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[Bug-gsl] possible bug in gsl_sf_hyperg_U

From: Stefan Gerlach
Subject: [Bug-gsl] possible bug in gsl_sf_hyperg_U
Date: Thu, 3 Apr 2008 11:22:01 +0200
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I have a problem using gsl_sf_hyperg_U with certain arguments.
running this example

                printf("%g %g\n",z,gsl_sf_hyperg_U(-2.0,4.0,z));

i get 

        2.2 2.84
        2.1 3.41
        2 4
        gsl: psi.c:381: ERROR: domain error
        Default GSL error handler invoked.

AFAIK the hypergeometricU is well defined for z> 0.0.
I get the same error with gsl-1.11 on openSUSE 10.X i586 and x86_64.

Stefan Gerlach

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