bugGNU Scientific Library - Bugs: bug #58060, Dropped NaN from gsl_sf_laguerre_n

 
 

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bug #58060: Dropped NaN from gsl_sf_laguerre_n

Submitted by:  Jackson Vanover <jacksonvanover>
Submitted on:  Sat 28 Mar 2020 04:33:09 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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Fri 29 May 2020 02:07:22 AM UTC, comment #1: 

I'm also observing this same behavior when the first argument is zero the third argument is a NaN

Jackson Vanover <jacksonvanover>
Sat 28 Mar 2020 04:33:09 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 degree of the laguerre polynomial is zero and the second argument
is a NaN, eval_genlaguerre returns 1.0. Despite the fact that the laguerre
polynomial of degree zero evaluates to 1 over its whole domain, the NaN
does not adhere to the domain restriction stated in the docs that the
second argument should be greater than -1.

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

int main (void){
double out;
out = gsl_sf_laguerre_n(0, GSL_NAN, 2.2738632088209076);

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

Jackson Vanover <jacksonvanover>

 

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