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Bessel K1 Function
Math Engineering Class

Public Function BesselK1( _
    ByVal vX As Variant _
    ) As Variant

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

Examples: 
    BesselK1(0.1) = 9.85384478087061
    BesselK1(0.5) = 1.6564411200033
    BesselK1(5.0) = 4.04461344545216E-03
    BesselK1(5.0) = BesselK(5.0, 1)
See also: 
    BesselK1E Function
    BesselK0 Function
    BesselK Function
    BesselI1 Function
    DBESK1 Function
vX: Function returns Null if vX is Null or cannot be fixed up to a Double precision floating point number.

BesselK1 calculates the double precision modified (hyperbolic) Bessel function of the third kind of order one for double precision argument X. The argument must be large enough that the result does not overflow and small enough that the result does not underflow.

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