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ANSI Common Lisp  12 Numbers 12.2 Dictionary of Numbers
| 12.2.40 make-random-state |
Function |
- Syntax:
-
make-random-state
&optional state
 new-state
- Arguments and Values:
-
state - a random state, or nil, or t.
The default is nil.
new-state - a random state object.
- Description:
-
Creates a fresh object of type random-state suitable
for use as the value of *random-state*.
If state is a random state object,
the new-state is a copy5 of that object.
If state is nil,
the new-state is a copy5 of the current random state.
If state is t,
the new-state is a fresh random state object
that has been randomly initialized by some means.
- Examples:
-
(let* ((rs1 (make-random-state nil))
(rs2 (make-random-state t))
(rs3 (make-random-state rs2))
(rs4 nil))
(list (loop for i from 1 to 10
collect (random 100)
when (= i 5)
do (setq rs4 (make-random-state)))
(loop for i from 1 to 10 collect (random 100 rs1))
(loop for i from 1 to 10 collect (random 100 rs2))
(loop for i from 1 to 10 collect (random 100 rs3))
(loop for i from 1 to 10 collect (random 100 rs4))))
((29 25 72 57 55 68 24 35 54 65)
(29 25 72 57 55 68 24 35 54 65)
(93 85 53 99 58 62 2 23 23 59)
(93 85 53 99 58 62 2 23 23 59)
(68 24 35 54 65 54 55 50 59 49))
- Exceptional Situations:
-
Should signal an error of type type-error if state is not a random state, or nil, or t.
- See Also:
-
random, *random-state*
- Notes:
-
One important use of make-random-state is to allow the same
series of pseudo-random numbers to be generated many times within a
single program.
- Allegro CL Implementation Details:
-
See cl:random and cl:make-random-state for information on the Allegro CL implementation of make-random-state. Note
the links are to the documentation for the current Allegro CL
version. Replace /current/ in the URL with the Allegro CL version
number to see similar documentation is earlier releases.
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