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Incorrect Result from pochhammer function with negInf input
From: |
Jackson Vanover |
Subject: |
Incorrect Result from pochhammer function with negInf input |
Date: |
Tue, 12 Nov 2019 13:18:02 -0800 |
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
Description: when the first argument to gsl_sf_poch is a negative
infinity, that negative infinity is dropped and the function returns a
zero. The docs state that if the first argument and the sum of the two
arguments are both negative, the limiting case is returned; that
doesn't happen here.
#include <gsl/gsl_sf.h>
#include <stdio.h>
#include <gsl/gsl_math.h>
int main (void){
double out;
out = gsl_sf_poch(GSL_NEGINF, 2.2738632088209076);
printf("%f\n", out);
printf("%.*e\n", out);
return 0;
}
Best,
Jackson Vanover
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