__Random:__gsl_rng ***gsl_rng_alloc***(const gsl_rng_type **`T`)-
This function returns a pointer to a newly-created
instance of a random number generator of type
`T`. For example, the following code creates an instance of the Tausworthe generator,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

`GSL_ENOMEM`

.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`GSL_RNG_SEED`

(see section Random number environment variables).The details of the available generator types are described later in this chapter.

__Random:__void**gsl_rng_set***(const gsl_rng **`r`, unsigned long int`s`)-
This function initializes (or `seeds') the random number generator. If
the generator is seeded with the same value of
`s`on two different runs, the same stream of random numbers will be generated by successive calls to the routines below. If different values of`s`are supplied, then the generated streams of random numbers should be completely different. If the seed`s`is zero then the standard seed from the original implementation is used instead. For example, the original Fortran source code for the`ranlux`

generator used a seed of 314159265, and so choosing`s`equal to zero reproduces this when using`gsl_rng_ranlux`

.

__Random:__void**gsl_rng_free***(gsl_rng **`r`)-
This function frees all the memory associated with the generator
`r`.

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