Recipe: Randomeer

created by LociOiling

Profile

• Name: Randomeer
• ID: 101667
• Shared with: Public
• Parent: None
• Children: None
• Created on: December 09, 2015 at 06:40 AM UTC
• Updated on: December 09, 2015 at 06:40 AM UTC
• Description:

  Randomeer generates random ones and zeroes. The scriptlog from this recipe can be used as input to the standalone Lua script LuaRandom2 to generate a bitmap in PNG format.

Code

--[[
    Randomeer

    This script generates a random 512x512 black and white bitmap,
    as 512 lines of 512 random ones and zeroes.

    The scriptlog output from this recipe can be input to the standalone
    script LuaRandom2.lua to convert the bitmap to png format.

    The goal is to visually assess the quality of the random
    number generator. 

    See https://www.random.org/analysis/#visual for a detailed example

    This script is based on the PHP script found in http://boallen.com/random-numbers.html

    revision history
    ----------------
    2015/12/08 -- LociOiling -- new function

]]--

DEBUG = false

-- Module Random
-- Tvdl, 01-11-2012
Randomseed=os.time()%1000000
if DEBUG then
    print ( "seed = " .. Randomseed )
end

function Seedrandom()
    math.randomseed(Randomseed)
    math.random(100) -- Because the first is not random
end
Seedrandom()

rando = ""
rands = {}

for ii = 1, 512 do
    for jj = 1, 512 do
        rands [ #rands +  1 ] = math.random ( 0, 1 )
    end
end

if DEBUG then
    print ( #rands .. " random numbers generated" )
end

kk = 0 
ll = 0
for ii = 1, 512 do
    rando = ""
    for jj = 1, 512 do
        kk = kk + 1 
        rando = rando .. rands [ kk ] 
    end
    ll = ll + 1
    print ( rando )
end
if DEBUG then
    print ( ll .. " lines of 512 generated" )
end

Comments

[LociOiling]

Randomeer generates 512 lines, each containing 512 random ones and zeroes.

The scriptlog from Randomeer can be input to the standalone Lua program LuaRandom2, which has been shared as a recipe. LuaRandom2 generates a PNG bitmap, which can then be compared to one generated by the standalone program LuaRandom.

The goal is to visually assess the quality of the random number generator. The output from this script can be compared to the output of the LuaRandom script.

See https://www.random.org/analysis/#visual for a detailed example