So you say you want a random number?
Posted: Sat Mar 07, 2015 9:04 pm
So I was curious about the distribution of random numbers, so I created a simple script to test out the normal distribution and the default distribution.
Here is the results (from a previous revision):
(small sample set):
(large sample set):
Feel free to use this code to play around with it yourself. First four lines are options for you to choose from. Its binned into Size bins. The first and last may contain overflow from the normal distribution depending on your StdDev and Size because I clamp out of range values (rather than discard).
Here is the results (from a previous revision):
(small sample set):
(large sample set):
Feel free to use this code to play around with it yourself. First four lines are options for you to choose from. Its binned into Size bins. The first and last may contain overflow from the normal distribution depending on your StdDev and Size because I clamp out of range values (rather than discard).
Code: Select all
Seed = 2024561111
StdDev = 10
NumbersPerSecond = 1000000
Size = 100
rndNormals = {}
rndNumbers = {}
count = 0
function love.load()
rndGNormal = love.math.newRandomGenerator(Seed)
rndGNumbers = love.math.newRandomGenerator(Seed)
for i=0,Size do
rndNormals[i] = 0
rndNumbers[i] = 0
end
end
function love.update(dt)
local numcount = NumbersPerSecond*dt
for i=1,numcount do
local na,nb = rndGNormal:randomNormal(StdDev,Size/2),rndGNumbers:random(Size)
local norm = math.max(math.min(math.floor(na),Size),0)
local numb = math.max(math.min(math.floor(nb),Size),0)
rndNormals[norm] = rndNormals[norm]+1
rndNumbers[numb] = rndNumbers[numb]+1
end
count = math.floor(count + numcount)
end
function drawGraph(g,ox,oy,height)
love.graphics.setLineWidth(4)
local max = math.max(unpack(g))
for i=0,#g do
local x = 5*(i-1) + ox
local y = oy+height
local lh = height*(g[i]/max)
love.graphics.line(x,y,x,y-lh)
end
end
function love.draw()
love.graphics.print("Normal Random, stddev= "..tostring(StdDev).." size= "..tostring(Size),10,0)
drawGraph(rndNormals,10,15,250)
love.graphics.print("Default Random",10,270)
drawGraph(rndNumbers,10,285,250)
love.graphics.print("Count "..tostring(count),400,285+250+10)
end