dbesi1.f
DOUBLE PRECISION FUNCTION DBESI1 (X)
C***BEGIN PROLOGUE DBESI1
C***PURPOSE Compute the modified (hyperbolic) Bessel function of the
C first kind of order one.
C***LIBRARY SLATEC (FNLIB)
C***CATEGORY C10B1
C***TYPE DOUBLE PRECISION (BESI1-S, DBESI1-D)
C***KEYWORDS FIRST KIND, FNLIB, HYPERBOLIC BESSEL FUNCTION,
C MODIFIED BESSEL FUNCTION, ORDER ONE, SPECIAL FUNCTIONS
C***AUTHOR Fullerton, W., (LANL)
C***DESCRIPTION
C
C DBESI1(X) calculates the double precision modified (hyperbolic)
C Bessel function of the first kind of order one and double precision
C argument X.
C
C Series for BI1 on the interval 0. to 9.00000E+00
C with weighted error 1.44E-32
C log weighted error 31.84
C significant figures required 31.45
C decimal places required 32.46
C
C***REFERENCES (NONE)
C***ROUTINES CALLED D1MACH, DBSI1E, DCSEVL, INITDS, XERMSG
C***REVISION HISTORY (YYMMDD)
C 770701 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***END PROLOGUE DBESI1