LuaForWindows_v5.1.4-46

[mahdi-hajian]

math.random() is wrong

for example
math.random(200)
is only 1
or
math.random(200,300)
is only 200

[mahdi-hajian]

in last version is wrong too
Lua for Windows v5.1.5-52 Released

[TFWol]

That's a lua problem.

-- you only get 200
count = 0
while count < 100 do
  number = math.random(200, 300)
  print(number)
  if number == 200 then
    break
  end
  count = count + 1
end

-- works properly
math.randomseed(os.time())

count = 0
while count < 100 do
  number = math.random(200, 300)
  print(number)
  if number == 200 then
    break
  end
  count = count + 1
end

REF:
https://stackoverflow.com/questions/18199844/lua-math-random-not-working

[JJSax]

This issue is more than a randomseed issue.

print(os.time()) -- this prints a different time each time. 
math.randomseed(os.time())
for i = 1, 5 do 
  print(math.random(1, 100)) 
end

outputs this, notice the first number on every test. Each test was done several seconds apart from each other to ensure os.time() returned a new number.

-- test 1
42
35
28
93
33
-- test 2
42
68
82
66
65
-- test 3
42
34
91
13
28
-- test 4
42
66
46
87
59
-- test 5
42
99
100
60
91
-- test 6
42
65
9
7
54
-- test 7
42
98
64
80
85
-- test 8
42
30
18
54
17
-- test 9
42
62
36
48
43

Running the same code on several online compilers this issue doesn't happen. Those compilers use Lua 5.4, one allowed me to use down to lua 5.3,2 and the issue was not a thing with that one either.

It's possible this issue existed in Lua 5.1 which this project uses.