Module:Random - Revision history

Mr. Stradivarius: allow newline separators

2015-11-11T16:32:54Z

allow newline separators

← Previous revision		Revision as of 16:32, 11 November 2015
Line 187:		Line 187:
	-- Include an easy way to use spaces as separators.		-- Include an easy way to use spaces as separators.
	return ' '		return ' '
			elseif sep == 'newline' then
			-- Ditto for newlines
			return '\n'
	elseif type(sep) == 'string' then		elseif type(sep) == 'string' then
	-- If the separator is a recognised MediaWiki separator, use that. Otherwise use the value of sep if it is a string.		-- If the separator is a recognised MediaWiki separator, use that. Otherwise use the value of sep if it is a string.

Nakon: Changed protection level of Module:Random: High-risk Lua module ([Edit=Allow only template editors and admins] (indefinite) [Move=Allow only template editors and admins] (indefinite))

2015-08-01T19:54:00Z

Changed protection level of Module:Random: High-risk Lua module ([Edit=Allow only template editors and admins] (indefinite) [Move=Allow only template editors and admins] (indefinite))

← Previous revision	Revision as of 19:54, 1 August 2015
(No difference)

Mr. Stradivarius: use args.same instead of a same_number function, add a config option to set a good seed for wikis with a low edit rate

2013-12-02T07:21:17Z

use args.same instead of a same_number function, add a config option to set a good seed for wikis with a low edit rate

Show changes

Mr. Stradivarius: add limit parameter for lists, and optimise the p.item code slightly

2013-11-29T14:57:06Z

add limit parameter for lists, and optimise the p.item code slightly

← Previous revision		Revision as of 14:57, 29 November 2013
Line 154:		Line 154:
	--------------------------------------------------------------------------------------		--------------------------------------------------------------------------------------

	function p.randomizeArray(t)		function p.randomizeArray(t, limit)
	-- Randomizes an array. It works by iterating through the list backwards, each time swapping the entry		-- Randomizes an array. It works by iterating through the list backwards, each time swapping the entry
	-- "i" with a random entry. Courtesy of Xinhuan at http://forums.wowace.com/showthread.php?p=279756		-- "i" with a random entry. Courtesy of Xinhuan at http://forums.wowace.com/showthread.php?p=279756
			-- If the limit parameter is set, the array is shortened to that many elements after being randomized.
			-- The lowest possible value is 0, and the highest possible is the length of the array.
	setRandomSeed()		setRandomSeed()
	~~for~~ i = #t~~, 2, -1 do~~		local len = #t
			for i = len, 2, -1 do
	local r = math.random(i)		local r = math.random(i)
	t[i], t[r] = t[r], t[i]		t[i], t[r] = t[r], t[i]
	end		end
			if limit and limit < len then
⚫	return t
			local ret = {}
			for i, v in ipairs(t) do
			if i > limit then
			break
			end
			ret[i] = v
			end
			return ret
			else
		⚫	return t
			end
	end		end

Line 198:		Line 212:
	local function makeRandomList(args)		local function makeRandomList(args)
	local list = removeBlanks(args)		local list = removeBlanks(args)
	list = p.randomizeArray(list)		list = p.randomizeArray(list, tonumber(args.limit))
	return list		return list
	end		end
Line 206:		Line 220:
	setRandomSeed()		setRandomSeed()
	local list = removeBlanks(args)		local list = removeBlanks(args)
	if ~~#list~~ >= ~~1 then~~		local len = #list
			if len >= 1 then
	return list[math.random(~~#list~~)]		return list[math.random(len)]
	end		end
	end		end

Mr. Stradivarius: Protected Module:Random: High-risk Lua module ([Edit=Allow only autoconfirmed users] (indefinite) [Move=Allow only autoconfirmed users] (indefinite))

2013-11-29T14:26:00Z

Protected Module:Random: High-risk Lua module ([Edit=Allow only autoconfirmed users] (indefinite) [Move=Allow only autoconfirmed users] (indefinite))

← Previous revision	Revision as of 14:26, 29 November 2013
(No difference)

Mr. Stradivarius: don't assume that RAND_MAX is 2^31-1

2013-11-28T15:51:48Z

don't assume that RAND_MAX is 2^31-1

← Previous revision		Revision as of 15:51, 28 November 2013
Line 26:		Line 26:

	local function getBigRandom(l, u)		local function getBigRandom(l, u)
	-- Gets a random integer between l and u, and is not limited to RAND_MAX ~~(which here we assume is 2^31-1)~~.		-- Gets a random integer between l and u, and is not limited to RAND_MAX.
	local r = ~~math.random() + math.random() / 2147483648~~		local r = 0
			local n = 2^math.random(30) -- Any power of 2.
			local limit = math.ceil(53 / (math.log(n) / math.log(2)))
			for i = 1, limit do
			r = r + math.random(0, n - 1) / (n^i)
			end
	return math.floor(r * (u - l + 1)) + l		return math.floor(r * (u - l + 1)) + l
	end		end

Mr. Stradivarius: actually, the extra calls to math.random don't seem to be necessary - don't trust everything you read on the Internet

2013-11-28T09:42:19Z

actually, the extra calls to math.random don't seem to be necessary - don't trust everything you read on the Internet

← Previous revision		Revision as of 09:42, 28 November 2013
Line 14:		Line 14:
	-- and os.clock() (the time the program takes to run).		-- and os.clock() (the time the program takes to run).
	math.randomseed(mw.site.stats.edits + mw.site.stats.pages + os.time() + math.floor(os.clock() * 1000000000))		math.randomseed(mw.site.stats.edits + mw.site.stats.pages + os.time() + math.floor(os.clock() * 1000000000))

	-- Call math.random a few times to avoid getting the same first answer every time.
	math.random()
	math.random()
	math.random()
	end		end

Mr. Stradivarius: oops - stupid mistake in the comments, should be divided by, not modulus

2013-11-28T09:37:36Z

oops - stupid mistake in the comments, should be divided by, not modulus

← Previous revision		Revision as of 09:37, 28 November 2013
Line 67:		Line 67:
	-- To fix this, replace the line beginning with "local seed" with the following code:		-- To fix this, replace the line beginning with "local seed" with the following code:
	--		--
	-- local seed = math.floor(os.time() % 60)		-- local seed = math.floor(os.time() / 60)
	--		--
	-- This makes the seed change once a minute. (The "60" is the number of seconds between one seed and the next.)		-- This makes the seed change once a minute. (The "60" is the number of seconds between one seed and the next.)

Mr. Stradivarius: add a function that gets the same random number on every page.

2013-11-28T06:21:15Z

add a function that gets the same random number on every page.

Show changes

Mr. Stradivarius: tidy indents and remove confusing left-over comment

2013-11-28T04:09:26Z

tidy indents and remove confusing left-over comment

← Previous revision		Revision as of 04:09, 28 November 2013
Line 30:		Line 30:
	local function bigRandom(l, u)		local function bigRandom(l, u)
	-- Gets a random integer between l and u, and is not limited to RAND_MAX (which here we assume is 2^31-1).		-- Gets a random integer between l and u, and is not limited to RAND_MAX (which here we assume is 2^31-1).
	local r = math.random() + math.random() / 2147483648		local r = math.random() + math.random() / 2147483648
	return math.floor(r * (u - l + 1)) + l		return math.floor(r * (u - l + 1)) + l
	end		end

Line 141:		Line 141:
	local ret = {}		local ret = {}
	for k, v in pairs(t) do		for k, v in pairs(t) do
	if type(k) == 'number' then ~~-- Make sure we have no non-string portal names.~~		if type(k) == 'number' then
	table.insert(ret, k)		table.insert(ret, k)
	end		end