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Search found 17 results on 1 pages for 'dmindreader'.

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• backtracking in haskell

  - by dmindreader

  I have to traverse a matrix and say how many "characteristic areas" of each type it has. A characteristic area is defined as a zone where elements of value n or n are adjacent. For example, given the matrix: 0 1 2 2 0 1 1 2 0 3 0 0 There's a single characteristic area of type 1 which is equal to the original matrix: 0 1 2 2 0 1 1 2 0 3 0 0…

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• GHCi error: Not in scope

  - by dmindreader

  I'm trying to compile this function from Learn You a Haskell for Great Good. removeNonUppercase st = [ c | c <- st, c `elem` ['A'..'Z']] by placing it into a removeNonUpperCase.hs file. It compiles fine, but when passing the argument: ghci> removeNonUppercase "Hahaha! Ahahaha!" the compiler says: <interactive>:1:0: Not in…

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• Learning Pascal FC

  - by dmindreader

  I'm looking for tutorials and examples on Pascal FC's channels and rendesvouz mechanisms.

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• Using pfccomp or pint to run Pascal-FC programs

  - by dmindreader

  I'm using the Pascal FC implementation for Windows Vista found on http://www-users.cs.york.ac.uk/burns/pf.html I'm trying to run the dining philophers problem found on the link but I don't get how to make the compiler work. Screenshot

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• Prolog newbie question: Making a procedure to print Hello World

  - by dmindreader

  I want to load this simple something into my Editor: Write:-repeat,write("hi"),nl,fail. So that it prints "hi". What should I do? I'm currently trying to do File->New and Saving a file named Write into E:\Program Files\pl\xpce\prolog\lib When doing the query: ?-Write. It's printing: 1 ?- Write. % ... 1,000,000 ............ 10,000,000…

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• Understanding this Pascal-FC threaded code

  - by dmindreader

  **Program Parcial2; type buffer = channel of integer; var buffers : array [1..2] of buffer; val:integer; process sleeper (id:integer); var i : integer; begin for i:=1 to 10 do begin sleep (random(10*id)); **buffers (id):any;** end; end; process troll; begin **buffers[1]: random(10);** end;** What are buffers(id):any…

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• Prolog n00b question: Doing whatever

  - by dmindreader

  I want to load this simple something into my Editor: Write:-repeat,write("hi"),nl,fail. So that it prints "hi". What should I do? I'm currently trying to do File->New and Saving a file named Write into E:\Program Files\pl\xpce\prolog\lib When doing the query: ?-Write. It's printing: 1 ?- Write. % ... 1,000,000 ............…

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• Is there a way to make swi prolog print its currently working inference tree?

  - by dmindreader

  It would be a great help on my course.

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• Haskell: What's the type of this function?

  - by dmindreader

  mifun s = foldr op 0 s where op x r = head x + r Is there a way to make ghci tell me?

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• Concurrency: What's a channel?

  - by dmindreader

  I'm studying pascal-fc for a concurrency test. I'm familiar with Java's threads and its monitors. I don't understand the role of channels, please explain.

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• Understanding this matrix transposition function in Haskell

  - by dmindreader

  This matrix transposition function works, but I'm trying to understand its step by step execurtion and I don't get it. transpose:: [[a]]->[[a]] transpose ([]:_) = [] transpose x = (map head x) : transpose (map tail x) with transpose [[1,2,3],[4,5,6],[7,8,9]] it returns: [[1,4,7],[2,5,8],[3,6,9]] I don't get…

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• Understanding Haskell's filter

  - by dmindreader

  I understand that Haskell's filter is a high order function (meaning a function that takes another function as a parameter) that goes through a list checking which element fulfills certain boolean condition. I don't quite understand its definition: filter:: (a->Bool)->[a]->[a] filter p [] = [] filter p (x:y) | p x =…

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• What kind of UML diagram is this?

  - by dmindreader

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• What is wrong with this SimPy installation?

  - by dmindreader

  Alright, I have tried a bunch of times the python setup.py install command from my command prompt, and this is what I'm getting: SCREEN And when trying this: from SimPy.Simulation import * on Idle, I get this: Traceback (most recent call last): File "C:/Python30/pruebas/prueba1", line 1, in <module> from…

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• Uva's 3n+1 problem

  - by dmindreader

  I'm solving Uva's 3n+1 problem and I don't get why the judge is rejecting my answer. The time limit hasn't been exceeded and the all test cases I've tried have run correctly so far. import java.io.*; public class NewClass{ /** * @param args the command line arguments */ public static void…

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• NullPointerException in Console's readLine()

  - by dmindreader

  This: Console c = System.console(); String readline; String u = c.readLine("%s", "args"); Throws a NullPointerException. Yet the signature of the method is: public String readLine(String fmt, Object... args) Why's this exception being thrown?

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• Understanding this prolog implementation of head

  - by dmindreader

  head([Y],Y):-!. head([X|XS],X). I understand that the head of the list is stored on the variable X. What does the first clause mean? Is it a cut? Why?

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