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- *DECK ALI
- FUNCTION ALI (X)
- C***BEGIN PROLOGUE ALI
- C***PURPOSE Compute the logarithmic integral.
- C***LIBRARY SLATEC (FNLIB)
- C***CATEGORY C5
- C***TYPE SINGLE PRECISION (ALI-S, DLI-D)
- C***KEYWORDS FNLIB, LOGARITHMIC INTEGRAL, SPECIAL FUNCTIONS
- C***AUTHOR Fullerton, W., (LANL)
- C***DESCRIPTION
- C
- C ALI(X) computes the logarithmic integral; i.e., the
- C integral from 0.0 to X of (1.0/ln(t))dt.
- C
- C***REFERENCES (NONE)
- C***ROUTINES CALLED EI, XERMSG
- C***REVISION HISTORY (YYMMDD)
- C 770601 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 ALI
- C***FIRST EXECUTABLE STATEMENT ALI
- IF (X .LE. 0.0) CALL XERMSG ('SLATEC', 'ALI',
- + 'LOG INTEGRAL UNDEFINED FOR X LE 0', 1, 2)
- IF (X .EQ. 1.0) CALL XERMSG ('SLATEC', 'ALI',
- + 'LOG INTEGRAL UNDEFINED FOR X = 1', 2, 2)
- C
- ALI = EI (LOG(X) )
- C
- RETURN
- END
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