| 1 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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| 2 | ! |
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| 3 | ! FFTPACK 5.0 |
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| 4 | ! Copyright (C) 1995-2004, Scientific Computing Division, |
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| 5 | ! University Corporation for Atmospheric Research |
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| 6 | ! Licensed under the GNU General Public License (GPL) |
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| 7 | ! |
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| 8 | ! Authors: Paul N. Swarztrauber and Richard A. Valent |
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| 9 | ! |
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| 10 | ! $Id: r1f3kf.f,v 1.2 2004/06/15 21:29:20 rodney Exp $ |
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| 11 | ! |
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| 12 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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| 13 | |
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| 14 | SUBROUTINE R1F3KF (IDO,L1,CC,IN1,CH,IN2,WA1,WA2) |
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| 15 | REAL CH(IN2,IDO,3,L1) ,CC(IN1,IDO,L1,3) , & |
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| 16 | & WA1(IDO) ,WA2(IDO) |
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| 17 | ! |
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| 18 | ARG=2.*4.*ATAN(1.0)/3. |
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| 19 | TAUR=COS(ARG) |
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| 20 | TAUI=SIN(ARG) |
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| 21 | DO 101 K=1,L1 |
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| 22 | CH(1,1,1,K) = CC(1,1,K,1)+(CC(1,1,K,2)+CC(1,1,K,3)) |
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| 23 | CH(1,1,3,K) = TAUI*(CC(1,1,K,3)-CC(1,1,K,2)) |
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| 24 | CH(1,IDO,2,K) = CC(1,1,K,1)+TAUR* & |
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| 25 | & (CC(1,1,K,2)+CC(1,1,K,3)) |
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| 26 | 101 END DO |
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| 27 | IF (IDO .EQ. 1) RETURN |
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| 28 | IDP2 = IDO+2 |
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| 29 | DO 103 K=1,L1 |
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| 30 | DO 102 I=3,IDO,2 |
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| 31 | IC = IDP2-I |
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| 32 | CH(1,I-1,1,K) = CC(1,I-1,K,1)+((WA1(I-2)*CC(1,I-1,K,2)+ & |
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| 33 | & WA1(I-1)*CC(1,I,K,2))+(WA2(I-2)*CC(1,I-1,K,3)+WA2(I-1)* & |
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| 34 | & CC(1,I,K,3))) |
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| 35 | CH(1,I,1,K) = CC(1,I,K,1)+((WA1(I-2)*CC(1,I,K,2)- & |
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| 36 | & WA1(I-1)*CC(1,I-1,K,2))+(WA2(I-2)*CC(1,I,K,3)-WA2(I-1)* & |
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| 37 | & CC(1,I-1,K,3))) |
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| 38 | CH(1,I-1,3,K) = (CC(1,I-1,K,1)+TAUR*((WA1(I-2)* & |
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| 39 | & CC(1,I-1,K,2)+WA1(I-1)*CC(1,I,K,2))+(WA2(I-2)* & |
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| 40 | & CC(1,I-1,K,3)+WA2(I-1)*CC(1,I,K,3))))+(TAUI*((WA1(I-2)* & |
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| 41 | & CC(1,I,K,2)-WA1(I-1)*CC(1,I-1,K,2))-(WA2(I-2)* & |
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| 42 | & CC(1,I,K,3)-WA2(I-1)*CC(1,I-1,K,3)))) |
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| 43 | CH(1,IC-1,2,K) = (CC(1,I-1,K,1)+TAUR*((WA1(I-2)* & |
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| 44 | & CC(1,I-1,K,2)+WA1(I-1)*CC(1,I,K,2))+(WA2(I-2)* & |
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| 45 | & CC(1,I-1,K,3)+WA2(I-1)*CC(1,I,K,3))))-(TAUI*((WA1(I-2)* & |
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| 46 | & CC(1,I,K,2)-WA1(I-1)*CC(1,I-1,K,2))-(WA2(I-2)* & |
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| 47 | & CC(1,I,K,3)-WA2(I-1)*CC(1,I-1,K,3)))) |
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| 48 | CH(1,I,3,K) = (CC(1,I,K,1)+TAUR*((WA1(I-2)*CC(1,I,K,2)- & |
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| 49 | & WA1(I-1)*CC(1,I-1,K,2))+(WA2(I-2)*CC(1,I,K,3)-WA2(I-1)* & |
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| 50 | & CC(1,I-1,K,3))))+(TAUI*((WA2(I-2)*CC(1,I-1,K,3)+WA2(I-1)* & |
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| 51 | & CC(1,I,K,3))-(WA1(I-2)*CC(1,I-1,K,2)+WA1(I-1)* & |
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| 52 | & CC(1,I,K,2)))) |
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| 53 | CH(1,IC,2,K) = (TAUI*((WA2(I-2)*CC(1,I-1,K,3)+WA2(I-1)* & |
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| 54 | & CC(1,I,K,3))-(WA1(I-2)*CC(1,I-1,K,2)+WA1(I-1)* & |
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| 55 | & CC(1,I,K,2))))-(CC(1,I,K,1)+TAUR*((WA1(I-2)*CC(1,I,K,2)- & |
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| 56 | & WA1(I-1)*CC(1,I-1,K,2))+(WA2(I-2)*CC(1,I,K,3)-WA2(I-1)* & |
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| 57 | & CC(1,I-1,K,3)))) |
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| 58 | 102 CONTINUE |
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| 59 | 103 END DO |
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| 60 | RETURN |
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| 61 | END |
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