GSL

The GNU Scientific Library (GSL) is a collection of routines for numerical computing. The routines have been written from scratch in C. See here for the types of routines that the GSL provides.

Usage

The GSL library can be loaded by running one of:

module load GSL/2.6-GCC-8.3.0
module load GSL/2.5-GCC-8.2.0-2.31.1

which will also load a particular GCC, or:

module load GSL/2.5-iccifort-2019.1.144-GCC-8.2.0-2.31.1

if you also want to activate or have already activated icc/icpc/ifort 2019.1.

Example

A example program that uses the GSL (taken from the GSL documentation):

#include <stdio.h>
#include <stdlib.h>
#include <gsl/gsl_sf_bessel.h>

int main (void) {
  double x = 5.0;
  double y = gsl_sf_bessel_J0(x);

  printf("J0(%g) = %.18e\n", x, y);

  return EXIT_SUCCESS;
}

Build this using:

gcc -Wall -lgsl -lgslcblas -o test test.c  # OR
icc -Wall -lgsl -lgslcblas -o test test.c

Then run using:

./test

which should print the following (correct to double-precision accuracy):

J0(5) = -1.775967713143382642e-01

NB generally, you may not need to compile using -lgslcblas depending on which GSL routines you are using.