/**
* Reproducable and distributable random numbers.
* Jekejeke Prolog version.
*
* Warranty & Liability
* To the extent permitted by applicable law and unless explicitly
* otherwise agreed upon, XLOG Technologies GmbH makes no warranties
* regarding the provided information. XLOG Technologies GmbH assumes
* no liability that any problems might be solved with the information
* provided by XLOG Technologies GmbH.
*
* Rights & License
* All industrial property rights regarding the information - copyright
* and patent rights in particular - are the sole property of XLOG
* Technologies GmbH. If the company was not the originator of some
* excerpts, XLOG Technologies GmbH has at least obtained the right to
* reproduce, change and translate the information.
*
* Reproduction is restricted to the whole unaltered document. Reproduction
* of the information is only allowed for non-commercial uses. Selling,
* giving away or letting of the execution of the library is prohibited.
* The library can be distributed as part of your applications and libraries
* for execution provided this comment remains unchanged.
*
* Trademarks
* Jekejeke is a registered trademark of XLOG Technologies GmbH.
*/
:- use_module(library(basic/random)).
:- use_module(library(advanced/arith)).
:- use_module(library(runtime/distributed)).
:- use_module(library(misc/aggregate)).
/*****************************************************************/
/* Normal Test Cases */
/*****************************************************************/
rand :-
seeds(120, X),
aggregate_all(sum(Y), sequence(120, X, Y), _).
rand2 :-
balance(( seeds(120, X),
aggregate_all(sum(Y), sequence(120, X, Y), _)), 2).
rand4 :-
balance(( seeds(120, X),
aggregate_all(sum(Y), sequence(120, X, Y), _)), 4).
rand8 :-
balance(( seeds(120, X),
aggregate_all(sum(Y), sequence(120, X, Y), _)), 8).
/*****************************************************************/
/* Some Helpers */
/*****************************************************************/
% seeds(+Integer, -Integer)
seeds(N, X) :-
random_new(666, R),
between(1, N, _),
random_next(R, 1000, X).
% seeds(+Integer, +Integer, -Integer)
sequence(N, S, X) :-
T is S*1000,
random_new(T, R),
between(1, N, _),
random_next(R, 1000, X).