When programming in Haskell (and especially when solving Project Euler problems, where suboptimal solutions tend to stress the CPU or memory needs) I\'m often puzz开发者_运维百科led why the program be
Hi i know there are similar questions. But maybe thare are any updates or new libraries in this area.
Can anyone explain this to me? I\'m using a recent version of the GHC. Prelude> let f x = 1/((x**2)-36)
UPDATE SOLVED I updated to Haskell Platform 2011.2.0.1and GHC 7.0.3 and now it works!! I have the following haskell file named \"webscrap2.hs\". I can execute \"runghc webscrap2.hs\" and it works f
Given: data Foo = FooString String … class Fooable a where --(is this a good way to name this?) toFoo :: a -> Foo
Given the program: import Debug.Trace main = print $ trace \"hit\" 1 + trace \"hit\" 1 If I compile with ghc -O (7.0.1 or higher) I get the output:
What is a \'nested\' pattern in Haskell. I hear the term everywhere but am not sure what the it actually means. How would you define it? Any examples?
I have a GADT defined like (abbreviated), {-# LANGUAGE StandaloneDeriving #-} data D t where C :: t -> D t
I know that I can cause a compile-time error by calling fail from a splice, but is it possible to only generate a warning? In particular I would like it to be possible to turn this warning into an err
I have made an image processing module that defines a Pixel type as a Color and Location. Pixel, Color, and Location derive Eq, as I may want to compare pixels between multiple images.
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