You are looking at historical revision 13621 of this page. It may differ significantly from its current revision.

## Documentation for the `gsl-srfi-27` egg

### Introduction

The `gsl-srfi-27` egg provides an implementation of SRFI-27 which uses the GSL behind the scenes to generate pseudo-random numbers.

### Examples

(use syntax-case gsl-srfi-27) (import gsl-srfi-27) (random-real) ; => some random real number (random-source-randomize!default-random-source) (random-integer 100) ; => some integer between 0 and 99 (inclusive)

You can also use some of the simulation-quality generators from the GSL:

(use syntax-case gsl-srfi-27) (import gsl-srfi-27) (let*((luxury-source (make-random-source *ranlxd2*)) ; Ahhh---what a luxurious generator (luxury-real (random-source-make-reals luxury-source))) (random-source-randomize! luxury-source) ; Don't forget this, or you won't experience true luxury (luxury-real)) ;; A *very* random number.

### Authors

Written by Will M. Farr.

### License

Released under the GPL.

### Requirements

Requires the eggs `syntax-case` and `easyffi`.

### Documentation

In addition to the routines from SRFI-27, after issuing `(import gsl-srfi-27)` the following will be available in the namespace:

[rng-type] *mt19937* [rng-type] *ranlxd1* [rng-type] *ranlxd2* [rng-type] *cmrg* [rng-type] *mrg* [rng-type] *taus* [rng-type] *taus2* [rng-type] *gfsr4*

A subset of the GSL simulation-quality generator types, suitable to pass to `(make-random-source TYPE)`. Don't accept anything less than a simulation-quality generator!

[procedure] (rng-type? OBJ)

`#f` unless `OBJ` is one of the above generator types.

#### Standards Violation

The `gsl-srfi-27` egg does not completely conform to the SRFI-27 standard: `(random-source-make-reals SOURCE [UNIT])` throws an error if the `UNIT` parameter is passed instead of generating a random source with the given quantization.

### Version History

- Version 1.0
- Initial release.