7.7
pcg
| (require pcg) | package: pcg |
Permuted congruential generators (PCG) are a class of pseudo-random number generators (PRNGs) that provide high statistical quality whilst being fast, simple, and memory-efficient.
> (require pcg) > (define state (pcg 3912)) > (pcg-view state) 946363416
procedure
(pcg state) → natural?
state : natural?
Advances the state by 1 iteration.
Note that you should not use the return value directly in your program, instead, one must filter this value through pcg-view in order to get the statistical properties associated with PCG, otherwise the randomness is in accordance with an linear congruential generator (LCG).
This step uses the 64-bit LCG.
procedure
(pcg-view state) → natural?
state : natural?
Transform the state into its view.
The view is PCG-XSG-RR.
procedure
(pcg-decide state) → bool?
state : natural?
Transform the state into a boolean value.
Uses pcg-view and masks all but one bit.
> (require pcg) > (define state (pcg 3912)) > (pcg-decide state) #f