bugGNU Scientific Library - Bugs: bug #58062, Dropped NaN from...

 
 

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bug #58062: Dropped NaN from gsl_sf_hyperg1F1_int

Submitted by:  Jackson Vanover <jacksonvanover>
Submitted on:  Sat 28 Mar 2020 04:44:01 PM UTC  
 
Category:  Accuracy problem Severity:  3 - Normal
Operating System:  Ubuntu 18.04 Status:  None
Assigned to:  None Open/Closed:  Open
Release:  2.6

Thu 28 May 2020 02:58:07 AM UTC, comment #1: 

Checking back on this, I realize that the example I gave does not match the description; the example should be as follows:

#include <gsl/gsl_sf.h>
#include <stdio.h>
#include <gsl/gsl_math.h>

int main (void){
double out;
out = gsl_sf_hyperg_1F1_int(0, 1, GSL_NAN);

printf("%f\n", out);
printf("%.21e\n", out);
return 0;
}

Jackson Vanover <jacksonvanover>
Sat 28 Mar 2020 04:44:01 PM UTC, original submission:  

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 the first argument is zero and third argument is a NaN,
gsl_sf_hyperg_1F1_int returns 1. When the first argument is nonzero, the
error handler is invoked as would be expected.

#include <gsl/gsl_sf.h>
#include <stdio.h>
#include <gsl/gsl_math.h>

int main (void){
double out;
out = gsl_sf_hyperg_U_int(0, 1, GSL_NAN);

printf("%f\n", out);
printf("%.21e\n", out);
return 0;
}

Jackson Vanover <jacksonvanover>

 

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