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[jabaws.git] / website / archive / binaries / mac / src / disembl / Tisean_3.0.1 / source_f / slatec / radf3.f
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-*DECK RADF3
-      SUBROUTINE RADF3 (IDO, L1, CC, CH, WA1, WA2)
-C***BEGIN PROLOGUE  RADF3
-C***SUBSIDIARY
-C***PURPOSE  Calculate the fast Fourier transform of subvectors of
-C            length three.
-C***LIBRARY   SLATEC (FFTPACK)
-C***TYPE      SINGLE PRECISION (RADF3-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 TAUI 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  RADF3
-      DIMENSION CH(IDO,3,*), CC(IDO,L1,3), WA1(*), WA2(*)
-C***FIRST EXECUTABLE STATEMENT  RADF3
-      TAUR = -.5
-      TAUI = .5*SQRT(3.)
-      DO 101 K=1,L1
-         CR2 = CC(1,K,2)+CC(1,K,3)
-         CH(1,1,K) = CC(1,K,1)+CR2
-         CH(1,3,K) = TAUI*(CC(1,K,3)-CC(1,K,2))
-         CH(IDO,2,K) = CC(1,K,1)+TAUR*CR2
-  101 CONTINUE
-      IF (IDO .EQ. 1) RETURN
-      IDP2 = IDO+2
-      IF((IDO-1)/2.LT.L1) GO TO 104
-      DO 103 K=1,L1
-CDIR$ IVDEP
-         DO 102 I=3,IDO,2
-            IC = IDP2-I
-            DR2 = WA1(I-2)*CC(I-1,K,2)+WA1(I-1)*CC(I,K,2)
-            DI2 = WA1(I-2)*CC(I,K,2)-WA1(I-1)*CC(I-1,K,2)
-            DR3 = WA2(I-2)*CC(I-1,K,3)+WA2(I-1)*CC(I,K,3)
-            DI3 = WA2(I-2)*CC(I,K,3)-WA2(I-1)*CC(I-1,K,3)
-            CR2 = DR2+DR3
-            CI2 = DI2+DI3
-            CH(I-1,1,K) = CC(I-1,K,1)+CR2
-            CH(I,1,K) = CC(I,K,1)+CI2
-            TR2 = CC(I-1,K,1)+TAUR*CR2
-            TI2 = CC(I,K,1)+TAUR*CI2
-            TR3 = TAUI*(DI2-DI3)
-            TI3 = TAUI*(DR3-DR2)
-            CH(I-1,3,K) = TR2+TR3
-            CH(IC-1,2,K) = TR2-TR3
-            CH(I,3,K) = TI2+TI3
-            CH(IC,2,K) = TI3-TI2
-  102    CONTINUE
-  103 CONTINUE
-      RETURN
-  104 DO 106 I=3,IDO,2
-         IC = IDP2-I
-CDIR$ IVDEP
-         DO 105 K=1,L1
-            DR2 = WA1(I-2)*CC(I-1,K,2)+WA1(I-1)*CC(I,K,2)
-            DI2 = WA1(I-2)*CC(I,K,2)-WA1(I-1)*CC(I-1,K,2)
-            DR3 = WA2(I-2)*CC(I-1,K,3)+WA2(I-1)*CC(I,K,3)
-            DI3 = WA2(I-2)*CC(I,K,3)-WA2(I-1)*CC(I-1,K,3)
-            CR2 = DR2+DR3
-            CI2 = DI2+DI3
-            CH(I-1,1,K) = CC(I-1,K,1)+CR2
-            CH(I,1,K) = CC(I,K,1)+CI2
-            TR2 = CC(I-1,K,1)+TAUR*CR2
-            TI2 = CC(I,K,1)+TAUR*CI2
-            TR3 = TAUI*(DI2-DI3)
-            TI3 = TAUI*(DR3-DR2)
-            CH(I-1,3,K) = TR2+TR3
-            CH(IC-1,2,K) = TR2-TR3
-            CH(I,3,K) = TI2+TI3
-            CH(IC,2,K) = TI3-TI2
-  105    CONTINUE
-  106 CONTINUE
-      RETURN
-      END