Re: PRNG for Lua 4.0?

[Michael Horvath <mikh2161@...>]

FYI the game is running Lua 4.0 not 4.01 as far as I can tell.


Mike

On Mon, Sep 9, 2013 at 10:08 PM, Michael Horvath <mikh2161@gmail.com> wrote:
> Here's the code again.
>
> --Linear Congruential Generator
> function lcg(s, r)
>     local temp = {}
>     function temp:random(a, b)
>         local y = mod(self.a * self.x + self.c, self.m)
>         self.x = y
>         if not a then
>             return y / 65536
>         elseif not b then
>             if a == 0 then
>                 return y
>             else
>                 return 1 + mod(y, a)
>             end
>         else
>             return a + mod(y, b - a + 1)
>         end
>     end
>     function temp:randomseed(s)
>         if not s then
>             s = seed()
>         end
>         self.x = mod(s, 2147483648)
>     end
>     if r then
>         --from Numerical Recipes
>         if r == 'nr' then
>             temp.a = 1664525
>             temp.c = 1013904223
>             temp.m = 65536
>         --from MVC
>         elseif r == 'mvc' then
>             temp.a = 214013
>             temp.c = 2531011
>             temp.m = 65536
>         end
>     --from Ansi C
>     else
>         temp.a = 1103515245
>         temp.c = 12345
>         temp.m = 65536
>     end
>     temp:randomseed(s)
>     return temp
> end
>
> local R = lcg(0)
> print("wutwut =" .. R:random())
> print("wutwut =" .. R:random())
> print("wutwut =" .. R:random())
>
> On Mon, Sep 9, 2013 at 10:04 PM, Geoff Leyland
> <geoff_leyland@fastmail.fm> wrote:
>> On 10/09/2013, at 1:40 PM, Michael Horvath <mikh2161@gmail.com> wrote:
>>
>>> I copied what you typed but still get the bad results. Is it because I
>>> am working in Lua 4.0 not 5.0?
>>
>> Whoops, sorry, missed that.  I tested it with Lua 4.0.1 and it worked as expected.  Either there's something funny with the version of Lua in your game, or you've got a typo.  In any case, unless you post the code, it's hard to help.
>>
>>