gsl_rng * r = gsl_rng_alloc (gsl_rng_taus);
If there is insufficient memory to create the generator then the
function returns a null pointer and the error handler is invoked with an
error code of
The generator is automatically initialized with the default seed,
gsl_rng_default_seed. This is zero by default but can be changed
either directly or by using the environment variable
(see section Random number environment variables).
The details of the available generator types are described later in this chapter.
ranluxgenerator used a seed of 314159265, and so choosing s equal to zero reproduces this when using