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: cmf3kb.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 CMF3KB (LOT,IDO,L1,NA,CC,IM1,IN1,CH,IM2,IN2,WA) |
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12 | REAL CC(2,IN1,L1,IDO,3),CH(2,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 | M1D = (LOT-1)*IM1+1 |
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16 | M2S = 1-IM2 |
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17 | IF (IDO.GT.1 .OR. NA.EQ.1) GO TO 102 |
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18 | DO 101 K=1,L1 |
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19 | DO 101 M1=1,M1D,IM1 |
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20 | TR2 = CC(1,M1,K,1,2)+CC(1,M1,K,1,3) |
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21 | CR2 = CC(1,M1,K,1,1)+TAUR*TR2 |
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22 | CC(1,M1,K,1,1) = CC(1,M1,K,1,1)+TR2 |
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23 | TI2 = CC(2,M1,K,1,2)+CC(2,M1,K,1,3) |
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24 | CI2 = CC(2,M1,K,1,1)+TAUR*TI2 |
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25 | CC(2,M1,K,1,1) = CC(2,M1,K,1,1)+TI2 |
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26 | CR3 = TAUI*(CC(1,M1,K,1,2)-CC(1,M1,K,1,3)) |
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27 | CI3 = TAUI*(CC(2,M1,K,1,2)-CC(2,M1,K,1,3)) |
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28 | CC(1,M1,K,1,2) = CR2-CI3 |
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29 | CC(1,M1,K,1,3) = CR2+CI3 |
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30 | CC(2,M1,K,1,2) = CI2+CR3 |
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31 | CC(2,M1,K,1,3) = CI2-CR3 |
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32 | 101 CONTINUE |
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33 | RETURN |
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34 | 102 DO 103 K=1,L1 |
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35 | M2 = M2S |
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36 | DO 103 M1=1,M1D,IM1 |
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37 | M2 = M2+IM2 |
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38 | TR2 = CC(1,M1,K,1,2)+CC(1,M1,K,1,3) |
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39 | CR2 = CC(1,M1,K,1,1)+TAUR*TR2 |
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40 | CH(1,M2,K,1,1) = CC(1,M1,K,1,1)+TR2 |
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41 | TI2 = CC(2,M1,K,1,2)+CC(2,M1,K,1,3) |
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42 | CI2 = CC(2,M1,K,1,1)+TAUR*TI2 |
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43 | CH(2,M2,K,1,1) = CC(2,M1,K,1,1)+TI2 |
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44 | CR3 = TAUI*(CC(1,M1,K,1,2)-CC(1,M1,K,1,3)) |
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45 | CI3 = TAUI*(CC(2,M1,K,1,2)-CC(2,M1,K,1,3)) |
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46 | CH(1,M2,K,2,1) = CR2-CI3 |
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47 | CH(1,M2,K,3,1) = CR2+CI3 |
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48 | CH(2,M2,K,2,1) = CI2+CR3 |
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49 | CH(2,M2,K,3,1) = CI2-CR3 |
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50 | 103 CONTINUE |
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51 | IF (IDO .EQ. 1) RETURN |
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52 | DO 105 I=2,IDO |
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53 | DO 104 K=1,L1 |
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54 | M2 = M2S |
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55 | DO 104 M1=1,M1D,IM1 |
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56 | M2 = M2+IM2 |
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57 | TR2 = CC(1,M1,K,I,2)+CC(1,M1,K,I,3) |
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58 | CR2 = CC(1,M1,K,I,1)+TAUR*TR2 |
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59 | CH(1,M2,K,1,I) = CC(1,M1,K,I,1)+TR2 |
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60 | TI2 = CC(2,M1,K,I,2)+CC(2,M1,K,I,3) |
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61 | CI2 = CC(2,M1,K,I,1)+TAUR*TI2 |
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62 | CH(2,M2,K,1,I) = CC(2,M1,K,I,1)+TI2 |
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63 | CR3 = TAUI*(CC(1,M1,K,I,2)-CC(1,M1,K,I,3)) |
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64 | CI3 = TAUI*(CC(2,M1,K,I,2)-CC(2,M1,K,I,3)) |
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65 | DR2 = CR2-CI3 |
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66 | DR3 = CR2+CI3 |
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67 | DI2 = CI2+CR3 |
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68 | DI3 = CI2-CR3 |
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69 | CH(2,M2,K,2,I) = WA(I,1,1)*DI2+WA(I,1,2)*DR2 |
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70 | CH(1,M2,K,2,I) = WA(I,1,1)*DR2-WA(I,1,2)*DI2 |
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71 | CH(2,M2,K,3,I) = WA(I,2,1)*DI3+WA(I,2,2)*DR3 |
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72 | CH(1,M2,K,3,I) = WA(I,2,1)*DR3-WA(I,2,2)*DI3 |
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73 | 104 CONTINUE |
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74 | 105 END DO |
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75 | RETURN |
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76 | END |
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