Strange cell values in 2d array with the help of random

[Pixelwar]

I wanted to fill a grid with about 50% true and 50% false. This I do with random(100). Then I draw the grid on the screen, so I think the grid was filled nearly with same amount of false and true, but every time I tested the code the amount of true was giant compared with the amount of false.
I tried very long to fix the problem, but I found no solution.

[Ranguna259]

Everything looks alright except two things:
You don't need to do

Code: Select all

return grid

There's no need to do that. And second, the problem is in your draw code, you are multiplying the sides of your rectangle by x and y, replace:

Code: Select all

love.graphics.rectangle("fill", 7 * (x - 1), 7 * (y - 1), 7 * x, 7 * y)

with:

Code: Select all

love.graphics.rectangle("fill", 7 * (x - 1), 7 * (y - 1), 7, 7)

FYI: You don't realy need to do math.random(100), all you need to do is math.random(0,1) this will output 0 or 1.

Here's a fixed love file:

[arampl]

You can control the amount of random values using "shuffle" of pre-generated values. For example if you want 50% true and 50% false values you can achieve it like this:

Code: Select all

local rnd = {}

function shuffle(t)
	local n = #t
	while n >= 2 do
	-- n is now the last pertinent index
		local k = love.math.random(n) -- 1 <= k <= n
	-- Quick swap
		t[n], t[k] = t[k], t[n]
		n = n - 1
	end
end

function love.load()

	for i = 1, 50 do
		rnd[i] = true
	end

	for i = 51, 100 do
		rnd[i] = false
	end

end

function love.keypressed(key, isRepeat)
	if key == "escape" then
		love.event.quit()
	elseif key == " " then
		shuffle(rnd)
		print("*****************************")
		for i = 1, #rnd do
			print(i, rnd[i])
		end
	end
end

[Pixelwar]

Thanks, I'm stupid , because I thought that the love.graphics.rectangle works after the pattern x1,y1,x2,y2 and not after x,y,width,height.
EDIT: And thanks for the tip @arampl