+++ /dev/null
-*DECK RADFG
- SUBROUTINE RADFG (IDO, IP, L1, IDL1, CC, C1, C2, CH, CH2, WA)
-C***BEGIN PROLOGUE RADFG
-C***SUBSIDIARY
-C***PURPOSE Calculate the fast Fourier transform of subvectors of
-C arbitrary length.
-C***LIBRARY SLATEC (FFTPACK)
-C***TYPE SINGLE PRECISION (RADFG-S)
-C***AUTHOR Swarztrauber, P. N., (NCAR)
-C***ROUTINES CALLED (NONE)
-C***REVISION HISTORY (YYMMDD)
-C 790601 DATE WRITTEN
-C 830401 Modified to use SLATEC library source file format.
-C 860115 Modified by Ron Boisvert to adhere to Fortran 77 by
-C (a) changing dummy array size declarations (1) to (*),
-C (b) changing references to intrinsic function FLOAT
-C to REAL, and
-C (c) changing definition of variable TPI by using
-C FORTRAN intrinsic function ATAN instead of a DATA
-C statement.
-C 881128 Modified by Dick Valent to meet prologue standards.
-C 890531 Changed all specific intrinsics to generic. (WRB)
-C 890831 Modified array declarations. (WRB)
-C 891214 Prologue converted to Version 4.0 format. (BAB)
-C 900402 Added TYPE section. (WRB)
-C***END PROLOGUE RADFG
- DIMENSION CH(IDO,L1,*), CC(IDO,IP,*), C1(IDO,L1,*),
- + C2(IDL1,*), CH2(IDL1,*), WA(*)
-C***FIRST EXECUTABLE STATEMENT RADFG
- TPI = 8.*ATAN(1.)
- ARG = TPI/IP
- DCP = COS(ARG)
- DSP = SIN(ARG)
- IPPH = (IP+1)/2
- IPP2 = IP+2
- IDP2 = IDO+2
- NBD = (IDO-1)/2
- IF (IDO .EQ. 1) GO TO 119
- DO 101 IK=1,IDL1
- CH2(IK,1) = C2(IK,1)
- 101 CONTINUE
- DO 103 J=2,IP
- DO 102 K=1,L1
- CH(1,K,J) = C1(1,K,J)
- 102 CONTINUE
- 103 CONTINUE
- IF (NBD .GT. L1) GO TO 107
- IS = -IDO
- DO 106 J=2,IP
- IS = IS+IDO
- IDIJ = IS
- DO 105 I=3,IDO,2
- IDIJ = IDIJ+2
- DO 104 K=1,L1
- CH(I-1,K,J) = WA(IDIJ-1)*C1(I-1,K,J)+WA(IDIJ)*C1(I,K,J)
- CH(I,K,J) = WA(IDIJ-1)*C1(I,K,J)-WA(IDIJ)*C1(I-1,K,J)
- 104 CONTINUE
- 105 CONTINUE
- 106 CONTINUE
- GO TO 111
- 107 IS = -IDO
- DO 110 J=2,IP
- IS = IS+IDO
- DO 109 K=1,L1
- IDIJ = IS
-CDIR$ IVDEP
- DO 108 I=3,IDO,2
- IDIJ = IDIJ+2
- CH(I-1,K,J) = WA(IDIJ-1)*C1(I-1,K,J)+WA(IDIJ)*C1(I,K,J)
- CH(I,K,J) = WA(IDIJ-1)*C1(I,K,J)-WA(IDIJ)*C1(I-1,K,J)
- 108 CONTINUE
- 109 CONTINUE
- 110 CONTINUE
- 111 IF (NBD .LT. L1) GO TO 115
- DO 114 J=2,IPPH
- JC = IPP2-J
- DO 113 K=1,L1
-CDIR$ IVDEP
- DO 112 I=3,IDO,2
- C1(I-1,K,J) = CH(I-1,K,J)+CH(I-1,K,JC)
- C1(I-1,K,JC) = CH(I,K,J)-CH(I,K,JC)
- C1(I,K,J) = CH(I,K,J)+CH(I,K,JC)
- C1(I,K,JC) = CH(I-1,K,JC)-CH(I-1,K,J)
- 112 CONTINUE
- 113 CONTINUE
- 114 CONTINUE
- GO TO 121
- 115 DO 118 J=2,IPPH
- JC = IPP2-J
- DO 117 I=3,IDO,2
- DO 116 K=1,L1
- C1(I-1,K,J) = CH(I-1,K,J)+CH(I-1,K,JC)
- C1(I-1,K,JC) = CH(I,K,J)-CH(I,K,JC)
- C1(I,K,J) = CH(I,K,J)+CH(I,K,JC)
- C1(I,K,JC) = CH(I-1,K,JC)-CH(I-1,K,J)
- 116 CONTINUE
- 117 CONTINUE
- 118 CONTINUE
- GO TO 121
- 119 DO 120 IK=1,IDL1
- C2(IK,1) = CH2(IK,1)
- 120 CONTINUE
- 121 DO 123 J=2,IPPH
- JC = IPP2-J
- DO 122 K=1,L1
- C1(1,K,J) = CH(1,K,J)+CH(1,K,JC)
- C1(1,K,JC) = CH(1,K,JC)-CH(1,K,J)
- 122 CONTINUE
- 123 CONTINUE
-C
- AR1 = 1.
- AI1 = 0.
- DO 127 L=2,IPPH
- LC = IPP2-L
- AR1H = DCP*AR1-DSP*AI1
- AI1 = DCP*AI1+DSP*AR1
- AR1 = AR1H
- DO 124 IK=1,IDL1
- CH2(IK,L) = C2(IK,1)+AR1*C2(IK,2)
- CH2(IK,LC) = AI1*C2(IK,IP)
- 124 CONTINUE
- DC2 = AR1
- DS2 = AI1
- AR2 = AR1
- AI2 = AI1
- DO 126 J=3,IPPH
- JC = IPP2-J
- AR2H = DC2*AR2-DS2*AI2
- AI2 = DC2*AI2+DS2*AR2
- AR2 = AR2H
- DO 125 IK=1,IDL1
- CH2(IK,L) = CH2(IK,L)+AR2*C2(IK,J)
- CH2(IK,LC) = CH2(IK,LC)+AI2*C2(IK,JC)
- 125 CONTINUE
- 126 CONTINUE
- 127 CONTINUE
- DO 129 J=2,IPPH
- DO 128 IK=1,IDL1
- CH2(IK,1) = CH2(IK,1)+C2(IK,J)
- 128 CONTINUE
- 129 CONTINUE
-C
- IF (IDO .LT. L1) GO TO 132
- DO 131 K=1,L1
- DO 130 I=1,IDO
- CC(I,1,K) = CH(I,K,1)
- 130 CONTINUE
- 131 CONTINUE
- GO TO 135
- 132 DO 134 I=1,IDO
- DO 133 K=1,L1
- CC(I,1,K) = CH(I,K,1)
- 133 CONTINUE
- 134 CONTINUE
- 135 DO 137 J=2,IPPH
- JC = IPP2-J
- J2 = J+J
- DO 136 K=1,L1
- CC(IDO,J2-2,K) = CH(1,K,J)
- CC(1,J2-1,K) = CH(1,K,JC)
- 136 CONTINUE
- 137 CONTINUE
- IF (IDO .EQ. 1) RETURN
- IF (NBD .LT. L1) GO TO 141
- DO 140 J=2,IPPH
- JC = IPP2-J
- J2 = J+J
- DO 139 K=1,L1
-CDIR$ IVDEP
- DO 138 I=3,IDO,2
- IC = IDP2-I
- CC(I-1,J2-1,K) = CH(I-1,K,J)+CH(I-1,K,JC)
- CC(IC-1,J2-2,K) = CH(I-1,K,J)-CH(I-1,K,JC)
- CC(I,J2-1,K) = CH(I,K,J)+CH(I,K,JC)
- CC(IC,J2-2,K) = CH(I,K,JC)-CH(I,K,J)
- 138 CONTINUE
- 139 CONTINUE
- 140 CONTINUE
- RETURN
- 141 DO 144 J=2,IPPH
- JC = IPP2-J
- J2 = J+J
- DO 143 I=3,IDO,2
- IC = IDP2-I
- DO 142 K=1,L1
- CC(I-1,J2-1,K) = CH(I-1,K,J)+CH(I-1,K,JC)
- CC(IC-1,J2-2,K) = CH(I-1,K,J)-CH(I-1,K,JC)
- CC(I,J2-1,K) = CH(I,K,J)+CH(I,K,JC)
- CC(IC,J2-2,K) = CH(I,K,JC)-CH(I,K,J)
- 142 CONTINUE
- 143 CONTINUE
- 144 CONTINUE
- RETURN
- END
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