Ruby/GSL provides all the GSL special functions as module functions
under the GSL::Sf
module. The prefix gsl_sf
of C functions is replaced by GSL::Sf::
in Ruby/GSL.
ex1)
require 'gsl' p GSL::Sf::bessel_J0(x)
ex2)
require 'gsl' include GSL p Sf::bessel_J0(x)
ex2)
require 'gsl' include GSL::Sf p bessel_J0(x)
See GSL manual for the complete list of the special functions.