Movatterモバイル変換

Value Type:

arandom state.

Initial Value:

implementation-dependent.

Description:

Thecurrent random state, which is used, for example, by thefunctionrandom when arandom state is not explicitly supplied.

Examples:

 (random-state-p *random-state*) =>true (setq snap-shot (make-random-state)) ;; The series from any given point is random, ;; but if you backtrack to that point, you get the same series. (list (loop for i from 1 to 10 collect (random))       (let ((*random-state* snap-shot))         (loop for i from 1 to 10 collect (random)))       (loop for i from 1 to 10 collect (random))       (let ((*random-state* snap-shot))         (loop for i from 1 to 10 collect (random))))=>  ((19 16 44 19 96 15 76 96 13 61)    (19 16 44 19 96 15 76 96 13 61)    (16 67 0 43 70 79 58 5 63 50)    (16 67 0 43 70 79 58 5 63 50))

Affected By:

Theimplementation.

random.

See Also:

make-random-state,random,random-state

Notes:

Binding*random-state* to a differentrandom stateobject correctly saves and restores the oldrandom stateobject.