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[jabaws.git] / website / archive / binaries / mac / src / disembl / Tisean_3.0.1 / source_f / slatec / radf5.f
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-*DECK RADF5
-      SUBROUTINE RADF5 (IDO, L1, CC, CH, WA1, WA2, WA3, WA4)
-C***BEGIN PROLOGUE  RADF5
-C***SUBSIDIARY
-C***PURPOSE  Calculate the fast Fourier transform of subvectors of
-C            length five.
-C***LIBRARY   SLATEC (FFTPACK)
-C***TYPE      SINGLE PRECISION (RADF5-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 variables PI, TI11, TI12,
-C               TR11, TR12 by using FORTRAN intrinsic functions ATAN
-C               and SIN instead of DATA statements.
-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  RADF5
-      DIMENSION CC(IDO,L1,5), CH(IDO,5,*), WA1(*), WA2(*), WA3(*),
-     +          WA4(*)
-C***FIRST EXECUTABLE STATEMENT  RADF5
-      PI = 4.*ATAN(1.)
-      TR11 = SIN(.1*PI)
-      TI11 = SIN(.4*PI)
-      TR12 = -SIN(.3*PI)
-      TI12 = SIN(.2*PI)
-      DO 101 K=1,L1
-         CR2 = CC(1,K,5)+CC(1,K,2)
-         CI5 = CC(1,K,5)-CC(1,K,2)
-         CR3 = CC(1,K,4)+CC(1,K,3)
-         CI4 = CC(1,K,4)-CC(1,K,3)
-         CH(1,1,K) = CC(1,K,1)+CR2+CR3
-         CH(IDO,2,K) = CC(1,K,1)+TR11*CR2+TR12*CR3
-         CH(1,3,K) = TI11*CI5+TI12*CI4
-         CH(IDO,4,K) = CC(1,K,1)+TR12*CR2+TR11*CR3
-         CH(1,5,K) = TI12*CI5-TI11*CI4
-  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)
-            DR4 = WA3(I-2)*CC(I-1,K,4)+WA3(I-1)*CC(I,K,4)
-            DI4 = WA3(I-2)*CC(I,K,4)-WA3(I-1)*CC(I-1,K,4)
-            DR5 = WA4(I-2)*CC(I-1,K,5)+WA4(I-1)*CC(I,K,5)
-            DI5 = WA4(I-2)*CC(I,K,5)-WA4(I-1)*CC(I-1,K,5)
-            CR2 = DR2+DR5
-            CI5 = DR5-DR2
-            CR5 = DI2-DI5
-            CI2 = DI2+DI5
-            CR3 = DR3+DR4
-            CI4 = DR4-DR3
-            CR4 = DI3-DI4
-            CI3 = DI3+DI4
-            CH(I-1,1,K) = CC(I-1,K,1)+CR2+CR3
-            CH(I,1,K) = CC(I,K,1)+CI2+CI3
-            TR2 = CC(I-1,K,1)+TR11*CR2+TR12*CR3
-            TI2 = CC(I,K,1)+TR11*CI2+TR12*CI3
-            TR3 = CC(I-1,K,1)+TR12*CR2+TR11*CR3
-            TI3 = CC(I,K,1)+TR12*CI2+TR11*CI3
-            TR5 = TI11*CR5+TI12*CR4
-            TI5 = TI11*CI5+TI12*CI4
-            TR4 = TI12*CR5-TI11*CR4
-            TI4 = TI12*CI5-TI11*CI4
-            CH(I-1,3,K) = TR2+TR5
-            CH(IC-1,2,K) = TR2-TR5
-            CH(I,3,K) = TI2+TI5
-            CH(IC,2,K) = TI5-TI2
-            CH(I-1,5,K) = TR3+TR4
-            CH(IC-1,4,K) = TR3-TR4
-            CH(I,5,K) = TI3+TI4
-            CH(IC,4,K) = TI4-TI3
-  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)
-            DR4 = WA3(I-2)*CC(I-1,K,4)+WA3(I-1)*CC(I,K,4)
-            DI4 = WA3(I-2)*CC(I,K,4)-WA3(I-1)*CC(I-1,K,4)
-            DR5 = WA4(I-2)*CC(I-1,K,5)+WA4(I-1)*CC(I,K,5)
-            DI5 = WA4(I-2)*CC(I,K,5)-WA4(I-1)*CC(I-1,K,5)
-            CR2 = DR2+DR5
-            CI5 = DR5-DR2
-            CR5 = DI2-DI5
-            CI2 = DI2+DI5
-            CR3 = DR3+DR4
-            CI4 = DR4-DR3
-            CR4 = DI3-DI4
-            CI3 = DI3+DI4
-            CH(I-1,1,K) = CC(I-1,K,1)+CR2+CR3
-            CH(I,1,K) = CC(I,K,1)+CI2+CI3
-            TR2 = CC(I-1,K,1)+TR11*CR2+TR12*CR3
-            TI2 = CC(I,K,1)+TR11*CI2+TR12*CI3
-            TR3 = CC(I-1,K,1)+TR12*CR2+TR11*CR3
-            TI3 = CC(I,K,1)+TR12*CI2+TR11*CI3
-            TR5 = TI11*CR5+TI12*CR4
-            TI5 = TI11*CI5+TI12*CI4
-            TR4 = TI12*CR5-TI11*CR4
-            TI4 = TI12*CI5-TI11*CI4
-            CH(I-1,3,K) = TR2+TR5
-            CH(IC-1,2,K) = TR2-TR5
-            CH(I,3,K) = TI2+TI5
-            CH(IC,2,K) = TI5-TI2
-            CH(I-1,5,K) = TR3+TR4
-            CH(IC-1,4,K) = TR3-TR4
-            CH(I,5,K) = TI3+TI4
-            CH(IC,4,K) = TI4-TI3
-  105    CONTINUE
-  106 CONTINUE
-      RETURN
-      END