I want to write a function in haskel开发者_StackOverflow中文版l which would not mind in what order I provide it its argument, for example, I want to unify these two functions
I am trying to capture the stdin and stdout from runProcess into a string for analysis. However, setting up the handles seems to be rather difficult.I wandered into GHC.IO.Handle, and that seems to b
So here is a nested list [[1, 2], [3, 4]] I want to wrap it in a type called Matrix, and make it an instance of the classes Eq, Num, and Show
I\'m trying to write a function in haskell that reverses lists recursively. I wrote a helper function that takes the original list and an empty list then transfers elements from the first one to the o
While reading the QuickCheck Manual, I came across the following example: prop_RevRev xs = reverse (reverse xs) == xs
I\'ve got the feeling that the answer is yes, and that\'s not restricted to Haskell.For example, tail-call optimization changes memory requirements from O(n) to O(l), right?
It\'s my first time to use data types in Haskell. Got a problem and I don\'t know how to improve the code.
I\'m trying to write a function that takes an IO Bool and does stuff based on what this is, but I can\'t figure out how to evaluate the IO Bool. I tried saying do cond and do {cond==True} but got the
I have a polynomial data Poly a = Poly [a] I would like to be able to do something like fmap (take3) polynomial but I can\'t since Poly isn\'t really a functor in that the f I use in fmap can only
I\'ve been 开发者_开发百科struggling with this for a while. I\'m solving the longest common subsequence problem in Haskell as a learning exercise.
加载中,请稍侯......