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Bessel I0 Function
Math Engineering Class

Public Function BesselI0( _
    ByVal vX As Variant _
    ) As Variant

Compute the hyperbolic Bessel function of the first kind of order zero.

Examples: 
    BesselI0(-.5) = 1.06348337074132
    BesselI0(0.0) = 1
    BesselI0(0.5) = 1.06348337074132
    BesselI0(5.0) = 27.2398718236044
    BesselI0(5.0) = BesselI(5.0, 0)
See also: 
    BesselI0E Function
    BesselI1 Function
    BesselI Function
    BesselK0 Function
    DBESI0 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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