! CHGUBI: confluent hypergeometric function with integer argument B.
Discussion:
This procedure computes the confluent hypergeometric function
U(a,b,x) with integer ( kind = 4 ) b ( b = ±1,±2,... )
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:
31July2012
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.
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Nodes of different colours represent the following:
Solid arrows point from a procedure to one which it calls. Dashed
arrows point from an interface to procedures which implement that interface.
This could include the module procedures in a generic interface or the
implementation in a submodule of an interface in a parent module.