besi0.f
FUNCTION BESI0 (X)
C***BEGIN PROLOGUE BESI0
C***PURPOSE Compute the hyperbolic Bessel function of the first kind
C of order zero.
C***LIBRARY SLATEC (FNLIB)
C***CATEGORY C10B1
C***TYPE SINGLE PRECISION (BESI0-S, DBESI0-D)
C***KEYWORDS FIRST KIND, FNLIB, HYPERBOLIC BESSEL FUNCTION,
C MODIFIED BESSEL FUNCTION, ORDER ZERO, SPECIAL FUNCTIONS
C***AUTHOR Fullerton, W., (LANL)
C***DESCRIPTION
C
C BESI0(X) computes the modified (hyperbolic) Bessel function
C of the first kind of order zero and real argument X.
C
C Series for BI0 on the interval 0. to 9.00000D+00
C with weighted error 2.46E-18
C log weighted error 17.61
C significant figures required 17.90
C decimal places required 18.15
C
C***REFERENCES (NONE)
C***ROUTINES CALLED BESI0E, CSEVL, INITS, R1MACH, XERMSG
C***REVISION HISTORY (YYMMDD)
C 770401 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 900326 Removed duplicate information from DESCRIPTION section.
C (WRB)
C***END PROLOGUE BESI0