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Incorrect Result from cosine function with inf input
From: |
Jackson Vanover |
Subject: |
Incorrect Result from cosine function with inf input |
Date: |
Wed, 6 Nov 2019 11:03:34 -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 passing positive infinity to gsl_sf_cos_pi, the
result is 1 which doesn't make sense as the cosine function oscillates
between -1 and 1
#include <gsl/gsl_sf.h>
#include <stdio.h>
#include <gsl/gsl_math.h>
int main(void){
double out;
out = gsl_sf_cos_pi(GSL_POSINF);
printf("%f\n", out);
return 0;
}
Best,
Jackson Vanover
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