!CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC ! ! FFTPACK 5.0 ! Copyright (C) 1995-2004, Scientific Computing Division, ! University Corporation for Atmospheric Research ! Licensed under the GNU General Public License (GPL) ! ! 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