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Search found 101 results on 5 pages for 'lukasz'.

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• Given two lines on a plane, how to find integer points closest to their intersection?

  - by Lukasz Lew

  I can't solve it: You are given 8 integers: A, B, C representing a line on a plane with equation A*x + B*y = C a, b, c representing another line x, y representing a point on a plane The two lines are not parallel therefore divide plane into 4 pieces. Point (x, y) lies inside of one these pieces. Problem: Write a fast algorithm that will…

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• Naming case classes in Scala.

  - by Lukasz Lew

  I tend to have this redundant naming in case classes: abstract class MyTree case class MyTreeNode (...) case class MyTreeLeaf (...) Isn't it possible to define Node and Leaf inside of MyTree? What are best practices here?

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• Extending existing data structure in Scala.

  - by Lukasz Lew

  I have a normal tree defined in Scala. sealed abstract class Tree case class Node (...) extends Tree case class Leaf (...) extends Tree Now I want to add a member variable to all nodes and leaves in the tree. Is it possible with extend keyword or do I have to modify the tree classes by adding [T]?

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• How can I extend Scala collections with an argmax method?

  - by Lukasz Lew

  I would like to add to all collections where it makes sense, an argMax method. How to do it? Use implicits?

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• How to minimize the amount of place used by GPL copyright notice?

  - by Lukasz Lew

  Gnu GPL page advocates a following header in each file of GPL project: This file is part of Foobar. Foobar is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any…

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• CoreData, transient atribute and EXC_BAD_ACCESS.

  - by Lukasz

  I'm trying to build simple file browser and i'm stuck. I defined classes, build window, add controllers, views.. Everything works but only ONE time. Selecting again Folder in NSTableView or trying to get data from Folder.files causing silent EXC_BAD_ACCESS (code=13, address0x0) from main. Info about files i keep outside of CoreData, in…

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• Making stand-alone jar with Simple Build Tool.

  - by Lukasz Lew

  Is there a way to tell sbt to package all needed libraries (scala-library.jar) into the main package, so it is stand-alone? (static?)

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• How to handle execvp(...) errors after fork()?

  - by Lukasz Lew

  I do the regular thing: fork() execvp(cmd, ) in child If execvp fails because no cmd is found, how can I notice this error in parent process?

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• Qt layout problem.

  - by Lukasz Lew

  I have a following Qt code: QVBoxLayout* box = new QVBoxLayout; label = new QLabel(); // will be set later dynamically box->addWidget (label); Text in label will be set later. The problem is that when label resizes, it resizes QVBoxLayout, and it resizes other neighboring widgets. I don't want to make a label or layout fixed…

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• Have you actually convinced anybody to Scala?

  - by Lukasz Lew

  I had limited success myself. I was able to hype a few persons about Scala. But in fact none of them made a meaningful effort to try to switch (usually from Java). I would like to read both success and failure stories here. Both long tries and short ones. My goal is to find ways of presenting Scala to another person, friend,…

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• Selective jar packaging.

  - by Lukasz Lew

  I have my small program.jar that uses a small part of huge library.jar. Is there a tool to repackage several jars into one so it can be run stand-alone and is as small as possible?

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• Iterators for mutable collections in Scala?

  - by Lukasz Lew

  Does Scala have iterators with 'set' and 'remove' methods for iterating (and modifying) mutable collections like array? If there is no such iterator then is there a good reason for that?

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• How to implement a master/watchdog script in python?

  - by Lukasz Lew

  I need it to open 10 processes, and each time one of them finishes I want to wait few seconds and start another one. It seems pretty simple, but somehow I can make it work.

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• Subsonic SELECT FROM msdb

  - by Lukasz Lysik

  Hi, I want to execute the following query using Subsonic: SELECT MAX([restore_date]) FROM [msdb].[dbo].[restorehistory] While the aggregate part is easy for me, the problem is with the name of the table. How should I force Subsonic to select from different database than default one.

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• Which index is used in select and why?

  - by Lukasz Lysik

  I have the table with zip codes with following columns: id - PRIMARY KEY code - NONCLUSTERED INDEX city When I execute query SELECT TOP 10 * FROM ZIPCodes I get the results sorted by id column. But when I change the query to: SELECT TOP 10 id FROM ZIPCodes I get the results sorted by code column. Again, when I change…

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• Double variable argument list.

  - by Lukasz Lew

  I need something like this: class Node (left : Node*, right : Node*) I understand the ambiguity of this signature. Is there a way around it better than the following? class Node (left : Array[Node, right : Array[Node]) val n = new Node (Array(n1, n2), Array(n3)) Maybe some kind of separator like this? val n = new Node…

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• How to read pair in freemarker

  - by Lukasz Rys

  Ok i'm having little trouble with reading pair. So I'm creating my pair private Pair<Integer, Integer> count(somethink) { int c1 = 2; int c2 = 4; return new Pair<Integer, Integer>(c1, c2); } And 'sending' it to ftl via java mv.addObject("counted", count(somethink)); I won't write everythink how…

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• Tutorial on swing in Scala?

  - by Lukasz Lew

  Is there a good tutorial showing how to use scala.swing._ ?

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• Qt: Is it possible to tell a widget to take all the place that it has in layout, but not more?

  - by Lukasz Lew

  I have a following Qt code: QVBoxLayout* box = new QVBoxLayout; label = new QLabel(); // will be set later dynamically box->addWidget (label); Text in label will be set later. The problem is that when label resizes, it resizes QVBoxLayout, and it resizes other neighboring widgets. I don't want to make a label or…

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• Simple Build Tool jar packaging.

  - by Lukasz Lew

  Is there a way to tell sbt to package all needed libraries (scala-library.jar) into the main package, so it is stand-alone? (static?)

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• How to get Ponter/Reference semantics in Scala.

  - by Lukasz Lew

  In C++ I would just take a pointer (or reference) to arr[idx]. In Scala I find myself creating this class to emulate a pointer semantic. class SetTo (val arr : Array[Double], val idx : Int) { def apply (d : Double) { arr(idx) = d } } Isn't there a simpler way? Doesn't Array class have a method to return some kind…

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• Java reflection field value in extends class

  - by Lukasz Wozniczka

  Hello i hava got problem with init value with java reflection. i have got simple class public class A extends B { private String name; } public class B { private String superName; } and also i have got simple function: public void createRandom(Class<T> clazz , List<String>…

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• Which IDE for Scala 2.8?

  - by Lukasz Lew

  This is the same question for older version, but they say that Eclipse plugin has been improved. But what about others?

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• Poll: What is stopping you from switching (from Java) to Scala ?

  - by Lukasz Lew

  What would make you to switch to Scala ? If you are negative on the switching to Scala, please state the reason as well (or upvote). As with all StackOverflow Poll type Q&As, please make certain your answer is NOT listed already before adding a new answer If it already exists, vote that one up so we see…

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• Store children in database preserving information about their order

  - by GUZ

  I am designing database tables for a master-detail scenario. The specific requirement is that it is necessary to store information about the order of children. I see some possible solutions (like adding a column representing a position in the sequence, or a column with foreign key to the previous child) but I…

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