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Ln Rel Function
Math Engineering Class

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

Evaluate ln(1+X) accurate in the sense of relative error.

Examples: 
    LnRel(-0.5) = -0.693147180559945
    LnRel(-0.1) = -0.105360515657826
    LnRel(+0.0) = 0
    LnRel(+0.5) = 0.405465108108164
    LnRel(+1.0) = 0.693147180559945
    LnRel(+5.0) = 1.79175946922805
See also: 
    ExpRel Function
    DLNREL Function
vX: Function returns Null if vX is Null or cannot be fixed up to a Double precision floating point number.

LnRel(X) calculates the double precision natural logarithm of (1.0+X) for double precision argument X. This routine should be used when X is small and accurate to calculate the logarithm accurately (in the relative error sense) in the neighborhood of 1.0.

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