Bugfix in AliPoints2Memory

[u/mrichter/AliRoot.git] / MINICERN / mathlib / gen / c / dclaus64.F

*
* $Id$
*
* $Log$
* Revision 1.2  1996/04/02 16:23:45  mclareni
* More precise dclaus64 (C326), test added and C344 removed from TESTALL
*
* Revision 1.1.1.1  1996/04/01 15:02:03  mclareni
* Mathlib gen
*
*
#include "gen/pilot.h"
#if defined(CERNLIB_DOUBLE)
      FUNCTION DCLAUS(X)
      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
#endif
#if !defined(CERNLIB_DOUBLE)
      FUNCTION RCLAUS(X)
#include "gen/imp64.inc"
#endif
 
      DIMENSION A(0:8),B(0:13)
 
      PARAMETER (R1 = 1, HF =R1/2)
      PARAMETER (PI = 3.14159 26535 89793 24D0)
      PARAMETER (PI2 = 2*PI, PIH = PI/2, RPIH = 2/PI)
 
      DATA A( 0) / 0.02795 28319 73575 6613D0/
      DATA A( 1) / 0.00017 63088 74389 8116D0/
      DATA A( 2) / 0.00000 12662 74146 1157D0/
      DATA A( 3) / 0.00000 00117 17181 8134D0/
      DATA A( 4) / 0.00000 00001 23006 4129D0/
      DATA A( 5) / 0.00000 00000 01395 2729D0/
      DATA A( 6) / 0.00000 00000 00016 6908D0/
      DATA A( 7) / 0.00000 00000 00000 2076D0/
      DATA A( 8) / 0.00000 00000 00000 0027D0/
 
      DATA B( 0) / 0.63909 70888 57265 341D0/
      DATA B( 1) /-0.05498 05693 01851 716D0/
      DATA B( 2) /-0.00096 12619 45950 606D0/
      DATA B( 3) /-0.00003 20546 86822 550D0/
      DATA B( 4) /-0.00000 13294 61695 426D0/
      DATA B( 5) /-0.00000 00620 93601 824D0/
      DATA B( 6) /-0.00000 00031 29600 656D0/
      DATA B( 7) /-0.00000 00001 66351 954D0/
      DATA B( 8) /-0.00000 00000 09196 527D0/
      DATA B( 9) /-0.00000 00000 00524 004D0/
      DATA B(10) /-0.00000 00000 00030 580D0/
      DATA B(11) /-0.00000 00000 00001 820D0/
      DATA B(12) /-0.00000 00000 00000 110D0/
      DATA B(13) /-0.00000 00000 00000 007D0/
 
      V=MOD(ABS(X),PI2)
      S=SIGN(R1,X)
      IF(V .GT. PI) THEN
       V=PI2-V
       S=-S
      ENDIF
      IF(V .EQ. 0 .OR. V .EQ. PI) THEN
       H=0
      ELSEIF(V .LT. PIH) THEN
       U=RPIH*V
       H=2*U**2-1
       ALFA=H+H
       B1=0
       B2=0
       DO 1 I = 8,0,-1
       B0=A(I)+ALFA*B1-B2
       B2=B1
    1  B1=B0
       H=V*(1-LOG(V)+HF*V**2*(B0-H*B2))
      ELSE
       U=RPIH*V-2
       H=2*U**2-1
       ALFA=H+H
       B1=0
       B2=0
       DO 2 I = 13,0,-1
       B0=B(I)+ALFA*B1-B2
       B2=B1
    2  B1=B0
       H=(PI-V)*(B0-H*B2)
      ENDIF
      DCLAUS=S*H
      RETURN
      END