| 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: c1fm1b.f,v 1.2 2004/06/15 21:08:32 rodney Exp $ |
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| 11 | ! |
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| 12 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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| 13 | |
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| 14 | SUBROUTINE C1FM1B (N,INC,C,CH,WA,FNF,FAC) |
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| 15 | COMPLEX C(*) |
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| 16 | REAL CH(*), WA(*), FAC(*) |
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| 17 | ! |
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| 18 | ! FFTPACK 5.0 auxiliary routine |
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| 19 | ! |
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| 20 | INC2 = INC+INC |
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| 21 | NF = FNF |
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| 22 | NA = 0 |
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| 23 | L1 = 1 |
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| 24 | IW = 1 |
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| 25 | DO 125 K1=1,NF |
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| 26 | IP = FAC(K1) |
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| 27 | L2 = IP*L1 |
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| 28 | IDO = N/L2 |
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| 29 | LID = L1*IDO |
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| 30 | NBR = 1+NA+2*MIN(IP-2,4) |
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| 31 | GO TO (52,62,53,63,54,64,55,65,56,66),NBR |
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| 32 | 52 CALL C1F2KB (IDO,L1,NA,C,INC2,CH,2,WA(IW)) |
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| 33 | GO TO 120 |
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| 34 | 62 CALL C1F2KB (IDO,L1,NA,CH,2,C,INC2,WA(IW)) |
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| 35 | GO TO 120 |
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| 36 | 53 CALL C1F3KB (IDO,L1,NA,C,INC2,CH,2,WA(IW)) |
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| 37 | GO TO 120 |
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| 38 | 63 CALL C1F3KB (IDO,L1,NA,CH,2,C,INC2,WA(IW)) |
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| 39 | GO TO 120 |
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| 40 | 54 CALL C1F4KB (IDO,L1,NA,C,INC2,CH,2,WA(IW)) |
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| 41 | GO TO 120 |
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| 42 | 64 CALL C1F4KB (IDO,L1,NA,CH,2,C,INC2,WA(IW)) |
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| 43 | GO TO 120 |
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| 44 | 55 CALL C1F5KB (IDO,L1,NA,C,INC2,CH,2,WA(IW)) |
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| 45 | GO TO 120 |
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| 46 | 65 CALL C1F5KB (IDO,L1,NA,CH,2,C,INC2,WA(IW)) |
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| 47 | GO TO 120 |
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| 48 | 56 CALL C1FGKB (IDO,IP,L1,LID,NA,C,C,INC2,CH,CH,2, & |
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| 49 | & WA(IW)) |
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| 50 | GO TO 120 |
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| 51 | 66 CALL C1FGKB (IDO,IP,L1,LID,NA,CH,CH,2,C,C, & |
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| 52 | & INC2,WA(IW)) |
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| 53 | 120 L1 = L2 |
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| 54 | IW = IW+(IP-1)*(IDO+IDO) |
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| 55 | IF(IP .LE. 5) NA = 1-NA |
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| 56 | 125 END DO |
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| 57 | RETURN |
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| 58 | END |
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