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- Subject: Re: Getting randomic integers
- From: Majic <majic.one@...>
- Date: Sun, 17 Jan 2010 00:20:57 -0800
Yes yes, was just hoping to get random numbers more than once a second
:) I don't think that's portable though.... oh well.
On Sat, Jan 16, 2010 at 11:13 PM, Gé Weijers <ge@weijers.org> wrote:
> These integers are not *truly* random, they are generated deterministically
> using some algorithm chosen because it's fast, and the quality depends on
> the particular generator chosen by whoever created it in your C library.
>
> Don't use them for anything relating to cryptography. They may not even be
> good enough for use in operations research, it may be easy to find patterns
> in the stream.
>
> Ge'
>
>
> On 01/16/2010 03:05 PM, Luciano de Souza wrote:
>
> It works exactly as I want. I used math.random, but always got the same
> numbers, but if I call math.randomseed(os.time()) before, I always got
> different numbers. Thank you very much!
>
>
>
> ----- Original Message ----- From: "Eike Decker" <zet23t@googlemail.com>
> To: "Lua list" <lua@bazar2.conectiva.com.br>
> Sent: Saturday, January 16, 2010 8:28 PM
> Subject: Re: Getting randomic integers
>
>
> 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:
> http://www.lua.org/manual/5.1/manual.html#pdf-math.random
>
> Eike
>
> 2010/1/16 Luciano de Souza <luchyanus@predialnet.com.br>:
>
> 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
>
>
>
> --
> Gé Weijers email: ge@weijers.org