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Limit for gsl_sf_Si
From: |
Jackson Vanover |
Subject: |
Limit for gsl_sf_Si |
Date: |
Thu, 16 Jan 2020 14:04:24 -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
When evaluating the Si(inf), we get a return of NaN though the limit
approaches 1.570796326794896619231322 (
http://mpmath.org/doc/1.1.0/functions/expintegrals.html?highlight=si#mpmath.si
)
#include <gsl/gsl_sf.h>
#include <stdio.h>
#include <gsl/gsl_math.h>
int main (void){
double out;
out = gsl_sf_Si(GSL_POSINF);
printf("%f\n", out);
printf("%.21e\n", out);
return 0;
}
Best,
Jackson Vanover
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