DBESK1(3)

SYNOPSIS
DOUBLE PRECISION FUNCTION DBESK1 (X)

NAME
dbesk1 - Compute the modified (hyperbolic) Bessel function of the third kind of order one.

LIBRARY
SLATEC (FNLIB)

CATEGORY
C10B1

TYPE
DOUBLE PRECISION (BESK1-S, DBESK1-D)

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

AUTHOR
Fullerton, W., (LANL)

DESCRIPTION
DBESK1(X) calculates the double precision modified (hyperbolic) Bessel function of the third kind of order one for double precision argument X. The argument must be large enough that the result does not overflow and small enough that the result does not underflow. Series for BK1 on the interval 0. to 4.00000E+00 with weighted error 9.16E-32 log weighted error 31.04 significant figures required 30.61 decimal places required 31.64

REFERENCES
(NONE)

ROUTINES CALLED
D1MACH, DBESI1, DBSK1E, 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)