dbesk1.f
DOUBLE PRECISION FUNCTION DBESK1 (X)
C***BEGIN PROLOGUE DBESK1
C***PURPOSE Compute the modified (hyperbolic) Bessel function of the
C third kind of order one.
C***LIBRARY SLATEC (FNLIB)
C***CATEGORY C10B1
C***TYPE DOUBLE PRECISION (BESK1-S, DBESK1-D)
C***KEYWORDS FNLIB, HYPERBOLIC BESSEL FUNCTION,
C MODIFIED BESSEL FUNCTION, ORDER ONE, SPECIAL FUNCTIONS,
C THIRD KIND
C***AUTHOR Fullerton, W., (LANL)
C***DESCRIPTION
C
C DBESK1(X) calculates the double precision modified (hyperbolic)
C Bessel function of the third kind of order one for double precision
C argument X. The argument must be large enough that the result does
C not overflow and small enough that the result does not underflow.
C
C Series for BK1 on the interval 0. to 4.00000E+00
C with weighted error 9.16E-32
C log weighted error 31.04
C significant figures required 30.61
C decimal places required 31.64
C
C***REFERENCES (NONE)
C***ROUTINES CALLED D1MACH, DBESI1, DBSK1E, 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 DBESK1