besj0.f
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