Random number generation

In vanilla lua, before generating a random number you have to use math.randomseed(os.time()) In order to stop from generating the same random number over and over again. The main problem with this is that if you are generating 50 random numbers in a row in say a for loop, they will all be the same because in the time it takes to generate all of them os.time() does not change. However, in computercraft, if you do something like

for i=1, 50 do
print(math.random(1,2))
end

All the random number will be different, which is not the case in regular lua, as I explained. How does computercraft achieve this? I looked through the source and could not find any redefinition of math.random (At least in the lua section) yet it seems to work differently. How is this achieved, and how can I do it in vanilla lua?


P.S. We have a stackexchange tag now :D/>

If you generate multiple random numbers after each other without resetting the seed, all those numbers will be diffrent.

You only have to set the seed once to generate a random sequence of numbers, even in "vanilla" Lua.

Then there must be something wrong with my lua installation or code, because:

numofheads = 0
k= 1000
for i = 1, k do
	math.randomseed(os.time())
	l = math.random(1, 2)
    if l == 1 then
    	numofheads = numofheads+1
    end
end
print(numofheads)

Always returns 0 or 1000. Is there a reason for this?

EDIT: Ah, I see the problem. I have to set the randomseed before the loop. Thanks for the clarification.