/wrfv2_fire/external/fftpack/fftpack5/r1f3kf.F
FORTRAN Legacy | 58 lines | 38 code | 1 blank | 19 comment | 0 complexity | 0e3da203d9acdf00f70b286ccc561cbd MD5 | raw file
Possible License(s): AGPL-1.0
- !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
- !
- ! FFTPACK 5.0
- !
- ! Authors: Paul N. Swarztrauber and Richard A. Valent
- !
- ! $Id: r1f3kf.f,v 1.2 2004/06/15 21:29:20 rodney Exp $
- !
- !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
-
- SUBROUTINE R1F3KF (IDO,L1,CC,IN1,CH,IN2,WA1,WA2)
- REAL CH(IN2,IDO,3,L1) ,CC(IN1,IDO,L1,3) , &
- & WA1(IDO) ,WA2(IDO)
- !
- ARG=2.*4.*ATAN(1.0)/3.
- TAUR=COS(ARG)
- TAUI=SIN(ARG)
- DO 101 K=1,L1
- CH(1,1,1,K) = CC(1,1,K,1)+(CC(1,1,K,2)+CC(1,1,K,3))
- CH(1,1,3,K) = TAUI*(CC(1,1,K,3)-CC(1,1,K,2))
- CH(1,IDO,2,K) = CC(1,1,K,1)+TAUR* &
- & (CC(1,1,K,2)+CC(1,1,K,3))
- 101 END DO
- IF (IDO .EQ. 1) RETURN
- IDP2 = IDO+2
- DO 103 K=1,L1
- DO 102 I=3,IDO,2
- IC = IDP2-I
- CH(1,I-1,1,K) = CC(1,I-1,K,1)+((WA1(I-2)*CC(1,I-1,K,2)+ &
- & WA1(I-1)*CC(1,I,K,2))+(WA2(I-2)*CC(1,I-1,K,3)+WA2(I-1)* &
- & CC(1,I,K,3)))
- CH(1,I,1,K) = CC(1,I,K,1)+((WA1(I-2)*CC(1,I,K,2)- &
- & WA1(I-1)*CC(1,I-1,K,2))+(WA2(I-2)*CC(1,I,K,3)-WA2(I-1)* &
- & CC(1,I-1,K,3)))
- CH(1,I-1,3,K) = (CC(1,I-1,K,1)+TAUR*((WA1(I-2)* &
- & CC(1,I-1,K,2)+WA1(I-1)*CC(1,I,K,2))+(WA2(I-2)* &
- & CC(1,I-1,K,3)+WA2(I-1)*CC(1,I,K,3))))+(TAUI*((WA1(I-2)* &
- & CC(1,I,K,2)-WA1(I-1)*CC(1,I-1,K,2))-(WA2(I-2)* &
- & CC(1,I,K,3)-WA2(I-1)*CC(1,I-1,K,3))))
- CH(1,IC-1,2,K) = (CC(1,I-1,K,1)+TAUR*((WA1(I-2)* &
- & CC(1,I-1,K,2)+WA1(I-1)*CC(1,I,K,2))+(WA2(I-2)* &
- & CC(1,I-1,K,3)+WA2(I-1)*CC(1,I,K,3))))-(TAUI*((WA1(I-2)* &
- & CC(1,I,K,2)-WA1(I-1)*CC(1,I-1,K,2))-(WA2(I-2)* &
- & CC(1,I,K,3)-WA2(I-1)*CC(1,I-1,K,3))))
- CH(1,I,3,K) = (CC(1,I,K,1)+TAUR*((WA1(I-2)*CC(1,I,K,2)- &
- & WA1(I-1)*CC(1,I-1,K,2))+(WA2(I-2)*CC(1,I,K,3)-WA2(I-1)* &
- & CC(1,I-1,K,3))))+(TAUI*((WA2(I-2)*CC(1,I-1,K,3)+WA2(I-1)* &
- & CC(1,I,K,3))-(WA1(I-2)*CC(1,I-1,K,2)+WA1(I-1)* &
- & CC(1,I,K,2))))
- CH(1,IC,2,K) = (TAUI*((WA2(I-2)*CC(1,I-1,K,3)+WA2(I-1)* &
- & CC(1,I,K,3))-(WA1(I-2)*CC(1,I-1,K,2)+WA1(I-1)* &
- & CC(1,I,K,2))))-(CC(1,I,K,1)+TAUR*((WA1(I-2)*CC(1,I,K,2)- &
- & WA1(I-1)*CC(1,I-1,K,2))+(WA2(I-2)*CC(1,I,K,3)-WA2(I-1)* &
- & CC(1,I-1,K,3))))
- 102 CONTINUE
- 103 END DO
- RETURN
- END