d9lgit.f
DOUBLE PRECISION FUNCTION D9LGIT (A, X, ALGAP1)
C***BEGIN PROLOGUE D9LGIT
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Warning: this routine is not intended to be user-callable.
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C***SUBSIDIARY
C***PURPOSE Compute the logarithm of Tricomi's incomplete Gamma
C function with Perron's continued fraction for large X and
C A .GE. X.
C***LIBRARY SLATEC (FNLIB)
C***CATEGORY C7E
C***TYPE DOUBLE PRECISION (R9LGIT-S, D9LGIT-D)
C***KEYWORDS FNLIB, INCOMPLETE GAMMA FUNCTION, LOGARITHM,
C PERRON'S CONTINUED FRACTION, SPECIAL FUNCTIONS, TRICOMI
C***AUTHOR Fullerton, W., (LANL)
C***DESCRIPTION
C
C Compute the log of Tricomi's incomplete gamma function with Perron's
C continued fraction for large X and for A .GE. X.
C
C***REFERENCES (NONE)
C***ROUTINES CALLED D1MACH, 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 900720 Routine changed from user-callable to subsidiary. (WRB)
C***END PROLOGUE D9LGIT