Confluent hypergeometric function of the second kind Calculator

Calculates confluent hypergeometric function of the second kind or Tricomi's function U(a,b,z).

a
b
z

U(a,b,z)
    1.  
    Confluent hypergeometric function of the second kind
    [1-2] /2Disp-Num
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    [1]  2014/07/19 07:29   Male / 50 years old level / An engineer / Not at All /
    Purpose of use
    Confirmation of my own implementation.
    Comment/Request
    Are the results of Kummer U correct for larges values of a? For instance, when a=50, b= 0.2, z = 5, the output is -6.E-73. In fact the results are negative for many cases.
    [2]  2013/03/15 10:28   Male / 30 years old level / High-school/ University/ Grad student / Very /
    Purpose of use
    Working on a thesis.
    Comment/Request
    How do I compute the U(a,b,z) when a=-2500,b=0.5,large z for example z=10268.
    from Keisan
    Confluent hypergeometric function of the second kind:
    U(-2500,0.5,10268)= 5.71332832943457105E+9632
    This answer is the same as KummerU(-2500,0.5,10268) in Maple9.5.

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