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38 lines
1.2 KiB
Fortran
38 lines
1.2 KiB
Fortran
*DECK ALGAMS
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SUBROUTINE ALGAMS (X, ALGAM, SGNGAM)
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C***BEGIN PROLOGUE ALGAMS
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C***PURPOSE Compute the logarithm of the absolute value of the Gamma
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C function.
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C***LIBRARY SLATEC (FNLIB)
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C***CATEGORY C7A
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C***TYPE SINGLE PRECISION (ALGAMS-S, DLGAMS-D)
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C***KEYWORDS ABSOLUTE VALUE OF THE LOGARITHM OF THE GAMMA FUNCTION,
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C FNLIB, SPECIAL FUNCTIONS
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C***AUTHOR Fullerton, W., (LANL)
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C***DESCRIPTION
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C
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C Evaluates the logarithm of the absolute value of the gamma
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C function.
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C X - input argument
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C ALGAM - result
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C SGNGAM - is set to the sign of GAMMA(X) and will
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C be returned at +1.0 or -1.0.
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C
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C***REFERENCES (NONE)
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C***ROUTINES CALLED ALNGAM
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C***REVISION HISTORY (YYMMDD)
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C 770701 DATE WRITTEN
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C 890531 Changed all specific intrinsics to generic. (WRB)
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C 890531 REVISION DATE from Version 3.2
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C 891214 Prologue converted to Version 4.0 format. (BAB)
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C***END PROLOGUE ALGAMS
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C***FIRST EXECUTABLE STATEMENT ALGAMS
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ALGAM = ALNGAM(X)
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SGNGAM = 1.0
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IF (X.GT.0.0) RETURN
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C
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INT = MOD (-AINT(X), 2.0) + 0.1
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IF (INT.EQ.0) SGNGAM = -1.0
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C
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RETURN
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END
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