dbesj1.f
DOUBLE PRECISION FUNCTION DBESJ1 (X)
C***BEGIN PROLOGUE DBESJ1
C***PURPOSE Compute the Bessel function of the first kind of order one.
C***LIBRARY SLATEC (FNLIB)
C***CATEGORY C10A1
C***TYPE DOUBLE 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 DBESJ1(X) calculates the double precision Bessel function of the
C first kind of order one for double precision argument X.
C
C Series for BJ1 on the interval 0. to 1.60000E+01
C with weighted error 1.16E-33
C log weighted error 32.93
C significant figures required 32.36
C decimal places required 33.57
C
C***REFERENCES (NONE)
C***ROUTINES CALLED D1MACH, D9B1MP, DCSEVL, INITDS, XERMSG
C***REVISION HISTORY (YYMMDD)
C 780601 DATE WRITTEN
C 890531 Changed all specific intrinsics to generic. (WRB)
C 890531 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 910401 Corrected error in code which caused values to have the
C wrong sign for arguments less than 4.0. (WRB)
C***END PROLOGUE DBESJ1