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[bug #58032] gsl_sf_hyperg_1F1 returning incorrect result for nonpositiv
From: |
Jackson Vanover |
Subject: |
[bug #58032] gsl_sf_hyperg_1F1 returning incorrect result for nonpositive integers |
Date: |
Mon, 23 Mar 2020 19:25:18 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:74.0) Gecko/20100101 Firefox/74.0 |
URL:
<https://savannah.gnu.org/bugs/?58032>
Summary: gsl_sf_hyperg_1F1 returning incorrect result for
nonpositive integers
Project: GNU Scientific Library
Submitted by: jacksonvanover
Submitted on: Mon 23 Mar 2020 11:25:16 PM UTC
Category: Accuracy problem
Severity: 3 - Normal
Operating System: Ubuntu 18.04
Status: None
Assigned to: None
Open/Closed: Open
Release: 2.6
Discussion Lock: Any
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Details:
Using version 2.6 of GSL from ftp://ftp.gnu.org/gnu/gsl/gsl-2.6.tar.gz
OS is Ubuntu 18.04.2 LTS
Hardware is a Dell workstation with a 3.60 GHz Intel i7-4790 and 32 GB
of RAM
Compiler is gcc 7.4.0 with the -w option
When evaluating gsl_sf_hyperg_1F1 or gsl_sf_hyperg_1F1_int with b=0
and x=0, the return is consistently 1 even though the confluent
hypergeometric function does not exist when b is a nonpositive integer
(see https://dlmf.nist.gov/13.2)
#include <gsl/gsl_sf.h>
#include <stdio.h>
#include <gsl/gsl_math.h>
#include <float.h>
int main (void){
double out1, out2;
out1 = gsl_sf_hyperg_1F1(2, 0, 0);
out2 = gsl_sf_hyperg_1F1_int(2, 0, 0);
printf("%.*f\n", DBL_DIG-1, out1);
printf("%.21e\n", out1);
printf("%.*f\n", DBL_DIG-1, out2);
printf("%.21e\n", out2);
return 0;
}
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- [bug #58032] gsl_sf_hyperg_1F1 returning incorrect result for nonpositive integers,
Jackson Vanover <=