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Logarithm Function
Math Trig Complex Class

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

Natural logarithm of a complex or real number.

Top20: This function is among our "top-twenty" most useful.
Examples: 
    Logarithm(-1) = "0|3.14159265358979"
    Logarithm(0) = "#NINF"
    Logarithm(1) = 0
    Logarithm(2) = 0.693147180559945
    Logarithm(e) = 1
    Logarithm(10) = 2.30258509299405
    Logarithm("2.3|-4.5") = "1.6201229253022|-1.09829939127783"
See also: 
    LogBaseN Function
    Log10 Function
    Log Function (Visual Basic)
vX: Number whose natural logarithm is returned. Function returns Null if vX is Null or cannot be fixed up to a real or complex number (as defined by the ComplexStringToReals function). Complex numbers are represented within strings as "R|I" where R is the real part and I is the imaginary part.

Function returns the string "#NINF" to represent negative infinity if vX is 0 (zero).

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