,I,2)-CC(1,K,I,3)) |
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71 | CI3 = TAUI*(CC(2,K,I,2)-CC(2,K,I,3)) |
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72 | DR2 = CR2-CI3 |
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73 | DR3 = CR2+CI3 |
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74 | DI2 = CI2+CR3 |
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75 | DI3 = CI2-CR3 |
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76 | CH(2,K,2,I) = WA(I,1,1)*DI2-WA(I,1,2)*DR2 |
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77 | CH(1,K,2,I) = WA(I,1,1)*DR2+WA(I,1,2)*DI2 |
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78 | CH(2,K,3,I) = WA(I,2,1)*DI3-WA(I,2,2)*DR3 |
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79 | CH(1,K,3,I) = WA(I,2,1)*DR3+WA(I,2,2)*DI3 |
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80 | 104 CONTINUE |
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81 | 105 END DO |
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82 | RETURN |
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83 | END |
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