Hi, I¹m a newbie looking to get my head around using the State Monad for random number generation. I¹ve written non-monad code that achieves this no problem. When attempting to use the state monad I can get what I know to be the correct initial value and state, but can¹t figure out for the life of me how to then increment it without binding more calls there and then. Doing several contiguous calls is not what I want to do here ­ and the examples I¹ve read all show this (using something like liftM2 (,) myRandom myRandom). I want to be able to do: Get_a_random_number < a whole load of other stuff > Get the next number as defined by the updated state in the first call <some more stuff> Get another number, and so on. I get the first number fine, but am lost at how to get the second, third, forth etc without binding there and then. I just want each number one at a time where and when I want it, rather than saying give 1,2,10 or even Œn¹ numbers now. I¹m sure it¹s blindly obvious! Note: I¹m not using Haskell¹s built in Random functionality (nor is that an option), I¹ll spare the details of the method I¹m using (NRC¹s ranq1) as I know it works for the non-Monad case, and it¹s irrelevent to the question. So the code is: ranq1 :: Word64 -> ( Double, Word64 ) ranq1 state = ( output, newState ) where newState = ranq1Increment state output = convert_to_double newState ranq1Init :: Word64 -> Word64 ranq1Init = convert_to_word64 . ranq1Increment . xor_v_init -- I¹ll leave the detail of how ranq1Increment works out for brevity. I know this bit works fine. Same goes for the init function it¹s just providing an initial state. -- The Monad State Attempt getRanq1 :: State Word64 Double getRanq1 = do state <- get let ( randDouble, newState ) = ranq1 state put newState return randDouble _________ And then in my main _________ -- 124353542542 is just an arbitrary seed main :: IO() main = do let x = evalState getRanq1 (ranq1Init 124353542542) print (x) As I said this works fine; x gives me the correct first value for this sequence, but how do I then get the second and third without writing the giveMeTenRandoms style function? I guess what I want is a next() type function, imperatively speaking. Many thanks for any help, Phil.