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• I need some help creating a non-binary tree (or some other data structure that will better solve my problem)

  - by EDO

  I have about ten lists of numbers and some strings. Each list has about <= 30K lines. Each line on a list has a distinct number. I need to build an efficient way of finding all the lines in each list that has the same 'control' number (or key for dB guys) and comparing what is in their string parts. I am writing this in Java. I have thought about using trees but my brain cells are about burnt now. I need some help.

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• Using T[1] instead of T for functions overloaded for T(&)[N]

  - by Abyx

  The asio::buffer function has (void*, size_t) and (PodType(&)[N]) overloads. I didn't want to write ugly C-style (&x, sizeof(x)) code, so I wrote this: SomePacket packet[1]; // SomePacket is POD read(socket, asio::buffer(packet)); foo = packet->foo; But that packet-> looks kinda weird - the packet is an array after all. (And packet[0]. doesn't look better.) Now, I think if it was a good idea to write such code. Maybe I should stick to unsafe C-style code with void* and sizeof? Upd: here is another example, for writing a packet: SomePacket packet[1]; // SomePacket is POD packet->id = SomePacket::ID; packet->foo = foo; write(socket, asio::buffer(packet));

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• Fast language for problem solving? [closed]

  - by Friend of Kim

  I learned PHP to make websites. After some years I've started using programming for solving what is difficult tasks for my level. Now I want to make a program that solves equations. (I want to write it myself, not use an API. Because I'm doing this for the sake of the challenge, not for the result..) Because of this, I'm going to learn a new and faster/better language. It's going to be C++, Java, Python or C#. What are the benefits of each language, and which language is best for speed compared to speed of writing and readability? Using C would be lightning fast, but the lack of OO is making for more complex code and reduces the readability, for example..

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• Getting collision detection in Pygames

  - by user36010

  I am writing a game in Pygame, I want to get collision detection. The aim is when a object hits another, the target object disappears. I want to avoid having classes and just have my code class less for now, in one script. This makes it difficult to get collision detection because the Rect method in Pygame is called on by an object(class). The logic I want to achieve is: object hits a target object target object disappears. is there an easy way to achieve this?(with minimal code possible)

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• Emacs-like keybindings system-wide?

  - by kermit666

  Is there a way to set Emacs-like keyboard shortcuts (at least the subset mentioned below) for the whole OS? This is possible in some apps such as the terminal, Emacs (go figure :) and additionally through special plugins in some other apps (Eclipse), but I got so used to C-f-ing through text and never having to jump to arrows that I'd like to be able to do this system-wide so that I can do it whenever I'm typing - e.g. searching for songs in Rhythmbox, typing stuff into the dash or the HUD, writing mails in Thunderbird or Gmail... The combos I'm most interested in are: C-f - forward C-b - backwards C-a - home C-e - end C-d - delete C-k - delete line (note for non-emacs users - C means Ctrl)

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• Help me to find a good name for my website

  - by framomo86

  Hi guys, I have a web marketing question for you. I'm looking for a good domain name for my web app. This site is about writing. Any kind of user generated writings including poetry, aphorisms, short stories, song lyrics etc. I have some candidates, but I think it can be better. . I want the name to promote very good quality words, not just random facebook-like status updates. This is my list, but I think you can do better, any help would be very very appreciated. I promise to add your name in my credit if i pick your answer. Thanks Yourwritings Youwrite Beautifulwords thewriter writingshare

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• I finished "Beginning Android Games", should I use its framework?

  - by orod

  I've worked through Mario Zechner's "Beginning Android Games" and have made my own pong and asteroids game using the framework used in the book. I have also downloaded the source code for Replica Island and am able to run that. I like Replica Island's framework over the one I made from reading the book. Some differences are that Replica Island uses different activities for each screen instead of Zechner's Screen class and that Replica Island can use a lot of textures and isn't limited to textures with dimensions of powers of 2. If I'm serious about writing games and apps for Android should I learn Replica Island's framework and use that instead of the one I made while reading Zechner's book?

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• When do I bite the bullet and hire a developer? [closed]

  - by Paul Seattle

  I have an awesome URL, I've had it since the mid 90's, and up until around 2002 I was having an awesome time writing music reviews and features into static pages and adding their URL to static index pages and everything was just great. Then things got complicated really fast, and for one reason or another I handed the site over to a very talented friend who turned it into a db based site run by cf. Now, here I am around twelve years later putting it all back together using mysql, php and css on a need-to-learn basis and even though I'm sooo close to where I want it to be I realize, erm, it should have been written using mysqli etc etc ad infinitum. So I'm wondering at what point do I just give in and hire a developer to take over, how much does it even cost, and how do I know I'm working with someone who is better than I am?

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• Model Based Apps and Frameworks

  Having been involved (mostly as a user or observer) with several recent applications and frameworks, Ive come to the conclusion that building your app/framework on an internal model is generally the best way to go.  In this post Ill explain what I mean by on an internal model and later describe the benefits I have seen, realized, been told about by others and still others that Ive only imagined (but are still possible).  I plan on writing a few blog posts along these lines to explore what...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How to make a jar file run on startup & and when you log out?

  - by RanZilber

  I have no idea where to start looking. I've been reading about daemons and didn't understand the concept. More details : I've been writing a crawler which never stops and crawlers over RSS in the internet. The crawler has been written in java - therefore its a jar right now. I'm an administrator on a machine that has Ubuntu 11.04 . There is some chances for the machine to crash , so I'd like the crawler to run every time you startup the machine. Furthermore, I'd like it to keep running even when i logged out. I'm not sure this is possible, but most of the time I'm logged out, and I still want to it crawl. Any ideas? Can someone point me in the right direction? Just looking for the simplest solution.

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• Should I fork for a major re-write that uses a small amount of the original code?

  - by It'sNotALie.

  I'm writing a library. It's a completely rewritten version of another one, to suit my needs (PCL compatibility, mainly). However, the API will be completely rewritten, as I'll need to change a lot of stuff around for PCL compliance. Also, as it is a rewrite, I won't be able to just start from the library and just change it bit by bit, as I typically see with forks. I tried that, but it just didn't work. So what should I do? Should I fork here or should I make a new library?

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• Legality of modifying and distributing the JRE

  - by herpylderp

  I see that Google App Engine apps run on a so-called secured sandbox JRE; that is, a JRE that Google modified and that makes changes to certain JRE types. This is how GAE prevents developers from writing apps that can do things like: Access the local file system via File Make remote JDBC calls Use JNDI Lots of other restrictions We have a similar need where we have an app that developers will be able to write plugins for. These plugins will need to utilize an API (a JAR) that we distribute with our app. We cannot afford for plugins to do certain things, particularly on the end user's file system, and need to modify the File class in a similar manner that GAE does. Long back-story short, this means we'll need to ship our app with a custom, modified JRE. My question: is this legal to do, or did Google likely pay Oracle some fee to modify/distribute their own JRE for app engine?

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• juju: How do I list all the relation variables and debug them interactively?

  - by mfisch

  I'm writing a charm that requires a mysql database, I found from looking at other charms that this (below) is how I get the info about the database: user=`relation-get user` password=`relation-get password` mysqlhost=`relation-get private-address` But I just found that from reading the wordpress charm example, is there a way to show all the relation variables that I can use? Also, while debugging my db-relation-changed script, I wanted to ssh into my host and interactively run those commands, for example relation-get user, but it didn't work. I resorted to having to restart everything and use juju log to print them out. This wasted a lot of time. Is there a way to print out these relations, either from my dev box or from the instance running my charm? (Below is what happens when I tried to interactively run relation-get): ubuntu@mfisch-local-tracks-0:~$ relation-get user usage: relation-get [-h] [-o OUTPUT] [-s SOCKET] [--client-id CLIENT_ID] [--format FORMAT] [--log-file FILE] [--log-level CRITICAL|DEBUG|INFO|ERROR|WARNING] [-r RELATION ID] [settings_name] [unit_name] No JUJU_AGENT_SOCKET/-s option found

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• Is it a bad practice to have an interface to define constants?

  - by FabianB

  I am writing a set of junit test classes in java. There are several constants, for example strings that I will need in different test classes. I am thinking about an interface that defines them and every test class would implement it. The benefits I see there are: easy access to constants: "MY_CONSTANT" instead of "ThatClass.MY_CONSTANT" each constant defined only once Is this approach rather a good or bad practice? I feel like abusing the concept of interfaces a little bit. You can answer generally about interfaces/constants, but also about unit tests if there is something special about it.

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• Nexus S 4g not detected by computer

  - by Newbie in over his head

  A little bit of a disclaimer, I have very little knowledge of the correct terminology for some of the things I'm going to ask about, and I apologize in advance I have a Nexus S 4g phone that is, at the moment of writing, connected to my 11.10 computer through its USB charger cable. In the past, connecting the phone like this has allowed me to transfer files between my computer and my phone; I'm able to get my music onto my phone, and my photos onto my computer, for example. For some reason, this has stopped working. My phone still charges its battery when connected to the computer, but neither the computer nor the phone recognized that they are connected. Is there something I can do to get the phone and the computer to detect each other? I don't know how to fix this, and it's more than a little frustrating. Any help would be greatly appreciated.

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• Resolving equivalence relations

  - by Luca Cerone

  I am writing a function to label the connected component in an image (I know there are several libraries outside, I just wanted to play with the algorithm). To do this I label the connected regions with different labels and create an equivalence table that contain information on the labels belonging to the same connected component. As an example if my equivalence table (vector of vector) looks something like: 1: 1,3 2: 2,3 3: 1,2,3 4: 4 It means that in the image there are 2 different regions, one made of elements that are labelled 1,2,3 and an other made of elements labelled 4. What is an easy and efficient way to resolve the equivalences and end up with something that looks like: 1: 1,2,3 2: 4 that I can use to "merge" the different connected regions belonging to the same connected component? Thanks a lot for the help!

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• When to Use workflow engines?

  - by A01_

  I'm totally new to this concept from design perspective. I've worked in past on some of the workflow engines as programmer but never had a clarity on why we chose the work-flow engines in first place. And as programmer I know that there are at least 100 ways to do anything when you are writing code but only few of the ways are the best! I still don't understand which use cases are best solved by workflow engines (or rather their concept) than designing a good DI enabled application. I'm looking for any general characteristics of domain-neutral use cases, where work-flow engines are one of the the best options. So my question is: What are general characteristics of a requirement which can be taken as a signal for opting for a good workflow engine and coding around it? Cheers!

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• SQL SERVER Precision of SMALLDATETIME A 1 MinutePrecision

  I am myself surprised that I am writing this post today. I am going to present one of the very known facts of SQL Server SMALLDATETIME datatype. Even though this is a very well-known datatype, many a time, I have seen developers getting confused with precision of the SMALLDATETIME datatype. The precision of the datatype [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• background animation algorithm for single screen

  - by becool_max

  I’m writing simple strategy game (in xna), and would like to have an animated background. In my game all the actions happens inside one screen and thus standard parallax effect does not look appropriate. However, I found a video of a game with suitable background animation for my game http://www.youtube.com/watch?v=Vcxdbjulf90&feature=share&list=PLEEF9ABAB913946E6 (from 3 to 6s, while main character stays at the same place). What is the algorithm to do this stuff? It would be nice if someone can provide a reference for a similar example (language is not important).

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• What is the current state of apple device (iPhone, iPod, etc.) support?

  - by BullfrogBlues

  What ubuntu applications provide support? (guides, how to's, status) Also, specifically, details on support for syncing music to iPhone's and iPod's with the latest OS version, as of writing iOS 5: Can you sync music to apple devices using iOS5? (iPhone & iPod) What applications allow you to do this and how? (guides, how to's, status) What has already been established is: Apple does not support Linux and has no plans to. libimobiledevice seems to provide some support but does not support syncing music with devices using iOS5. (I can't test libmobiledevice with anything other iOS5, so I can't provide details on how that works)

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• Accidentally deleted my windows 7 while installing ubuntu, trying to reinstall it

  - by user286874

  I had Windows 7 Ultimate on my desktop and I believe have downloaded the correct ISO file. I've been trying to use GParted and UNetbootin to create a bootable usb by formatting to FAT32, flagging the boot box, and writing to the flash drive with UNetbootin, but there have been problems. When I select my flash drive in the BIOS, it just reflashes the BIOS stock MSI picture 4 times then boots to Ubuntu anyway. Details: it's a new computer, self-built, hasn't shown any problems in the past, got Windows 7 through r/softwareswap so it's a MSDN file, the flash drive is a Sandisk U3 Cruzer, I uninstalled the bloatware when Iwas using Windows 7, but in the BIOS it still comes up as "Sandisk U3 Cruzer" I don't have a cCD/DVD drive. I dont care if I have to completely delete ubuntu in the process, I just need Windows 7 back by monday. I think the problem is because of the cruzer and am going to pick up a different flash drive today.

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• Yet another Java EE 6 book

  - by alexismp

  We have a new Java EE 6 book in store! This one from Packt Publishing is called "Java EE 6 Development with NetBeans 7" by David Heffelfinger who is also author of Java EE 5 and GlassFish books. This book holds a step-by-step book documention all of the Java EE 6 features and APIs (including CDI) using the IDE with the best Java EE out-of-the-box experience : NetBeans 7. It uses GlassFish as the default container and PrimeFaces as a JSF component suite. We've covered several Java EE and GlassFish books before and I can't help but think that given writing books never helped authors retire early, having so many good books on Java EE 6 says something about its success among developers.

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• Documentation vs tutorials vs video tutorials - which one's better?

  - by Cat

  As a developer/software engineer, what would you say are the most helpful resources when attempting to learn and use a new system? If you had to integrate a new SDK into your codebase/application, which one of the following options would you much rather go with? documentation tutorials video tutorials Same question for learning a new framework (e.g. writing an iOS app, learning Python, integrating the Android SDK, etc.). I'm not referring to becoming an expert, just get to know enough to use a system/language/framework properly. This is a pretty general question, but I think it's very relevant to anyone who's doing engineering work, since learning how to use new systems quickly is a very important skill to have. Thank you!

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• How do you balance between "do it right" and "do it ASAP" in your daily work?

  - by Flot2011

  I find myself pondering this question times and times again. I want to do things the right way, to write a clean, understandable, correct code that is easy to maintain, but what I really do pretty often is writing a patch upon patch just because there is no time, clients are waiting, a bug should be fixed overnight, the company is losing money on this problem, a manager is pressing hard etc. etc. I know perfectly well that in a long shot I am wasting much more time on these patches, but as this time is spread over months of work, nobody cares. Also, as one of my managers used to say, we don't know if there will be this long shot if we will not fix it now. I am sure I am not the only one entrapped in this endless real/ideal choices. So how you, fellow programmers, are coping with this?

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• Attaching Events to Document Better Than Attaching Them to Elements?

  - by Todd

  While bouncing around StackOverflow, I've noticed a number of people attaching events (notably click events) to the document as opposed to the elements themselves. Example: Given this: <button id="myButton">CLICK ME</button> Instead of writing this (using jQuery just for brevity): $('#myButton').on('click', function() { ... }); They do this: $(document).on('click', function() { ... }); And then presumably use event.target to drill down to the element that was actually clicked. Are there any gains/advantages in capturing events at the document level instead of at the element level?

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