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Log 10 Function
Math Trig Complex Class

Public Function Log10( _
    ByVal vX As Variant _
    ) As Variant

"Logarithm Base 10"
Log base-10 of X for a real or complex number.

Examples: 
    Log10(-1) = "0|1.36437635384184"
    IsNull(Log10(0)) = True
    Log10(1) = 0
    Log10(2) = 0.301029995663981
    Log10(10) = 1
    Log10("2.3|-4.5") = "0.7036104464637|-0.476985365109662"
See also: 
    Logarithm Function
    LogBaseN Function
    Log Function (Visual Basic)
vX: Number whose base-10 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.
Definition: 
    Logarithm(X) / Log(10)

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