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Erf Function
Math Engineering Class

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

Compute the error function.

Examples: 
    Erf(-5.0) = -0.999999999998463
    Erf(-1.0) = -0.842700792949715
    Erf(-0.5) = -0.520499877813047
    Erf(+0.0) = 0
    Erf(+0.5) = 0.520499877813047
    Erf(+1.0) = 0.842700792949715
    Erf(+5.0) = 0.999999999998463
See also: 
    ErfC Function
    DERF 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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