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Published: 19/02/2018If I have an expression in conjunctive normal form, represented as a list of new data type data Expression = Unnegated String  Negated String for example [[Unnegated "x", Negated "y", Unnegated "z"], ... Read moreSource: stackoverflow.com


Published: 19/02/2018I am trying to implement Fisher's exact test in Haskell, so given four natural numbers a, b, c, and d, I want to calculate the formula: p=((a+b)! * (a+c)! * (b+d)! * (c+d)!) / (a! * b! * c! * d! * (a+ ... Read moreSource: stackoverflow.com

Published: 19/02/2018I'm new to Haskell, I'm trying to map a check function that checks if a file exists and looks like this: check :: FilePath > IO Bool To the argv from Main, like so: main :: IO Bool main = do { arg ... Read moreSource: stackoverflow.com

Published: 18/02/2018Generics and Reverse Generics for Pharo Generic programming is a mechanism for reusing code by abstracting specific types used in classes and programs. In this paper, we present a mechanism for addin ... Read moreSource: lambdatheultimate.org

Published: 18/02/2018So, my package.yaml includes  hint package. Then I try to stack build my project. Log: Configuring hint0.7.0... Preprocessing library for hint0.7.0.. Building library for hint0.7.0.. [ 1 of 18] Co ... Read moreSource: stackoverflow.com

Published: 18/02/2018Say, I need System.Eval.Haskell . Or whatever else. How do I know which package I should specify in my package.yaml ? When I go to the https://hackage.haskell.org/package/plugins1.5.7/docs/SystemEva ... Read moreSource: stackoverflow.com

Published: 18/02/2018In Haskell we have list generators, such as: [x+y  x<[1,2,3], y<[1,2,3]] with which we get [2,3,4,3,4,5,4,5,6] is it possible to have a set generator, which automatically doesn't add an eleme ... Read moreSource: stackoverflow.com

Published: 18/02/2018I'm using Happstack to receive some parameters from an HTTP request then pass these parameters to a function that will retrieve data from the database and return this data in the HTTP response as foll ... Read moreSource: stackoverflow.com

Published: 18/02/2018I'm developing a class representing key/value mappings, and I've got a function which is basically like alterF : class C t where ... alterF :: Functor f => (Maybe (Value t) > f (Maybe (Value t) ... Read moreSource: stackoverflow.com

Published: 18/02/2018I understand the definition of >>= in term of join xs >>= f = join (fmap f xs) which also tells us that fmap + join yields >>= I was wondering if for the List monad it's possible to ... Read moreSource: stackoverflow.com

Published: 18/02/2018I am currently developing a web server using the Yesod framework for a course project. I am new to Haskell and I am fascinated by how different it is to everything else I know regarding programming la ... Read moreSource: stackoverflow.com

Published: 18/02/2018According to Wikipedia, the translation from lambda calculus to combinatory logic is trivial. Concatenative programming languages can rely solely on a stack for memory allocation. What's stopping GHC ... Read moreSource: stackoverflow.com

Published: 18/02/2018I am implementing a nondeterministic finite automaton in Haskell and I am trying to implement the function that calculates the epsilon closure. To this purpose the NFA is implemented as: data Transact ... Read moreSource: stackoverflow.com

Published: 18/02/2018considering the code below which returns the factorial of a number: factorial n = go n 1 where go n ret  n > 1 = go (n1) (ret * n)  otherwise = ret how can I print 'n' in every single recursive ... Read moreSource: stackoverflow.com

Published: 18/02/2018As a CS student, I am asked to write a compiler in a functional language with LLVM. I chose Haskell, despite the fact that I am very new to it and that I don't understand everything in source code exa ... Read moreSource: stackoverflow.com

Published: 17/02/2018I'm looking for shared concurrent vectors in Haskell, so I would accept an answer that points to a performant solution other than what I'm discussing here, which is to combine the vector library with ... Read moreSource: stackoverflow.com

Published: 17/02/2018Here are some simple Falgebras for lists. They work with the cata function from the recursionschemes library. import Data.Functor.Foldable algFilterSmall :: ListF Int [Int] > [Int] algFilterSmal ... Read moreSource: stackoverflow.com

Published: 17/02/2018I am currently working with quite dirty project written in Haskell. It contains lots of code like: try_parse_parameters (p:ps) kvps options = let maybeKvp = try_parse_kvp p in if isJust maybeKvp then ... Read moreSource: stackoverflow.com

Published: 17/02/2018On a website, I found the following challenge and got caught and I don't know how to solve it. We need to define the following function: isSquare :: (Num a, Ord a) => (a,a) > (a,a) > (a,a) ... Read moreSource: stackoverflow.com

Published: 17/02/2018I'm trying to find out en element at a particular position in a list using recursive function. The function takes 2 parameter, an int & list. int is the position of the item in the list. I have sp ... Read moreSource: stackoverflow.com

Published: 17/02/2018In Haskell, I want to define a function recursively and using summation there, what I have is this: partitions n m l = gfunct n m l where gfunct n m l  n == 0 && m == 0 = 0  n < m  m == ... Read moreSource: stackoverflow.com
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