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- *DECK DLI
- DOUBLE PRECISION FUNCTION DLI (X)
- C***BEGIN PROLOGUE DLI
- C***PURPOSE Compute the logarithmic integral.
- C***LIBRARY SLATEC (FNLIB)
- C***CATEGORY C5
- C***TYPE DOUBLE PRECISION (ALI-S, DLI-D)
- C***KEYWORDS FNLIB, LOGARITHMIC INTEGRAL, SPECIAL FUNCTIONS
- C***AUTHOR Fullerton, W., (LANL)
- C***DESCRIPTION
- C
- C DLI(X) calculates the double precision logarithmic integral
- C for double precision argument X.
- C
- C***REFERENCES (NONE)
- C***ROUTINES CALLED DEI, 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 DLI
- DOUBLE PRECISION X, DEI
- C***FIRST EXECUTABLE STATEMENT DLI
- IF (X .LE. 0.D0) CALL XERMSG ('SLATEC', 'DLI',
- + 'LOG INTEGRAL UNDEFINED FOR X LE 0', 1, 2)
- IF (X .EQ. 1.D0) CALL XERMSG ('SLATEC', 'DLI',
- + 'LOG INTEGRAL UNDEFINED FOR X = 0', 2, 2)
- C
- DLI = DEI (LOG(X))
- C
- RETURN
- END
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