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34 lines
1.1 KiB
Fortran
34 lines
1.1 KiB
Fortran
*DECK DLI
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DOUBLE PRECISION FUNCTION DLI (X)
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C***BEGIN PROLOGUE DLI
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C***PURPOSE Compute the logarithmic integral.
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C***LIBRARY SLATEC (FNLIB)
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C***CATEGORY C5
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C***TYPE DOUBLE PRECISION (ALI-S, DLI-D)
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C***KEYWORDS FNLIB, LOGARITHMIC INTEGRAL, 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 DLI(X) calculates the double precision logarithmic integral
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C for double precision argument X.
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C
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C***REFERENCES (NONE)
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C***ROUTINES CALLED DEI, XERMSG
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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 900315 CALLs to XERROR changed to CALLs to XERMSG. (THJ)
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C***END PROLOGUE DLI
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DOUBLE PRECISION X, DEI
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C***FIRST EXECUTABLE STATEMENT DLI
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IF (X .LE. 0.D0) CALL XERMSG ('SLATEC', 'DLI',
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+ 'LOG INTEGRAL UNDEFINED FOR X LE 0', 1, 2)
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IF (X .EQ. 1.D0) CALL XERMSG ('SLATEC', 'DLI',
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+ 'LOG INTEGRAL UNDEFINED FOR X = 0', 2, 2)
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C
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DLI = DEI (LOG(X))
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C
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RETURN
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END
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