wrfv2_fire/external/fftpack/fftpack5/mradf3.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: mradf3.f,v 1.2 2004/06/15 21:29:20 rodney Exp $
  11 !
  12 !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
  13
  14       SUBROUTINE MRADF3 (M,IDO,L1,CC,IM1,IN1,CH,IM2,IN2,WA1,WA2)
  15       REAL       CH(IN2,IDO,3,L1)  ,CC(IN1,IDO,L1,3)     ,              &
  16      &                WA1(IDO)     ,WA2(IDO)
  17 !
  18       M1D = (M-1)*IM1+1
  19       M2S = 1-IM2
  20       ARG=2.*4.*ATAN(1.0)/3.
  21       TAUR=COS(ARG)
  22       TAUI=SIN(ARG)
  23       DO 101 K=1,L1
  24          M2 = M2S
  25          DO 1001 M1=1,M1D,IM1
  26          M2 = M2+IM2
  27          CH(M2,1,1,K) = CC(M1,1,K,1)+(CC(M1,1,K,2)+CC(M1,1,K,3))
  28          CH(M2,1,3,K) = TAUI*(CC(M1,1,K,3)-CC(M1,1,K,2))
  29          CH(M2,IDO,2,K) = CC(M1,1,K,1)+TAUR*                            &
  30      &      (CC(M1,1,K,2)+CC(M1,1,K,3))
  31  1001    CONTINUE
  32   101 END DO
  33       IF (IDO .EQ. 1) RETURN
  34       IDP2 = IDO+2
  35       DO 103 K=1,L1
  36          DO 102 I=3,IDO,2
  37             IC = IDP2-I
  38             M2 = M2S
  39             DO 1002 M1=1,M1D,IM1
  40             M2 = M2+IM2
  41             CH(M2,I-1,1,K) = CC(M1,I-1,K,1)+((WA1(I-2)*CC(M1,I-1,K,2)+  &
  42      &       WA1(I-1)*CC(M1,I,K,2))+(WA2(I-2)*CC(M1,I-1,K,3)+WA2(I-1)*  &
  43      &       CC(M1,I,K,3)))
  44             CH(M2,I,1,K) = CC(M1,I,K,1)+((WA1(I-2)*CC(M1,I,K,2)-        &
  45      &       WA1(I-1)*CC(M1,I-1,K,2))+(WA2(I-2)*CC(M1,I,K,3)-WA2(I-1)*  &
  46      &       CC(M1,I-1,K,3)))
  47             CH(M2,I-1,3,K) = (CC(M1,I-1,K,1)+TAUR*((WA1(I-2)*           &
  48      &       CC(M1,I-1,K,2)+WA1(I-1)*CC(M1,I,K,2))+(WA2(I-2)*           &
  49      &       CC(M1,I-1,K,3)+WA2(I-1)*CC(M1,I,K,3))))+(TAUI*((WA1(I-2)*  &
  50      &       CC(M1,I,K,2)-WA1(I-1)*CC(M1,I-1,K,2))-(WA2(I-2)*           &
  51      &       CC(M1,I,K,3)-WA2(I-1)*CC(M1,I-1,K,3))))
  52             CH(M2,IC-1,2,K) = (CC(M1,I-1,K,1)+TAUR*((WA1(I-2)*          &
  53      &       CC(M1,I-1,K,2)+WA1(I-1)*CC(M1,I,K,2))+(WA2(I-2)*           &
  54      &       CC(M1,I-1,K,3)+WA2(I-1)*CC(M1,I,K,3))))-(TAUI*((WA1(I-2)*  &
  55      &       CC(M1,I,K,2)-WA1(I-1)*CC(M1,I-1,K,2))-(WA2(I-2)*           &
  56      &       CC(M1,I,K,3)-WA2(I-1)*CC(M1,I-1,K,3))))
  57             CH(M2,I,3,K) = (CC(M1,I,K,1)+TAUR*((WA1(I-2)*CC(M1,I,K,2)-  &
  58      &       WA1(I-1)*CC(M1,I-1,K,2))+(WA2(I-2)*CC(M1,I,K,3)-WA2(I-1)*  &
  59      &       CC(M1,I-1,K,3))))+(TAUI*((WA2(I-2)*CC(M1,I-1,K,3)+WA2(I-1)*&
  60      &       CC(M1,I,K,3))-(WA1(I-2)*CC(M1,I-1,K,2)+WA1(I-1)*           &
  61      &       CC(M1,I,K,2))))
  62             CH(M2,IC,2,K) = (TAUI*((WA2(I-2)*CC(M1,I-1,K,3)+WA2(I-1)*   &
  63      &       CC(M1,I,K,3))-(WA1(I-2)*CC(M1,I-1,K,2)+WA1(I-1)*           &
  64      &       CC(M1,I,K,2))))-(CC(M1,I,K,1)+TAUR*((WA1(I-2)*CC(M1,I,K,2)-&
  65      &       WA1(I-1)*CC(M1,I-1,K,2))+(WA2(I-2)*CC(M1,I,K,3)-WA2(I-1)*  &
  66      &       CC(M1,I-1,K,3))))
  67  1002       CONTINUE
  68   102    CONTINUE
  69   103 END DO
  70       RETURN
  71       END