!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: r1f4kb.f,v 1.2 2004/06/15 21:29:20 rodney Exp $ ! !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC SUBROUTINE R1F4KB (IDO,L1,CC,IN1,CH,IN2,WA1,WA2,WA3) REAL CC(IN1,IDO,4,L1) ,CH(IN2,IDO,L1,4) , & & WA1(IDO) , WA2(IDO) , WA3(IDO) ! SQRT2=SQRT(2.) DO 101 K=1,L1 CH(1,1,K,3) = (CC(1,1,1,K)+CC(1,IDO,4,K)) & & -(CC(1,IDO,2,K)+CC(1,IDO,2,K)) CH(1,1,K,1) = (CC(1,1,1,K)+CC(1,IDO,4,K)) & & +(CC(1,IDO,2,K)+CC(1,IDO,2,K)) CH(1,1,K,4) = (CC(1,1,1,K)-CC(1,IDO,4,K)) & & +(CC(1,1,3,K)+CC(1,1,3,K)) CH(1,1,K,2) = (CC(1,1,1,K)-CC(1,IDO,4,K)) & & -(CC(1,1,3,K)+CC(1,1,3,K)) 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,K,1) = (CC(1,I-1,1,K)+CC(1,IC-1,4,K)) & & +(CC(1,I-1,3,K)+CC(1,IC-1,2,K)) CH(1,I,K,1) = (CC(1,I,1,K)-CC(1,IC,4,K)) & & +(CC(1,I,3,K)-CC(1,IC,2,K)) CH(1,I-1,K,2)=WA1(I-2)*((CC(1,I-1,1,K)-CC(1,IC-1,4,K)) & & -(CC(1,I,3,K)+CC(1,IC,2,K)))-WA1(I-1) & & *((CC(1,I,1,K)+CC(1,IC,4,K))+(CC(1,I-1,3,K)-CC(1,IC-1,2,K))) CH(1,I,K,2)=WA1(I-2)*((CC(1,I,1,K)+CC(1,IC,4,K)) & & +(CC(1,I-1,3,K)-CC(1,IC-1,2,K)))+WA1(I-1) & & *((CC(1,I-1,1,K)-CC(1,IC-1,4,K))-(CC(1,I,3,K)+CC(1,IC,2,K))) CH(1,I-1,K,3)=WA2(I-2)*((CC(1,I-1,1,K)+CC(1,IC-1,4,K)) & & -(CC(1,I-1,3,K)+CC(1,IC-1,2,K)))-WA2(I-1) & & *((CC(1,I,1,K)-CC(1,IC,4,K))-(CC(1,I,3,K)-CC(1,IC,2,K))) CH(1,I,K,3)=WA2(I-2)*((CC(1,I,1,K)-CC(1,IC,4,K)) & & -(CC(1,I,3,K)-CC(1,IC,2,K)))+WA2(I-1) & & *((CC(1,I-1,1,K)+CC(1,IC-1,4,K))-(CC(1,I-1,3,K) & & +CC(1,IC-1,2,K))) CH(1,I-1,K,4)=WA3(I-2)*((CC(1,I-1,1,K)-CC(1,IC-1,4,K)) & & +(CC(1,I,3,K)+CC(1,IC,2,K)))-WA3(I-1) & & *((CC(1,I,1,K)+CC(1,IC,4,K))-(CC(1,I-1,3,K)-CC(1,IC-1,2,K))) CH(1,I,K,4)=WA3(I-2)*((CC(1,I,1,K)+CC(1,IC,4,K)) & & -(CC(1,I-1,3,K)-CC(1,IC-1,2,K)))+WA3(I-1) & & *((CC(1,I-1,1,K)-CC(1,IC-1,4,K))+(CC(1,I,3,K)+CC(1,IC,2,K))) 103 CONTINUE 104 END DO IF (MOD(IDO,2) .EQ. 1) RETURN 105 CONTINUE DO 106 K=1,L1 CH(1,IDO,K,1) = (CC(1,IDO,1,K)+CC(1,IDO,3,K)) & & +(CC(1,IDO,1,K)+CC(1,IDO,3,K)) CH(1,IDO,K,2) = SQRT2*((CC(1,IDO,1,K)-CC(1,IDO,3,K)) & & -(CC(1,1,2,K)+CC(1,1,4,K))) CH(1,IDO,K,3) = (CC(1,1,4,K)-CC(1,1,2,K)) & & +(CC(1,1,4,K)-CC(1,1,2,K)) CH(1,IDO,K,4) = -SQRT2*((CC(1,IDO,1,K)-CC(1,IDO,3,K)) & & +(CC(1,1,2,K)+CC(1,1,4,K))) 106 END DO 107 RETURN END