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: mradb4.f,v 1.2 2004/06/15 21:29:19 rodney Exp $ |
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8 | ! |
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9 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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10 | |
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11 | SUBROUTINE MRADB4 (M,IDO,L1,CC,IM1,IN1,CH,IM2,IN2,WA1,WA2,WA3) |
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12 | REAL CC(IN1,IDO,4,L1) ,CH(IN2,IDO,L1,4) , & |
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13 | & WA1(IDO) , WA2(IDO) , WA3(IDO) |
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14 | ! |
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15 | M1D = (M-1)*IM1+1 |
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16 | M2S = 1-IM2 |
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17 | SQRT2=SQRT(2.) |
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18 | DO 101 K=1,L1 |
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19 | M2 = M2S |
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20 | DO 1001 M1=1,M1D,IM1 |
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21 | M2 = M2+IM2 |
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22 | CH(M2,1,K,3) = (CC(M1,1,1,K)+CC(M1,IDO,4,K)) & |
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23 | & -(CC(M1,IDO,2,K)+CC(M1,IDO,2,K)) |
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24 | CH(M2,1,K,1) = (CC(M1,1,1,K)+CC(M1,IDO,4,K)) & |
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25 | & +(CC(M1,IDO,2,K)+CC(M1,IDO,2,K)) |
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26 | CH(M2,1,K,4) = (CC(M1,1,1,K)-CC(M1,IDO,4,K)) & |
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27 | & +(CC(M1,1,3,K)+CC(M1,1,3,K)) |
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28 | CH(M2,1,K,2) = (CC(M1,1,1,K)-CC(M1,IDO,4,K)) & |
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29 | & -(CC(M1,1,3,K)+CC(M1,1,3,K)) |
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30 | 1001 CONTINUE |
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31 | 101 END DO |
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32 | IF (IDO-2) 107,105,102 |
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33 | 102 IDP2 = IDO+2 |
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34 | DO 104 K=1,L1 |
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35 | DO 103 I=3,IDO,2 |
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36 | IC = IDP2-I |
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37 | M2 = M2S |
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38 | DO 1002 M1=1,M1D,IM1 |
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39 | M2 = M2+IM2 |
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40 | CH(M2,I-1,K,1) = (CC(M1,I-1,1,K)+CC(M1,IC-1,4,K)) & |
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41 | & +(CC(M1,I-1,3,K)+CC(M1,IC-1,2,K)) |
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42 | CH(M2,I,K,1) = (CC(M1,I,1,K)-CC(M1,IC,4,K)) & |
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43 | & +(CC(M1,I,3,K)-CC(M1,IC,2,K)) |
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44 | CH(M2,I-1,K,2)=WA1(I-2)*((CC(M1,I-1,1,K)-CC(M1,IC-1,4,K)) & |
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45 | & -(CC(M1,I,3,K)+CC(M1,IC,2,K)))-WA1(I-1) & |
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46 | & *((CC(M1,I,1,K)+CC(M1,IC,4,K))+(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K))) |
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47 | CH(M2,I,K,2)=WA1(I-2)*((CC(M1,I,1,K)+CC(M1,IC,4,K)) & |
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48 | & +(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K)))+WA1(I-1) & |
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49 | & *((CC(M1,I-1,1,K)-CC(M1,IC-1,4,K))-(CC(M1,I,3,K)+CC(M1,IC,2,K))) |
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50 | CH(M2,I-1,K,3)=WA2(I-2)*((CC(M1,I-1,1,K)+CC(M1,IC-1,4,K)) & |
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51 | & -(CC(M1,I-1,3,K)+CC(M1,IC-1,2,K)))-WA2(I-1) & |
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52 | & *((CC(M1,I,1,K)-CC(M1,IC,4,K))-(CC(M1,I,3,K)-CC(M1,IC,2,K))) |
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53 | CH(M2,I,K,3)=WA2(I-2)*((CC(M1,I,1,K)-CC(M1,IC,4,K)) & |
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54 | & -(CC(M1,I,3,K)-CC(M1,IC,2,K)))+WA2(I-1) & |
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55 | & *((CC(M1,I-1,1,K)+CC(M1,IC-1,4,K))-(CC(M1,I-1,3,K) & |
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56 | & +CC(M1,IC-1,2,K))) |
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57 | CH(M2,I-1,K,4)=WA3(I-2)*((CC(M1,I-1,1,K)-CC(M1,IC-1,4,K)) & |
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58 | & +(CC(M1,I,3,K)+CC(M1,IC,2,K)))-WA3(I-1) & |
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59 | & *((CC(M1,I,1,K)+CC(M1,IC,4,K))-(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K))) |
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60 | CH(M2,I,K,4)=WA3(I-2)*((CC(M1,I,1,K)+CC(M1,IC,4,K)) & |
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61 | & -(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K)))+WA3(I-1) & |
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62 | & *((CC(M1,I-1,1,K)-CC(M1,IC-1,4,K))+(CC(M1,I,3,K)+CC(M1,IC,2,K))) |
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63 | 1002 CONTINUE |
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64 | 103 CONTINUE |
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65 | 104 END DO |
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66 | IF (MOD(IDO,2) .EQ. 1) RETURN |
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67 | 105 CONTINUE |
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68 | DO 106 K=1,L1 |
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69 | M2 = M2S |
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70 | DO 1003 M1=1,M1D,IM1 |
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71 | M2 = M2+IM2 |
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72 | CH(M2,IDO,K,1) = (CC(M1,IDO,1,K)+CC(M1,IDO,3,K)) & |
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73 | & +(CC(M1,IDO,1,K)+CC(M1,IDO,3,K)) |
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74 | CH(M2,IDO,K,2) = SQRT2*((CC(M1,IDO,1,K)-CC(M1,IDO,3,K)) & |
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75 | & -(CC(M1,1,2,K)+CC(M1,1,4,K))) |
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76 | CH(M2,IDO,K,3) = (CC(M1,1,4,K)-CC(M1,1,2,K)) & |
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77 | & +(CC(M1,1,4,K)-CC(M1,1,2,K)) |
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78 | CH(M2,IDO,K,4) = -SQRT2*((CC(M1,IDO,1,K)-CC(M1,IDO,3,K)) & |
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79 | & +(CC(M1,1,2,K)+CC(M1,1,4,K))) |
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80 | 1003 CONTINUE |
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81 | 106 END DO |
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82 | 107 RETURN |
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83 | END |
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