besj1.f
FUNCTION BESJ1 (X)
C***BEGIN PROLOGUE BESJ1
C***PURPOSE Compute the Bessel function of the first kind of order one.
C***LIBRARY SLATEC (FNLIB)
C***CATEGORY C10A1
C***TYPE SINGLE PRECISION (BESJ1-S, DBESJ1-D)
C***KEYWORDS BESSEL FUNCTION, FIRST KIND, FNLIB, ORDER ONE,
C SPECIAL FUNCTIONS
C***AUTHOR Fullerton, W., (LANL)
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
C***REFERENCES (NONE)
C***ROUTINES CALLED CSEVL, INITS, R1MACH, XERMSG
C***REVISION HISTORY (YYMMDD)
C 780601 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 BESJ1