Random.txt

*vital/Random.txt*	Random utility frontend library

Maintainer: thinca <thinca+vim@gmail.com>

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CONTENTS				*Vital.Random-contents*

INTRODUCTION			|Vital.Random-introduction|
INTERFACE			|Vital.Random-interface|
  FUNCTIONS			  |Vital.Random-functions|
OBJECTS				|Vital.Random-objects|
  Random Object			  |Vital.Random-Random|
  Generator Object		  |Vital.Random-Generator|



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INTRODUCTION				*Vital.Random-introduction*

*Vital.Random* is a Random utility frontend library.

					*Vital.Random-synopsis*
>
	let s:V = vital#{plugin-name}#new()
	let s:Random = s:V.import('Random')

	" Generate a random number.
	echo s:Random.next()
	" => 854122453

	" Generate 1 or more and 6 or less random number.
	echo s:Random.range(1, 7)
	" => 1

	" Get a sample value from a list.
	echo s:Random.sample(range(10))
	" => 8

	" Shuffle a list.
	echo s:Random.shuffle(range(10))
	" => [2, 3, 0, 9, 1, 6, 7, 5, 8, 4]

	" Make a new Random Object.
	let s:R = s:Random.new()

	" Make a new Random Object with Generator.
	let s:R = s:Random.new('Xor128')

	" Make a new Random Object with seed.
	let s:seed = s:Random.next()
	let s:R = s:Random.new('', s:seed)
	echo s:R.next(3)
	" => [-962538367, 815574453, 655578969]

	" Reset the seed.
	call s:R.seed(s:seed)
	echo s:R.next(3)
	" => [-962538367, 815574453, 655578969]



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INTERFACE				*Vital.Random-interface*

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FUNCTIONS				*Vital.Random-functions*

new([{generator} [, {seed}]])	*Vital.Random.new()*
	Create a new Random Object(|Vital.Random-Random|).
	{generator} is a generator name or a generator object.
	A name of a generator is a portion of the last of a module name like
	"Random.*".  For example, "Xor128".
	See |Vital.Random-Generator| about a generator object.
	If {seed} is omitted, this is created from |Vital.Random.next()|.

make_seed()			*Vital.Random.make_seed()*
	Make a seed from current time and so on.
	This does not assume being used continuously.
	This is used to initialize the internal common random generator.
	You can use |Vital.Random.next()| to initialize your Random Object.

next()				*Vital.Random.next()*
next({n})
	Shortcut to |Vital.Random-Random.next()|.

seed({seeds})			*Vital.Random.seed()*
	Shortcut to |Vital.Random-Random.seed()|.

generate_canonical()		*Vital.Random.generate_canonical()*
	Shortcut to |Vital.Random-Random.generate_canonical()|.

range({to})			*Vital.Random.range()*
range({from}, {to})
	Shortcut to |Vital.Random-Random.range()|.

bool()				*Vital.Random.bool()*
	Shortcut to |Vital.Random-Random.bool()|.

sample({list})			*Vital.Random.sample()*
sample({list}, {n})
	Shortcut to |Vital.Random-Random.sample()|.

shuffle({list})			*Vital.Random.shuffle()*
	Shortcut to |Vital.Random-Random.shuffle()|.



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OBJECTS					*Vital.Random-objects*

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Random Object			*Vital.Random-Random*

A Random Object generates some useful random numbers from a generator.
You can choose the generator to be used freely.

Random.next()			*Vital.Random-Random.next()*
Random.next({n})
	Get a next random number or {n} next random numbers in the sequence.

Random.seed({seeds})		*Vital.Random-Random.seed()*
	Set seeds by a |Number| or a |List| of numbers.
>
	" Create two objects which generate the same random number sequence.
	let s:player1 = s:Random.new()
	let s:player2 = s:Random.new()
	let s:seed = s:Random.next()
	call s:player1.seed(s:seed)
	call s:player2.seed(s:seed)

Random.generate_canonical()	*Vital.Random-Random.generate_canonical()*
	Get a random float number in [0.0, 1.0).
>
	echo s:R.generate_canonical()
	" 0.618474
	echo s:R.generate_canonical()
	" 0.350191

Random.range({to})		*Vital.Random-Random.range()*
	Get a random number in [0, {to}).
	If {to} is a |Number|, returns a |Number|.
	If {to} is a |Float|, returns a |Float|.
>
	echo s:R.range(5)
	" 4
	echo s:R.range(5)
	" 0

Random.range({from}, {to})
	Get a random number in [{from}, {to}).
	If {from} and {to} is a |Number|, returns a |Number|.
	If {from} or {to} is a |Float|, returns a |Float|.
>
	echo s:R.range(1, 6)
	" 1
	echo s:R.range(1, 6)
	" 3

Random.bool()			*Vital.Random-Random.bool()*
	Get a random number in 0 or 1.
>
	echo s:R.bool()
	" 1
	echo s:R.bool()
	" 0

Random.sample({list})		*Vital.Random-Random.sample()*
Random.sample({list}, {n})
	Choose a random element or {n} random elements from the {list}.
>
	echo s:R.sample(range(5))
	" 1
	echo s:R.sample(range(5), 3)
	" [3, 1, 4]

Random.shuffle({list})		*Vital.Random-Random.shuffle()*
	Shuffle the {list}.
>
	let s:list = range(5)
	echo s:R.shuffle(s:list)
	" [3, 1, 0, 2, 4]
	echo s:list
	" [3, 1, 0, 2, 4]

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Generator Object		*Vital.Random-Generator*

A Generator Object generates random number sequence.

Generator.next()		*Vital.Random-Generator.next()*
	Get the next random number in the sequence.

Generator.min()			*Vital.Random-Generator.min()*
	Get the smallest value in the output range.

Generator.max()			*Vital.Random-Generator.max()*
	Get the largest value in the output range.

Generator.seed({seeds})		*Vital.Random-Generator.seed()*
	Set seeds by a |List| of numbers which initializes the generator.


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