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


You are not allowed to post comments on this tracker with your current authentication level.

bug #58060: Dropped NaN from gsl_sf_laguerre_n

Submitter:  Jackson Vanover <jacksonvanover>
Submitted:  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

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>


(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

No files currently attached


Depends on the following items: None found

Items that depend on this one: None found


Carbon-Copy List
  • -email is unavailable- added by jacksonvanover (Submitted the item)

    No changes have been made to this item

    Back to the top

    Powered by Savane 3.13-e652.
    Corresponding source code