dbesk0.f
DOUBLE PRECISION FUNCTION DBESK0 (X)
C***BEGIN PROLOGUE DBESK0
C***PURPOSE Compute the modified (hyperbolic) Bessel function of the
C third kind of order zero.
C***LIBRARY SLATEC (FNLIB)
C***CATEGORY C10B1
C***TYPE DOUBLE PRECISION (BESK0-S, DBESK0-D)
C***KEYWORDS FNLIB, HYPERBOLIC BESSEL FUNCTION,
C MODIFIED BESSEL FUNCTION, ORDER ZERO, SPECIAL FUNCTIONS,
C THIRD KIND
C***AUTHOR Fullerton, W., (LANL)
C***DESCRIPTION
C
C DBESK0(X) calculates the double precision modified (hyperbolic)
C Bessel function of the third kind of order zero for double
C precision argument X. The argument must be greater than zero
C but not so large that the result underflows.
C
C Series for BK0 on the interval 0. to 4.00000E+00
C with weighted error 3.08E-33
C log weighted error 32.51
C significant figures required 32.05
C decimal places required 33.11
C
C***REFERENCES (NONE)
C***ROUTINES CALLED D1MACH, DBESI0, DBSK0E, 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 DBESK0