| 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: r1f2kf.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 R1F2KF (IDO,L1,CC,IN1,CH,IN2,WA1) |
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| 15 | REAL CH(IN2,IDO,2,L1) ,CC(IN1,IDO,L1,2) , WA1(IDO) |
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| 16 | ! |
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| 17 | DO 101 K=1,L1 |
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| 18 | CH(1,1,1,K) = CC(1,1,K,1)+CC(1,1,K,2) |
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| 19 | CH(1,IDO,2,K) = CC(1,1,K,1)-CC(1,1,K,2) |
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| 20 | 101 END DO |
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| 21 | IF (IDO-2) 107,105,102 |
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| 22 | 102 IDP2 = IDO+2 |
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| 23 | DO 104 K=1,L1 |
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| 24 | DO 103 I=3,IDO,2 |
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| 25 | IC = IDP2-I |
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| 26 | CH(1,I,1,K) = CC(1,I,K,1)+(WA1(I-2)*CC(1,I,K,2)- & |
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| 27 | & WA1(I-1)*CC(1,I-1,K,2)) |
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| 28 | CH(1,IC,2,K) = (WA1(I-2)*CC(1,I,K,2)-WA1(I-1)* & |
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| 29 | & CC(1,I-1,K,2))-CC(1,I,K,1) |
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| 30 | 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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| 31 | & WA1(I-1)*CC(1,I,K,2)) |
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| 32 | CH(1,IC-1,2,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)) |
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| 34 | 103 CONTINUE |
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| 35 | 104 END DO |
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| 36 | IF (MOD(IDO,2) .EQ. 1) RETURN |
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| 37 | 105 DO 106 K=1,L1 |
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| 38 | CH(1,1,2,K) = -CC(1,IDO,K,2) |
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| 39 | CH(1,IDO,1,K) = CC(1,IDO,K,1) |
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| 40 | 106 END DO |
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| 41 | 107 RETURN |
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| 42 | END |
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