[Haskell-cafe] Memoisation

I have a backtracking algorithm that I need to memoise with. Rather than go into the intricacies of the algorithm, I figure (and hope) the factorial function is trivial enough to point out my problem. Simply, suppose I wish to calculate the factorial of 10, then "later" the factorial of 5. I have already calculated the factorial of 5, but now I must do it again. I have thought of various ways of preventing this; perhaps passing an Array in a state monad. I'm wondering if there is a general solution for this kind of problem. Thanks for any tips. -- Tony Morris http://tmorris.net/