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[Bug-gsl] GSL gsl_sf_hyperg_2F1_e

From: Brian Gladman
Subject: [Bug-gsl] GSL gsl_sf_hyperg_2F1_e
Date: Thu, 30 Apr 2015 15:23:46 +0100
User-agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

When building with MSVC, I am now seing a single test failure:

FAIL: gsl_sf_hyperg_2F1_e(3.23191, -4.0229, 8.02291, 0.5, &r) [2115]
  unexpected return code: 11
  4.300243900348178494e-01  2.655871889646902615e-06
FAIL: Hypergeometric Functions [2144]

with an unexpected return code of 11, indicating that the maximum number
of iterations have been exceeded.

Changing the number of iterations in the loop that compiles the series
sum makes no difference, nor does changing the floating point model used
to compile the library.

The value returned doesn't look too bad when compared with the value
Mathematica gives:

gsl: 0.430024390034817|8494
mm:  0.430024390034817|064619266095678

so I am wondering if anyone has any bright ideas on what I might be able
to do about this.

   best regards,

     Brian Gladman

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