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! CHGUL: confluent hypergeometric function U(a,b,x) for large argument X.
Licensing:
This routine is copyrighted by Shanjie Zhang and Jianming Jin. However,
they give permission to incorporate this routine into a user program
provided that the copyright is acknowledged.
Modified:
22 July 2012
Author:
Shanjie Zhang, Jianming Jin
Reference:
Shanjie Zhang, Jianming Jin,
Computation of Special Functions,
Wiley, 1996,
ISBN: 0-471-11963-6,
LC: QA351.C45.
Parameters:
Input, real ( kind = 8 ) A, B, parameters.
Input, real ( kind = 8 ) X, the argument.
Output, real ( kind = 8 ) HU, the value of U(a,b,x).
Output, integer ( kind = 4 ) ID, the estimated number of
significant digits.
Type | Intent | Optional | Attributes | Name | ||
---|---|---|---|---|---|---|
real(kind=8) | :: | a | ||||
real(kind=8) | :: | b | ||||
real(kind=8) | :: | x | ||||
real(kind=8) | :: | hu | ||||
integer(kind=4) | :: | id |