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CHU Function
Math Engineering Class

Public Function CHU( _
      ByVal vA As Variant _
    , ByVal vB As Variant _
    , ByVal vX As Variant _
    ) As Variant

Compute the logarithmic confluent hypergeometric function.

Examples: 
    CHU(1, 2, 3) = 0.333333333333333
    CHU(2, 2, 3) = 7.12495930780148E-02
    CHU(3, 2, 3) = 1.14573160283673E-02
See also: 
    DCHU Function
vA: Function returns Null if vA is Null or cannot be fixed up to a Double precision floating point number.
vB: Function returns Null if vB is Null or cannot be fixed up to a Double precision floating point number.
vX: Function returns Null if vX is Null or cannot be fixed up to a Double precision floating point number.

CHU(A,B,X) calculates the double precision logarithmic confluent hypergeometric function U(A,B,X) for double precision arguments A, B, and X.
This routine is not valid when 1+A-B is close to zero if X is small.

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