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The randomseed function takes one number that is being used to
initialize the random number generator - otherwise, you'll always get
the same random numbers.

For example:

math.randomseed(os.time()) -- initialize based on actual time
for i=1,50 do print(math.random(100)) end -- generate random 50 random
numbers between 1 and 100

Check the manuals for accurate description though:


2010/1/16 Luciano de Souza <>:
> Hi all,
> I could not understand how to get a trully randomic integer. Suppose I need
> 50 randomic integers each time I call a function. Serching in documentation,
> I found two functions in Math module: math.random and math.randomseed.
> The first one is not what I want. Calling it, I got always the same 50
> numbers. In Pascal, before using random functions, it's necessary to call
> "randomize" which starts the randomic number generator. I don't know if it's
> also necessary in Lua.
> But I try to use math.randomseed. The first tesst is:
> print(math.randomseed(100))
> print(math.randomseed(0, 100))
> Despite no errors, I dindn't get anything. So I ask: how to obtain 50
> different integers each time I call the randoms functions?
> Luciano de Souza