wrfv2_fire/external/fftpack/fftpack5/c1f4kb.F

   1 !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
   2 !
   3 !   FFTPACK 5.0
   4 !   Copyright (C) 1995-2004, Scientific Computing Division,
   5 !   University Corporation for Atmospheric Research
   6 !   Licensed under the GNU General Public License (GPL)
   7 !
   8 !   Authors:  Paul N. Swarztrauber and Richard A. Valent
   9 !
  10 !   $Id: c1f4kb.f,v 1.2 2004/06/15 21:08:32 rodney Exp $
  11 !
  12 !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
  13
  14       SUBROUTINE C1F4KB (IDO,L1,NA,CC,IN1,CH,IN2,WA)
  15       REAL CC(IN1,L1,IDO,4),CH(IN2,L1,4,IDO),WA(IDO,3,2)
  16 !
  17 ! FFTPACK 5.0 auxiliary routine
  18 !
  19       IF (IDO.GT.1 .OR. NA.EQ.1) GO TO 102
  20       DO 101 K=1,L1
  21          TI1 = CC(2,K,1,1)-CC(2,K,1,3)
  22          TI2 = CC(2,K,1,1)+CC(2,K,1,3)
  23          TR4 = CC(2,K,1,4)-CC(2,K,1,2)
  24          TI3 = CC(2,K,1,2)+CC(2,K,1,4)
  25          TR1 = CC(1,K,1,1)-CC(1,K,1,3)
  26          TR2 = CC(1,K,1,1)+CC(1,K,1,3)
  27          TI4 = CC(1,K,1,2)-CC(1,K,1,4)
  28          TR3 = CC(1,K,1,2)+CC(1,K,1,4)
  29          CC(1,K,1,1) = TR2+TR3
  30          CC(1,K,1,3) = TR2-TR3
  31          CC(2,K,1,1) = TI2+TI3
  32          CC(2,K,1,3) = TI2-TI3
  33          CC(1,K,1,2) = TR1+TR4
  34          CC(1,K,1,4) = TR1-TR4
  35          CC(2,K,1,2) = TI1+TI4
  36          CC(2,K,1,4) = TI1-TI4
  37   101 END DO
  38       RETURN
  39   102 DO 103 K=1,L1
  40          TI1 = CC(2,K,1,1)-CC(2,K,1,3)
  41          TI2 = CC(2,K,1,1)+CC(2,K,1,3)
  42          TR4 = CC(2,K,1,4)-CC(2,K,1,2)
  43          TI3 = CC(2,K,1,2)+CC(2,K,1,4)
  44          TR1 = CC(1,K,1,1)-CC(1,K,1,3)
  45          TR2 = CC(1,K,1,1)+CC(1,K,1,3)
  46          TI4 = CC(1,K,1,2)-CC(1,K,1,4)
  47          TR3 = CC(1,K,1,2)+CC(1,K,1,4)
  48          CH(1,K,1,1) = TR2+TR3
  49          CH(1,K,3,1) = TR2-TR3
  50          CH(2,K,1,1) = TI2+TI3
  51          CH(2,K,3,1) = TI2-TI3
  52          CH(1,K,2,1) = TR1+TR4
  53          CH(1,K,4,1) = TR1-TR4
  54          CH(2,K,2,1) = TI1+TI4
  55          CH(2,K,4,1) = TI1-TI4
  56   103 END DO
  57       IF(IDO .EQ. 1) RETURN
  58       DO 105 I=2,IDO
  59          DO 104 K=1,L1
  60             TI1 = CC(2,K,I,1)-CC(2,K,I,3)
  61             TI2 = CC(2,K,I,1)+CC(2,K,I,3)
  62             TI3 = CC(2,K,I,2)+CC(2,K,I,4)
  63             TR4 = CC(2,K,I,4)-CC(2,K,I,2)
  64             TR1 = CC(1,K,I,1)-CC(1,K,I,3)
  65             TR2 = CC(1,K,I,1)+CC(1,K,I,3)
  66             TI4 = CC(1,K,I,2)-CC(1,K,I,4)
  67             TR3 = CC(1,K,I,2)+CC(1,K,I,4)
  68             CH(1,K,1,I) = TR2+TR3
  69             CR3 = TR2-TR3
  70             CH(2,K,1,I) = TI2+TI3
  71             CI3 = TI2-TI3
  72             CR2 = TR1+TR4
  73             CR4 = TR1-TR4
  74             CI2 = TI1+TI4
  75             CI4 = TI1-TI4
  76             CH(1,K,2,I) = WA(I,1,1)*CR2-WA(I,1,2)*CI2
  77             CH(2,K,2,I) = WA(I,1,1)*CI2+WA(I,1,2)*CR2
  78             CH(1,K,3,I) = WA(I,2,1)*CR3-WA(I,2,2)*CI3
  79             CH(2,K,3,I) = WA(I,2,1)*CI3+WA(I,2,2)*CR3
  80             CH(1,K,4,I) = WA(I,3,1)*CR4-WA(I,3,2)*CI4
  81             CH(2,K,4,I) = WA(I,3,1)*CI4+WA(I,3,2)*CR4
  82   104    CONTINUE
  83   105 END DO
  84       RETURN
  85       END