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Bessel I1 Function
Math Engineering Class

Public Function BesselI1( _
    ByVal vX As Variant _
    ) As Variant

Compute the modified (hyperbolic) Bessel function of the first kind of order one.

Examples: 
    BesselI1(-.5) = -0.257894305390896
    BesselI1(0.0) = 0
    BesselI1(0.5) = 0.257894305390896
    BesselI1(5.0) = 24.3356421424505
    BesselI1(5.0) = BesselI(5.0, 1)
See also: 
    BesselI1E Function
    BesselI0 Function
    BesselI Function
    BesselK1 Function
    DBESI1 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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