<function name="random" parent="math" type="libraryfunc"> <description> When called without arguments, returns a uniform pseudo-random real number in the range 0 to 1 which includes 0 but excludes 1. When called with an integer number m, returns a uniform pseudo-random integer in the range 1 to m inclusive. When called with two integer numbers m and n, returns a uniform pseudo-random integer in the range m to n inclusive. See also <page>math.Rand</page> </description> <realm>Shared and Menu</realm> <args> <arg name="m" type="number" default="nil">If m is the only parameter: upper limit.&amp;lt;br /&amp;gt;⤶ If n is also provided: lower limit. <arg name="m" type="number" default="nil">⤶ If m is the only parameter: upper limit. ⤶ If n is also provided: lower limit.⤶ If provided, this must be an integer.</arg> <arg name="n" type="number" default="nil">Upper limit. If provided, this must be an integer.</arg> </args> <rets> <ret name="" type="number">Random value</ret> </rets> </function> <example> <description>Generate a random number between 1 and 400 with both math.random and math.Rand.</description> <code> print(math.random(1,400)) print(math.Rand(1,400)) </code> <outputfixedwidth>Fixed width</outputfixedwidth> <output> 317 1.0162317198768 </output> </example> <example> <description>Select a random key from a table, where the keys have a different probability of being selected.</description> <code> function GetWeightedRandomKey(tab) local sum = 0 for _, chance in pairs(tab) do sum = sum + chance end local select = math.random() * sum for key, chance in pairs(tab) do select = select - chance if select &lt; 0 then return key end if select < 0 then return key end end end -- Example usage: local fruit = { Grape = 4.5, Orange = 20, Banana = 3.14 } for i = 1, 5 do print(GetWeightedRandomKey(fruit)) end </code> <outputfixedwidth>Fixed width</outputfixedwidth> <output> Banana Grape Banana Orange Orange </output> </example>