bugGNU Scientific Library - Bugs: bug #58063, Dropped NaNs in multiple cases

 
 

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bug #58063: Dropped NaNs in multiple cases

Submitted by:  Jackson Vanover <jacksonvanover>
Submitted on:  Sat 28 Mar 2020 04:58:51 PM UTC
 
Category:  Accuracy problem Severity:  3 - Normal
Operating System:  Ubuntu 18.04 Status:  None
Assigned to:  None Open/Closed:  Open
Release:  2.6
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Sat 28 Mar 2020 05:02:54 PM UTC, comment #1: 
Jackson Vanover <jacksonvanover>
Sat 28 Mar 2020 04:58:51 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

Descriptions:

when the second argument to gsl_sf_bessel_zero_Jnu is a NaN, that NaN is dropped and the function returns a zero without complaining. The same is true of an inf input.

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

When the first argument is zero and third argument is a NaN, gsl_sf_gegenpoly_n 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_bessel_zero_Jnu(1, GSL_NAN);

printf("%f\n", out);
printf("%.*e\n", out);

out = gsl_sf_hermite(0, GSL_NAN);

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

out = gsl_sf_gegenpoly_n(0, 2.5, GSL_NAN);

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

Jackson Vanover <jacksonvanover>

 

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