Questions regarding WinGHCi - Windows GUI for GHCi
WinGHCi is a simple GUI to run ghci (the Glasgow Haskell Interpreter) on Windows.
Resources:
Questions tagged [winghci]
46 questions
3
votes
2 answers
Haskell function that takes out last occurrence of input character
I'm having trouble writing this function that takes a character and a list of characters, then eliminates the last occurrence of that input character in the list. I was able to take out the first occurrence of the input character with my function…
T-Bird
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2
votes
1 answer
Hlint integration with (Win)GHCi
Using Hlint via the command prompt works for me, but I have problem trying to perform the GHCi integration.
http://community.haskell.org/~ndm/darcs/hlint/hlint.htm says that "the script is at hlint.ghci [link], and a copy is installed locally in…
efie
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2
votes
1 answer
Haskell: Creating record of list of string and pair of
How to create a record of list of string and, pair of in Haskell
I tried the following
For creating a record of list of string
data testList = test [string]
deriving (Show, Eq)
When I run it, it gives me the following error
Not a data…
veda
- 6,416
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2
votes
1 answer
How can I compare and return data using a list of data
I'm a newbie to Haskell and I'm struggling to find a way to use class member variables to return the member variable I am looking for. I have this data:
data Place = Place {name :: String,
north :: Float,
east ::…
Pepe
- 59
- 6
2
votes
2 answers
Haskell tuple not matching with function argument
I'm new to Haskell so it may be obvious but I did Prolog extensively so I'm perplex about this one...
When using GHCi, I created the following function (1):
Prelude> let find k t = head [v | (k',v) <- t, k == k'] -- Definiton of find
find :: Eq a1…
lintense
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- 3
2
votes
2 answers
Some issues when using WinGHCi
With WinGHCi, how can one implement the following code?
soma :: Int -> Int
soma 1 = aluno 1
soma n = aluno n + soma (n-1)
I am currently writing multiline code using
:{
...
:}
but that doesn't seem to solve the issue, in this case.
Also, why…
devoured elysium
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2
votes
3 answers
Haskell function that alternatively applies input unary functions
I am trying to write a Haskell function that takes two unary functions (f and g) and a list of numbers (ns) and alternatively applies those input functions f and g to the elements of the inputted list.
For example:
func double square [2, 3, 4, 5,…
T-Bird
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- 20
2
votes
2 answers
Rewriting zipWith function using list comprehension
I've rewritten the zipWith function using recursion, and now I am trying to rewrite it using list comprehension. I have run into quite a few binding errors and I know that my second line is incorrect. This is the function I have that works like…
T-Bird
- 187
- 1
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- 20
2
votes
1 answer
Haskel type declaration, function and tuple as arguments
I'm doing a haskell assignment for school. I want to make a function called MapTuple, wich maps a function with a tuple as its arguments for an array of tuple. Im declaring it on the following way:
MapTuple :: [(a,b)] -> (a -> b) -> [b]
the way i…
Emscape
- 75
- 8
2
votes
3 answers
Error to launch winghci shipped in haskell platform package 2012.2.0.0
Everytime I double click winghci.exe an error message CreateGHCiProcess failed with failed with error 2 pops. I assume the installation hasn't completed setting environment variables successfully since cmd C:\>ghci ends up with no command found…
Yang
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2
votes
1 answer
Haskell : hide function in module (i.e. make function usable only by other functions in same module)
suppose I have a file NecessaryModule.hs, which has the following internals :
module NecessaryModule where
addNumber1 :: Int -> Int -> Int
addNumber1 a b = a + b
addNumber2 :: Int -> Int -> Int
addNumber2 a b = a + b
When I do :
:load…
artella
- 5,068
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1
vote
0 answers
Error with winGHCi Not in Scope
I have just started programming Haskell using Haskell Platform. I'm running winGHCi 1.0.6.
I created a "basic.hs" file with the following code: square x = x * x
I create a folder under Haskell Platform and saved the "basic.hs" there. Then when I…
sree
- 33
- 4
1
vote
0 answers
How to install WinGHCi?
I used to learn Haskell before I uninstalled everything. Now, I downloaded the Haskell platform but it seems there's no WinGHCi. Any suggestion please to solve the issue?
I tried to install it manually but there is no .exe file.
Tn25zm
- 11
- 2
1
vote
1 answer
Input redirection in WinGHCi
I know I can do the following from a command prompt:
$ runghc WC < quux.txt
How do I do this in WinGHCi? I know I have to first load the file like this:
Prelude> :load WC
But then what? This doesn't work:
*Main> WC < quux.txt
:1:1:…
Paul Reiners
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1
vote
3 answers
Convert a list of digits to a number HASKELL
I want to make a function in haskell that given a list of single digits, i make the full number. I was thinking in using intensive lists and patrons, as the code it follows:
funcion5 (x:xs) = [y*(10^w) | y <- (x:xs) w]
The idea is, to go over the…
vps
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