Mac binaries

[jabaws.git] / website / archive / binaries / mac / src / disembl / Tisean_3.0.1 / source_f / slatec / radb4.f

diff --git a/website/archive/binaries/mac/src/disembl/Tisean_3.0.1/source_f/slatec/radb4.f b/website/archive/binaries/mac/src/disembl/Tisean_3.0.1/source_f/slatec/radb4.f
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+*DECK RADB4
+      SUBROUTINE RADB4 (IDO, L1, CC, CH, WA1, WA2, WA3)
+C***BEGIN PROLOGUE  RADB4
+C***SUBSIDIARY
+C***PURPOSE  Calculate the fast Fourier transform of subvectors of
+C            length four.
+C***LIBRARY   SLATEC (FFTPACK)
+C***TYPE      SINGLE PRECISION (RADB4-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 SQRT2 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  RADB4
+      DIMENSION CC(IDO,4,*), CH(IDO,L1,4), WA1(*), WA2(*), WA3(*)
+C***FIRST EXECUTABLE STATEMENT  RADB4
+      SQRT2 = SQRT(2.)
+      DO 101 K=1,L1
+         TR1 = CC(1,1,K)-CC(IDO,4,K)
+         TR2 = CC(1,1,K)+CC(IDO,4,K)
+         TR3 = CC(IDO,2,K)+CC(IDO,2,K)
+         TR4 = CC(1,3,K)+CC(1,3,K)
+         CH(1,K,1) = TR2+TR3
+         CH(1,K,2) = TR1-TR4
+         CH(1,K,3) = TR2-TR3
+         CH(1,K,4) = TR1+TR4
+  101 CONTINUE
+      IF (IDO-2) 107,105,102
+  102 IDP2 = IDO+2
+      IF((IDO-1)/2.LT.L1) GO TO 108
+      DO 104 K=1,L1
+CDIR$ IVDEP
+         DO 103 I=3,IDO,2
+            IC = IDP2-I
+            TI1 = CC(I,1,K)+CC(IC,4,K)
+            TI2 = CC(I,1,K)-CC(IC,4,K)
+            TI3 = CC(I,3,K)-CC(IC,2,K)
+            TR4 = CC(I,3,K)+CC(IC,2,K)
+            TR1 = CC(I-1,1,K)-CC(IC-1,4,K)
+            TR2 = CC(I-1,1,K)+CC(IC-1,4,K)
+            TI4 = CC(I-1,3,K)-CC(IC-1,2,K)
+            TR3 = CC(I-1,3,K)+CC(IC-1,2,K)
+            CH(I-1,K,1) = TR2+TR3
+            CR3 = TR2-TR3
+            CH(I,K,1) = TI2+TI3
+            CI3 = TI2-TI3
+            CR2 = TR1-TR4
+            CR4 = TR1+TR4
+            CI2 = TI1+TI4
+            CI4 = TI1-TI4
+            CH(I-1,K,2) = WA1(I-2)*CR2-WA1(I-1)*CI2
+            CH(I,K,2) = WA1(I-2)*CI2+WA1(I-1)*CR2
+            CH(I-1,K,3) = WA2(I-2)*CR3-WA2(I-1)*CI3
+            CH(I,K,3) = WA2(I-2)*CI3+WA2(I-1)*CR3
+            CH(I-1,K,4) = WA3(I-2)*CR4-WA3(I-1)*CI4
+            CH(I,K,4) = WA3(I-2)*CI4+WA3(I-1)*CR4
+  103    CONTINUE
+  104 CONTINUE
+      GO TO 111
+  108 DO 110 I=3,IDO,2
+         IC = IDP2-I
+CDIR$ IVDEP
+         DO 109 K=1,L1
+            TI1 = CC(I,1,K)+CC(IC,4,K)
+            TI2 = CC(I,1,K)-CC(IC,4,K)
+            TI3 = CC(I,3,K)-CC(IC,2,K)
+            TR4 = CC(I,3,K)+CC(IC,2,K)
+            TR1 = CC(I-1,1,K)-CC(IC-1,4,K)
+            TR2 = CC(I-1,1,K)+CC(IC-1,4,K)
+            TI4 = CC(I-1,3,K)-CC(IC-1,2,K)
+            TR3 = CC(I-1,3,K)+CC(IC-1,2,K)
+            CH(I-1,K,1) = TR2+TR3
+            CR3 = TR2-TR3
+            CH(I,K,1) = TI2+TI3
+            CI3 = TI2-TI3
+            CR2 = TR1-TR4
+            CR4 = TR1+TR4
+            CI2 = TI1+TI4
+            CI4 = TI1-TI4
+            CH(I-1,K,2) = WA1(I-2)*CR2-WA1(I-1)*CI2
+            CH(I,K,2) = WA1(I-2)*CI2+WA1(I-1)*CR2
+            CH(I-1,K,3) = WA2(I-2)*CR3-WA2(I-1)*CI3
+            CH(I,K,3) = WA2(I-2)*CI3+WA2(I-1)*CR3
+            CH(I-1,K,4) = WA3(I-2)*CR4-WA3(I-1)*CI4
+            CH(I,K,4) = WA3(I-2)*CI4+WA3(I-1)*CR4
+  109    CONTINUE
+  110 CONTINUE
+  111 IF (MOD(IDO,2) .EQ. 1) RETURN
+  105 DO 106 K=1,L1
+         TI1 = CC(1,2,K)+CC(1,4,K)
+         TI2 = CC(1,4,K)-CC(1,2,K)
+         TR1 = CC(IDO,1,K)-CC(IDO,3,K)
+         TR2 = CC(IDO,1,K)+CC(IDO,3,K)
+         CH(IDO,K,1) = TR2+TR2
+         CH(IDO,K,2) = SQRT2*(TR1-TI1)
+         CH(IDO,K,3) = TI2+TI2
+         CH(IDO,K,4) = -SQRT2*(TR1+TI1)
+  106 CONTINUE
+  107 RETURN
+      END