/wrfv2_fire/external/fftpack/fftpack5/r1f4kf.F
FORTRAN Legacy | 76 lines | 49 code | 1 blank | 26 comment | 0 complexity | 013fc332cd41c275762d72dce1f05fee MD5 | raw file
Possible License(s): AGPL-1.0
- !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
- !
- ! FFTPACK 5.0
- !
- ! Authors: Paul N. Swarztrauber and Richard A. Valent
- !
- ! $Id: r1f4kf.f,v 1.2 2004/06/15 21:29:20 rodney Exp $
- !
- !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
-
- SUBROUTINE R1F4KF (IDO,L1,CC,IN1,CH,IN2,WA1,WA2,WA3)
- REAL CC(IN1,IDO,L1,4) ,CH(IN2,IDO,4,L1) , &
- & WA1(IDO) ,WA2(IDO) ,WA3(IDO)
- !
- HSQT2=SQRT(2.)/2.
- DO 101 K=1,L1
- CH(1,1,1,K) = (CC(1,1,K,2)+CC(1,1,K,4)) &
- & +(CC(1,1,K,1)+CC(1,1,K,3))
- CH(1,IDO,4,K) = (CC(1,1,K,1)+CC(1,1,K,3)) &
- & -(CC(1,1,K,2)+CC(1,1,K,4))
- CH(1,IDO,2,K) = CC(1,1,K,1)-CC(1,1,K,3)
- CH(1,1,3,K) = CC(1,1,K,4)-CC(1,1,K,2)
- 101 END DO
- IF (IDO-2) 107,105,102
- 102 IDP2 = IDO+2
- DO 104 K=1,L1
- DO 103 I=3,IDO,2
- IC = IDP2-I
- CH(1,I-1,1,K) = ((WA1(I-2)*CC(1,I-1,K,2)+WA1(I-1)* &
- & CC(1,I,K,2))+(WA3(I-2)*CC(1,I-1,K,4)+WA3(I-1)* &
- & CC(1,I,K,4)))+(CC(1,I-1,K,1)+(WA2(I-2)*CC(1,I-1,K,3)+ &
- & WA2(I-1)*CC(1,I,K,3)))
- CH(1,IC-1,4,K) = (CC(1,I-1,K,1)+(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))+(WA3(I-2)*CC(1,I-1,K,4)+ &
- & WA3(I-1)*CC(1,I,K,4)))
- CH(1,I,1,K) = ((WA1(I-2)*CC(1,I,K,2)-WA1(I-1)* &
- & CC(1,I-1,K,2))+(WA3(I-2)*CC(1,I,K,4)-WA3(I-1)* &
- & CC(1,I-1,K,4)))+(CC(1,I,K,1)+(WA2(I-2)*CC(1,I,K,3)- &
- & WA2(I-1)*CC(1,I-1,K,3)))
- CH(1,IC,4,K) = ((WA1(I-2)*CC(1,I,K,2)-WA1(I-1)* &
- & CC(1,I-1,K,2))+(WA3(I-2)*CC(1,I,K,4)-WA3(I-1)* &
- & CC(1,I-1,K,4)))-(CC(1,I,K,1)+(WA2(I-2)*CC(1,I,K,3)- &
- & WA2(I-1)*CC(1,I-1,K,3)))
- CH(1,I-1,3,K) = ((WA1(I-2)*CC(1,I,K,2)-WA1(I-1)* &
- & CC(1,I-1,K,2))-(WA3(I-2)*CC(1,I,K,4)-WA3(I-1)* &
- & CC(1,I-1,K,4)))+(CC(1,I-1,K,1)-(WA2(I-2)*CC(1,I-1,K,3)+ &
- & WA2(I-1)*CC(1,I,K,3)))
- CH(1,IC-1,2,K) = (CC(1,I-1,K,1)-(WA2(I-2)*CC(1,I-1,K,3)+ &
- & WA2(I-1)*CC(1,I,K,3)))-((WA1(I-2)*CC(1,I,K,2)-WA1(I-1)* &
- & CC(1,I-1,K,2))-(WA3(I-2)*CC(1,I,K,4)-WA3(I-1)* &
- & CC(1,I-1,K,4)))
- CH(1,I,3,K) = ((WA3(I-2)*CC(1,I-1,K,4)+WA3(I-1)* &
- & CC(1,I,K,4))-(WA1(I-2)*CC(1,I-1,K,2)+WA1(I-1)* &
- & CC(1,I,K,2)))+(CC(1,I,K,1)-(WA2(I-2)*CC(1,I,K,3)- &
- & WA2(I-1)*CC(1,I-1,K,3)))
- CH(1,IC,2,K) = ((WA3(I-2)*CC(1,I-1,K,4)+WA3(I-1)* &
- & CC(1,I,K,4))-(WA1(I-2)*CC(1,I-1,K,2)+WA1(I-1)* &
- & CC(1,I,K,2)))-(CC(1,I,K,1)-(WA2(I-2)*CC(1,I,K,3)- &
- & WA2(I-1)*CC(1,I-1,K,3)))
- 103 CONTINUE
- 104 END DO
- IF (MOD(IDO,2) .EQ. 1) RETURN
- 105 CONTINUE
- DO 106 K=1,L1
- CH(1,IDO,1,K) = (HSQT2*(CC(1,IDO,K,2)-CC(1,IDO,K,4)))+ &
- & CC(1,IDO,K,1)
- CH(1,IDO,3,K) = CC(1,IDO,K,1)-(HSQT2*(CC(1,IDO,K,2)- &
- & CC(1,IDO,K,4)))
- CH(1,1,2,K) = (-HSQT2*(CC(1,IDO,K,2)+CC(1,IDO,K,4)))- &
- & CC(1,IDO,K,3)
- CH(1,1,4,K) = (-HSQT2*(CC(1,IDO,K,2)+CC(1,IDO,K,4)))+ &
- & CC(1,IDO,K,3)
- 106 END DO
- 107 RETURN
- END