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[jabaws.git] / website / archive / binaries / mac / src / disembl / Tisean_3.0.1 / source_f / slatec / radf4.f

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-*DECK RADF4
-      SUBROUTINE RADF4 (IDO, L1, CC, CH, WA1, WA2, WA3)
-C***BEGIN PROLOGUE  RADF4
-C***SUBSIDIARY
-C***PURPOSE  Calculate the fast Fourier transform of subvectors of
-C            length four.
-C***LIBRARY   SLATEC (FFTPACK)
-C***TYPE      SINGLE PRECISION (RADF4-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 definition of variable HSQT2 by using
-C               FORTRAN intrinsic function SQRT instead of a DATA
-C               statement.
-C   881128  Modified by Dick Valent to meet prologue standards.
-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  RADF4
-      DIMENSION CC(IDO,L1,4), CH(IDO,4,*), WA1(*), WA2(*), WA3(*)
-C***FIRST EXECUTABLE STATEMENT  RADF4
-      HSQT2 = .5*SQRT(2.)
-      DO 101 K=1,L1
-         TR1 = CC(1,K,2)+CC(1,K,4)
-         TR2 = CC(1,K,1)+CC(1,K,3)
-         CH(1,1,K) = TR1+TR2
-         CH(IDO,4,K) = TR2-TR1
-         CH(IDO,2,K) = CC(1,K,1)-CC(1,K,3)
-         CH(1,3,K) = CC(1,K,4)-CC(1,K,2)
-  101 CONTINUE
-      IF (IDO-2) 107,105,102
-  102 IDP2 = IDO+2
-      IF((IDO-1)/2.LT.L1) GO TO 111
-      DO 104 K=1,L1
-CDIR$ IVDEP
-         DO 103 I=3,IDO,2
-            IC = IDP2-I
-            CR2 = WA1(I-2)*CC(I-1,K,2)+WA1(I-1)*CC(I,K,2)
-            CI2 = WA1(I-2)*CC(I,K,2)-WA1(I-1)*CC(I-1,K,2)
-            CR3 = WA2(I-2)*CC(I-1,K,3)+WA2(I-1)*CC(I,K,3)
-            CI3 = WA2(I-2)*CC(I,K,3)-WA2(I-1)*CC(I-1,K,3)
-            CR4 = WA3(I-2)*CC(I-1,K,4)+WA3(I-1)*CC(I,K,4)
-            CI4 = WA3(I-2)*CC(I,K,4)-WA3(I-1)*CC(I-1,K,4)
-            TR1 = CR2+CR4
-            TR4 = CR4-CR2
-            TI1 = CI2+CI4
-            TI4 = CI2-CI4
-            TI2 = CC(I,K,1)+CI3
-            TI3 = CC(I,K,1)-CI3
-            TR2 = CC(I-1,K,1)+CR3
-            TR3 = CC(I-1,K,1)-CR3
-            CH(I-1,1,K) = TR1+TR2
-            CH(IC-1,4,K) = TR2-TR1
-            CH(I,1,K) = TI1+TI2
-            CH(IC,4,K) = TI1-TI2
-            CH(I-1,3,K) = TI4+TR3
-            CH(IC-1,2,K) = TR3-TI4
-            CH(I,3,K) = TR4+TI3
-            CH(IC,2,K) = TR4-TI3
-  103    CONTINUE
-  104 CONTINUE
-      GO TO 110
-  111 DO 109 I=3,IDO,2
-         IC = IDP2-I
-CDIR$ IVDEP
-         DO 108 K=1,L1
-            CR2 = WA1(I-2)*CC(I-1,K,2)+WA1(I-1)*CC(I,K,2)
-            CI2 = WA1(I-2)*CC(I,K,2)-WA1(I-1)*CC(I-1,K,2)
-            CR3 = WA2(I-2)*CC(I-1,K,3)+WA2(I-1)*CC(I,K,3)
-            CI3 = WA2(I-2)*CC(I,K,3)-WA2(I-1)*CC(I-1,K,3)
-            CR4 = WA3(I-2)*CC(I-1,K,4)+WA3(I-1)*CC(I,K,4)
-            CI4 = WA3(I-2)*CC(I,K,4)-WA3(I-1)*CC(I-1,K,4)
-            TR1 = CR2+CR4
-            TR4 = CR4-CR2
-            TI1 = CI2+CI4
-            TI4 = CI2-CI4
-            TI2 = CC(I,K,1)+CI3
-            TI3 = CC(I,K,1)-CI3
-            TR2 = CC(I-1,K,1)+CR3
-            TR3 = CC(I-1,K,1)-CR3
-            CH(I-1,1,K) = TR1+TR2
-            CH(IC-1,4,K) = TR2-TR1
-            CH(I,1,K) = TI1+TI2
-            CH(IC,4,K) = TI1-TI2
-            CH(I-1,3,K) = TI4+TR3
-            CH(IC-1,2,K) = TR3-TI4
-            CH(I,3,K) = TR4+TI3
-            CH(IC,2,K) = TR4-TI3
-  108    CONTINUE
-  109 CONTINUE
-  110 IF (MOD(IDO,2) .EQ. 1) RETURN
-  105 DO 106 K=1,L1
-         TI1 = -HSQT2*(CC(IDO,K,2)+CC(IDO,K,4))
-         TR1 = HSQT2*(CC(IDO,K,2)-CC(IDO,K,4))
-         CH(IDO,1,K) = TR1+CC(IDO,K,1)
-         CH(IDO,3,K) = CC(IDO,K,1)-TR1
-         CH(1,2,K) = TI1-CC(IDO,K,3)
-         CH(1,4,K) = TI1+CC(IDO,K,3)
-  106 CONTINUE
-  107 RETURN
-      END