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[jabaws.git] / website / archive / binaries / mac / src / disembl / Tisean_3.0.1 / source_f / slatec / radb5.f
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-*DECK RADB5
-      SUBROUTINE RADB5 (IDO, L1, CC, CH, WA1, WA2, WA3, WA4)
-C***BEGIN PROLOGUE  RADB5
-C***SUBSIDIARY
-C***PURPOSE  Calculate the fast Fourier transform of subvectors of
-C            length five.
-C***LIBRARY   SLATEC (FFTPACK)
-C***TYPE      SINGLE PRECISION (RADB5-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  RADB5
-      DIMENSION CC(IDO,5,*), CH(IDO,L1,5), WA1(*), WA2(*), WA3(*),
-     +          WA4(*)
-C***FIRST EXECUTABLE STATEMENT  RADB5
-      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
-         TI5 = CC(1,3,K)+CC(1,3,K)
-         TI4 = CC(1,5,K)+CC(1,5,K)
-         TR2 = CC(IDO,2,K)+CC(IDO,2,K)
-         TR3 = CC(IDO,4,K)+CC(IDO,4,K)
-         CH(1,K,1) = CC(1,1,K)+TR2+TR3
-         CR2 = CC(1,1,K)+TR11*TR2+TR12*TR3
-         CR3 = CC(1,1,K)+TR12*TR2+TR11*TR3
-         CI5 = TI11*TI5+TI12*TI4
-         CI4 = TI12*TI5-TI11*TI4
-         CH(1,K,2) = CR2-CI5
-         CH(1,K,3) = CR3-CI4
-         CH(1,K,4) = CR3+CI4
-         CH(1,K,5) = CR2+CI5
-  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
-            TI5 = CC(I,3,K)+CC(IC,2,K)
-            TI2 = CC(I,3,K)-CC(IC,2,K)
-            TI4 = CC(I,5,K)+CC(IC,4,K)
-            TI3 = CC(I,5,K)-CC(IC,4,K)
-            TR5 = CC(I-1,3,K)-CC(IC-1,2,K)
-            TR2 = CC(I-1,3,K)+CC(IC-1,2,K)
-            TR4 = CC(I-1,5,K)-CC(IC-1,4,K)
-            TR3 = CC(I-1,5,K)+CC(IC-1,4,K)
-            CH(I-1,K,1) = CC(I-1,1,K)+TR2+TR3
-            CH(I,K,1) = CC(I,1,K)+TI2+TI3
-            CR2 = CC(I-1,1,K)+TR11*TR2+TR12*TR3
-            CI2 = CC(I,1,K)+TR11*TI2+TR12*TI3
-            CR3 = CC(I-1,1,K)+TR12*TR2+TR11*TR3
-            CI3 = CC(I,1,K)+TR12*TI2+TR11*TI3
-            CR5 = TI11*TR5+TI12*TR4
-            CI5 = TI11*TI5+TI12*TI4
-            CR4 = TI12*TR5-TI11*TR4
-            CI4 = TI12*TI5-TI11*TI4
-            DR3 = CR3-CI4
-            DR4 = CR3+CI4
-            DI3 = CI3+CR4
-            DI4 = CI3-CR4
-            DR5 = CR2+CI5
-            DR2 = CR2-CI5
-            DI5 = CI2-CR5
-            DI2 = CI2+CR5
-            CH(I-1,K,2) = WA1(I-2)*DR2-WA1(I-1)*DI2
-            CH(I,K,2) = WA1(I-2)*DI2+WA1(I-1)*DR2
-            CH(I-1,K,3) = WA2(I-2)*DR3-WA2(I-1)*DI3
-            CH(I,K,3) = WA2(I-2)*DI3+WA2(I-1)*DR3
-            CH(I-1,K,4) = WA3(I-2)*DR4-WA3(I-1)*DI4
-            CH(I,K,4) = WA3(I-2)*DI4+WA3(I-1)*DR4
-            CH(I-1,K,5) = WA4(I-2)*DR5-WA4(I-1)*DI5
-            CH(I,K,5) = WA4(I-2)*DI5+WA4(I-1)*DR5
-  102    CONTINUE
-  103 CONTINUE
-      RETURN
-  104 DO 106 I=3,IDO,2
-         IC = IDP2-I
-CDIR$ IVDEP
-         DO 105 K=1,L1
-            TI5 = CC(I,3,K)+CC(IC,2,K)
-            TI2 = CC(I,3,K)-CC(IC,2,K)
-            TI4 = CC(I,5,K)+CC(IC,4,K)
-            TI3 = CC(I,5,K)-CC(IC,4,K)
-            TR5 = CC(I-1,3,K)-CC(IC-1,2,K)
-            TR2 = CC(I-1,3,K)+CC(IC-1,2,K)
-            TR4 = CC(I-1,5,K)-CC(IC-1,4,K)
-            TR3 = CC(I-1,5,K)+CC(IC-1,4,K)
-            CH(I-1,K,1) = CC(I-1,1,K)+TR2+TR3
-            CH(I,K,1) = CC(I,1,K)+TI2+TI3
-            CR2 = CC(I-1,1,K)+TR11*TR2+TR12*TR3
-            CI2 = CC(I,1,K)+TR11*TI2+TR12*TI3
-            CR3 = CC(I-1,1,K)+TR12*TR2+TR11*TR3
-            CI3 = CC(I,1,K)+TR12*TI2+TR11*TI3
-            CR5 = TI11*TR5+TI12*TR4
-            CI5 = TI11*TI5+TI12*TI4
-            CR4 = TI12*TR5-TI11*TR4
-            CI4 = TI12*TI5-TI11*TI4
-            DR3 = CR3-CI4
-            DR4 = CR3+CI4
-            DI3 = CI3+CR4
-            DI4 = CI3-CR4
-            DR5 = CR2+CI5
-            DR2 = CR2-CI5
-            DI5 = CI2-CR5
-            DI2 = CI2+CR5
-            CH(I-1,K,2) = WA1(I-2)*DR2-WA1(I-1)*DI2
-            CH(I,K,2) = WA1(I-2)*DI2+WA1(I-1)*DR2
-            CH(I-1,K,3) = WA2(I-2)*DR3-WA2(I-1)*DI3
-            CH(I,K,3) = WA2(I-2)*DI3+WA2(I-1)*DR3
-            CH(I-1,K,4) = WA3(I-2)*DR4-WA3(I-1)*DI4
-            CH(I,K,4) = WA3(I-2)*DI4+WA3(I-1)*DR4
-            CH(I-1,K,5) = WA4(I-2)*DR5-WA4(I-1)*DI5
-            CH(I,K,5) = WA4(I-2)*DI5+WA4(I-1)*DR5
-  105    CONTINUE
-  106 CONTINUE
-      RETURN
-      END