!CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC ! ! FFTPACK 5.0 ! ! Authors: Paul N. Swarztrauber and Richard A. Valent ! ! $Id: r1fgkb.f,v 1.2 2004/06/15 21:29:20 rodney Exp $ ! !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC SUBROUTINE R1FGKB (IDO,IP,L1,IDL1,CC,C1,C2,IN1, & & CH,CH2,IN2,WA) REAL CH(IN2,IDO,L1,IP) ,CC(IN1,IDO,IP,L1) , & & C1(IN1,IDO,L1,IP) ,C2(IN1,IDL1,IP), & & CH2(IN2,IDL1,IP) ,WA(IDO) ! TPI=2.*4.*ATAN(1.0) ARG = TPI/FLOAT(IP) DCP = COS(ARG) DSP = SIN(ARG) IDP2 = IDO+2 NBD = (IDO-1)/2 IPP2 = IP+2 IPPH = (IP+1)/2 IF (IDO .LT. L1) GO TO 103 DO 102 K=1,L1 DO 101 I=1,IDO CH(1,I,K,1) = CC(1,I,1,K) 101 CONTINUE 102 END DO GO TO 106 103 DO 105 I=1,IDO DO 104 K=1,L1 CH(1,I,K,1) = CC(1,I,1,K) 104 CONTINUE 105 END DO 106 DO 108 J=2,IPPH JC = IPP2-J J2 = J+J DO 107 K=1,L1 CH(1,1,K,J) = CC(1,IDO,J2-2,K)+CC(1,IDO,J2-2,K) CH(1,1,K,JC) = CC(1,1,J2-1,K)+CC(1,1,J2-1,K) 1007 CONTINUE 107 CONTINUE 108 END DO IF (IDO .EQ. 1) GO TO 116 IF (NBD .LT. L1) GO TO 112 DO 111 J=2,IPPH JC = IPP2-J DO 110 K=1,L1 DO 109 I=3,IDO,2 IC = IDP2-I CH(1,I-1,K,J) = CC(1,I-1,2*J-1,K)+CC(1,IC-1,2*J-2,K) CH(1,I-1,K,JC) = CC(1,I-1,2*J-1,K)-CC(1,IC-1,2*J-2,K) CH(1,I,K,J) = CC(1,I,2*J-1,K)-CC(1,IC,2*J-2,K) CH(1,I,K,JC) = CC(1,I,2*J-1,K)+CC(1,IC,2*J-2,K) 109 CONTINUE 110 CONTINUE 111 END DO GO TO 116 112 DO 115 J=2,IPPH JC = IPP2-J DO 114 I=3,IDO,2 IC = IDP2-I DO 113 K=1,L1 CH(1,I-1,K,J) = CC(1,I-1,2*J-1,K)+CC(1,IC-1,2*J-2,K) CH(1,I-1,K,JC) = CC(1,I-1,2*J-1,K)-CC(1,IC-1,2*J-2,K) CH(1,I,K,J) = CC(1,I,2*J-1,K)-CC(1,IC,2*J-2,K) CH(1,I,K,JC) = CC(1,I,2*J-1,K)+CC(1,IC,2*J-2,K) 113 CONTINUE 114 CONTINUE 115 END DO 116 AR1 = 1. AI1 = 0. DO 120 L=2,IPPH LC = IPP2-L AR1H = DCP*AR1-DSP*AI1 AI1 = DCP*AI1+DSP*AR1 AR1 = AR1H DO 117 IK=1,IDL1 C2(1,IK,L) = CH2(1,IK,1)+AR1*CH2(1,IK,2) C2(1,IK,LC) = AI1*CH2(1,IK,IP) 117 CONTINUE DC2 = AR1 DS2 = AI1 AR2 = AR1 AI2 = AI1 DO 119 J=3,IPPH JC = IPP2-J AR2H = DC2*AR2-DS2*AI2 AI2 = DC2*AI2+DS2*AR2 AR2 = AR2H DO 118 IK=1,IDL1 C2(1,IK,L) = C2(1,IK,L)+AR2*CH2(1,IK,J) C2(1,IK,LC) = C2(1,IK,LC)+AI2*CH2(1,IK,JC) 118 CONTINUE 119 CONTINUE 120 END DO DO 122 J=2,IPPH DO 121 IK=1,IDL1 CH2(1,IK,1) = CH2(1,IK,1)+CH2(1,IK,J) 121 CONTINUE 122 END DO DO 124 J=2,IPPH JC = IPP2-J DO 123 K=1,L1 CH(1,1,K,J) = C1(1,1,K,J)-C1(1,1,K,JC) CH(1,1,K,JC) = C1(1,1,K,J)+C1(1,1,K,JC) 123 CONTINUE 124 END DO IF (IDO .EQ. 1) GO TO 132 IF (NBD .LT. L1) GO TO 128 DO 127 J=2,IPPH JC = IPP2-J DO 126 K=1,L1 DO 125 I=3,IDO,2 CH(1,I-1,K,J) = C1(1,I-1,K,J)-C1(1,I,K,JC) CH(1,I-1,K,JC) = C1(1,I-1,K,J)+C1(1,I,K,JC) CH(1,I,K,J) = C1(1,I,K,J)+C1(1,I-1,K,JC) CH(1,I,K,JC) = C1(1,I,K,J)-C1(1,I-1,K,JC) 125 CONTINUE 126 CONTINUE 127 END DO GO TO 132 128 DO 131 J=2,IPPH JC = IPP2-J DO 130 I=3,IDO,2 DO 129 K=1,L1 CH(1,I-1,K,J) = C1(1,I-1,K,J)-C1(1,I,K,JC) CH(1,I-1,K,JC) = C1(1,I-1,K,J)+C1(1,I,K,JC) CH(1,I,K,J) = C1(1,I,K,J)+C1(1,I-1,K,JC) CH(1,I,K,JC) = C1(1,I,K,J)-C1(1,I-1,K,JC) 129 CONTINUE 130 CONTINUE 131 END DO 132 CONTINUE IF (IDO .EQ. 1) RETURN DO 133 IK=1,IDL1 C2(1,IK,1) = CH2(1,IK,1) 133 END DO DO 135 J=2,IP DO 134 K=1,L1 C1(1,1,K,J) = CH(1,1,K,J) 134 CONTINUE 135 END DO IF (NBD .GT. L1) GO TO 139 IS = -IDO DO 138 J=2,IP IS = IS+IDO IDIJ = IS DO 137 I=3,IDO,2 IDIJ = IDIJ+2 DO 136 K=1,L1 C1(1,I-1,K,J) = WA(IDIJ-1)*CH(1,I-1,K,J)-WA(IDIJ)* & & CH(1,I,K,J) C1(1,I,K,J) = WA(IDIJ-1)*CH(1,I,K,J)+WA(IDIJ)* & & CH(1,I-1,K,J) 136 CONTINUE 137 CONTINUE 138 END DO GO TO 143 139 IS = -IDO DO 142 J=2,IP IS = IS+IDO DO 141 K=1,L1 IDIJ = IS DO 140 I=3,IDO,2 IDIJ = IDIJ+2 C1(1,I-1,K,J) = WA(IDIJ-1)*CH(1,I-1,K,J)-WA(IDIJ)* & & CH(1,I,K,J) C1(1,I,K,J) = WA(IDIJ-1)*CH(1,I,K,J)+WA(IDIJ)* & & CH(1,I-1,K,J) 140 CONTINUE 141 CONTINUE 142 END DO 143 RETURN END