SLATEC Routines --- BESJ0 ---

*DECK BESJ0
      FUNCTION BESJ0 (X)
C***BEGIN PROLOGUE  BESJ0
C***PURPOSE  Compute the Bessel function of the first kind of order
C            zero.
C***LIBRARY   SLATEC (FNLIB)
C***CATEGORY  C10A1
C***TYPE      SINGLE PRECISION (BESJ0-S, DBESJ0-D)
C***KEYWORDS  BESSEL FUNCTION, FIRST KIND, FNLIB, ORDER ZERO,
C             SPECIAL FUNCTIONS
C***AUTHOR  Fullerton, W., (LANL)
C***DESCRIPTION
C
C BESJ0(X) calculates the Bessel function of the first kind of
C order zero for real argument X.
C
C Series for BJ0        on the interval  0.          to  1.60000D+01
C                                        with weighted error   7.47E-18
C                                         log weighted error  17.13
C                               significant figures required  16.98
C                                    decimal places required  17.68
C
C Series for BM0        on the interval  0.          to  6.25000D-02
C                                        with weighted error   4.98E-17
C                                         log weighted error  16.30
C                               significant figures required  14.97
C                                    decimal places required  16.96
C
C Series for BTH0       on the interval  0.          to  6.25000D-02
C                                        with weighted error   3.67E-17
C                                         log weighted error  16.44
C                               significant figures required  15.53
C                                    decimal places required  17.13
C
C***REFERENCES  (NONE)
C***ROUTINES CALLED  CSEVL, INITS, R1MACH, XERMSG
C***REVISION HISTORY  (YYMMDD)
C   770401  DATE WRITTEN
C   890210  REVISION DATE from Version 3.2
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   900315  CALLs to XERROR changed to CALLs to XERMSG.  (THJ)
C   900326  Removed duplicate information from DESCRIPTION section.
C           (WRB)
C***END PROLOGUE  BESJ0