DBESI1(3)

SYNOPSIS
DOUBLE PRECISION FUNCTION DBESI1 (X)

NAME
dbesi1 - Compute the modified (hyperbolic) Bessel function of the first kind of order one.

LIBRARY
SLATEC (FNLIB)

CATEGORY
C10B1

TYPE
DOUBLE PRECISION (BESI1-S, DBESI1-D)

KEYWORDS
FIRST KIND, FNLIB, HYPERBOLIC BESSEL FUNCTION, MODIFIED BESSEL FUNCTION, ORDER ONE, SPECIAL FUNCTIONS

AUTHOR
Fullerton, W., (LANL)

DESCRIPTION
DBESI1(X) calculates the double precision modified (hyperbolic) Bessel function of the first kind of order one and double precision argument X. Series for BI1 on the interval 0. to 9.00000E+00 with weighted error 1.44E-32 log weighted error 31.84 significant figures required 31.45 decimal places required 32.46

REFERENCES
(NONE)

ROUTINES CALLED
D1MACH, DBSI1E, DCSEVL, INITDS, XERMSG

REVISION HISTORY (YYMMDD)
770701 DATE WRITTEN
890531 Changed all specific intrinsics to generic. (WRB)
890531 REVISION DATE from Version 3.2
891214 Prologue converted to Version 4.0 format. (BAB)
900315 CALLs to XERROR changed to CALLs to XERMSG. (THJ)