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LI Function
Math Engineering Class

Public Function LI( _
    ByVal vX As Variant _
    ) As Variant

Compute the logarithmic integral.

Examples: 
    IsNull(LI(0)) = True
    LI(0.1) = -0.032389789593291
    LI(0.5) = -0.378671043061088
    LI(0.9) = -1.77580068342352
    IsNull(LI(1)) = True
    LI(1.1) = -1.6757728303192
    LI(5.0) = 3.63458831003265
See also: 
    E1 Function
    EI Function
    DLI Function
vX: Function returns Null if vX is Null or cannot be fixed up to a Double precision floating point number.

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