Confluent Hypergeometric Function of the Second Kind

hi there a function that define the Confluent Hypergeometric Function of the Second Kind i have made a matlab function with the formula y=z.^(-a).*hypergeom([a,1+a-b],[],-1./z); this a correct formula...

thank you in advance george

Answer 1

[Walter Roberson]

If I read correctly, then: http://www.mathworks.com/help/symbolic/kummeru.html

[george veropoulos]

thank you i m writing a funcrion with integral form

function   y= U(a,b,z)
%UNTITLED Summary of this function goes here
%   Detailed explanation goes here
f=@(t)exp(-z.*t).*t.^(a-1).*(1+t).^(b-a-1)

y=integral(f,0,inf)./gamma(a)
end

the values are cloder with the y=z.^(-a).*hypergeom([a,1+a-b],[],-1./z); i think that is a the correct form..