FUNCTION BESJ1(X)
C***BEGIN PROLOGUE  BESJ1
C***DATE WRITTEN   780601   (YYMMDD)
C***REVISION DATE  820801   (YYMMDD)
C***CATEGORY NO.  C10A1
C***KEYWORDS  BESSEL FUNCTION,FIRST KIND,ORDER ONE,SPECIAL FUNCTION
C***AUTHOR  FULLERTON, W., (LANL)
C***PURPOSE  Computes the Bessel function of the first kind of order one
C***DESCRIPTION
C
C BESJ1(X) calculates the Bessel function of the first kind of
C order one for real argument X.
C
C Series for BJ1        on the interval  0.          to  1.60000D+01
C                                        with weighted error   4.48E-17
C                                         log weighted error  16.35
C                               significant figures required  15.77
C                                    decimal places required  16.89
C
C Series for BM1        on the interval  0.          to  6.25000D-02
C                                        with weighted error   5.61E-17
C                                         log weighted error  16.25
C                               significant figures required  14.97
C                                    decimal places required  16.91
C
C Series for BTH1       on the interval  0.          to  6.25000D-02
C                                        with weighted error   4.10E-17
C                                         log weighted error  16.39
C                               significant figures required  15.96
C                                    decimal places required  17.08
C***REFERENCES  (NONE)
C***ROUTINES CALLED  CSEVL,INITS,R1MACH,XERROR
C***END PROLOGUE  BESJ1