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• Keep user and user profile in different tables?

  - by Andrey

  I have seen in a couple of projects that developers prefer to keep essential user info in one table (email/login, password hash, screen name) and rest of the non essential user profile in another (creation date, country, etc). By non-essential I mean that this data is needed only occasionally. Obvious benefit is that if you are using ORM querying less fields is obviously good. But then you can have two entities mapped to same table and this will save you from querying stuff you don't need (while being more convenient). Does anybody know any other advantage of keeping these things in two tables?

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• GTK applications do not start

  - by Greg

  Hello, I have a fresh install of Ubuntu 10.04 Server on nodes of a computational cluster, and I access the nodes via ssh. I configured a X server, which I start with the command startx -- -ac. The server is running fine on port :0. Then, I set the environment variable DISPLAY to :0. Now, when I run a GTK application on the node, it fails with the following error: Error: Unable to initialize gtk, is DISPLAY set properly? Now, my question is, is there any runtime library that I need for running GTK applications on top of a X server? I'm probably missing something obvious here, but I can't tell what :P

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• Common mistakes made by new programmers without CS backgrounds [on hold]

  - by mblinn

  I've noticed that there seems to be a class of mistakes that new programmers without CS backgrounds tend to make, that programmers with CS backgrounds tend not to. I'm not talking about not understanding source control, or how to design large programs, or a whole host of other things that both freshly minted CS graduates and non-CS graduates tend to not understand, I'm talking about basic mistakes that having a CS background will prevent a programmer from making. One obvious and well trod example is that folks who don't have a basic understanding of formal languages will often try to parse arbitrary HTML or XML using regular expressions, and possibly summon Cthulu in the process. Another fairly common one that I've seen is using common data structures in suboptimal ways like using a vector and a search function as if it were a hash map. What sorts of other things along these lines would you look out for when on-boarding a batch of newly minted, non-CS programmers.

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• alt+shift can't be set to toggle language

  - by Ali

  I recently did a fresh installation of Ubuntu 13.10; but there is something bothering me, which I don't quite understand. When I first tried to toggle the keyboard language(I usually switch between Persian and English) using the good old "alt+shift" shortcut it didn't work. Then, I went and checked the Keyboard shortcut settings and found out that it had been set to "super+space"(which BTW didn't work either). So I tried to change it back to "alt+shift" but it just doesn't work; when I press "alt+shift" to set it up as the toggle-language shortcut, the box automatically resets itself to its previous value(without any errors whatsoever). As far as I've checked I couldn't find any thing obvious corresponding to the shortcut "alt+shift" either. I've currently set up the shortcut as "Ctrl+space"; so I can toggle the language. My question is why I cannot set it up to just "alt+shift"?

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• Alsa version numbers not consistent

  - by user69245

  I've recently moved from 10.04 to 12.04 and have problems with crackles on audio when the screen changes (especially obvious in a Skype conversation with video). !!Kernel Information !!------------------ Kernel release: 3.2.0-26-generic-pae Operating System: GNU/Linux Architecture: i686 Processor: i686 SMP Enabled: Yes !!ALSA Version !!------------ Driver version: 1.0.24 Library version: 1.0.25 Utilities version: 1.0.25 Running through the SoundTroubleShooting procedures I got the above details at Step 3. Is the mismatch between the Driver version (1.0.24) and the Library and Utilities versions (1.0.25) the cause of my problem, or should I be looking elsewhere? In answers to the question "Will ALSA 1.0.25 version have time to enter 12.04?" I read that 1.0.25 would be part of the new kernel, but my kernel version appears to be newer than the original release.

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• Should you document everything or just most?

  - by TheLQ

  It seems a bit of a controversial subject to document everything, including the "JavaBean" syntax of getters and setters for fields: People say its needlessly long and repetitive breaking DRY (don't repeat yourself), that the naming convention should explain everything, and it clutters code/documentation. Sometimes those arguments work. But other times, you end up with this: Above is common to open source projects that do boldly follow those principles. Your left with entirely useless documentation. That doesn't explain anything about whats going on underneath, the possible effects, or even what the expected value is (could it be null or never null? I don't know, the Javadoc doesn't tell me). So when should I document? Do I document everything even if it occasionally clutters code? Or do I document nothing since in my eyes its "obvious"?

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• Icon zoom on gnome panel with mouseover?

  - by brent.with.a.mustache

  I'm actually quite surprised that I couldn't find any information regarding this question through simple google-ing; I would think that it was something of a no-brainer kind of question. I'm basically trying to figure out if there's any way to have the icons in the side panel/favorites bar magnify as you mouseover them, much like you'd see in any the popular launcher programs (i.e. rocket dock or apple's launcher)? I'm on a netbook with a rather limited amount of screen real estate to work with, so the icons depicting my "favorite applications" have been reduced to a permanent, unsatisfying handful of pixels. Again, it seems to me that this should be a fairly obvious feature to include in the options for the panel, so I'm hoping that there's an easy solution. Unfortunately, I haven't found any way to make this happen, so any help would be appreciated. Here's a screenshot :squint: http://i.imgur.com/OpMIF.jpg -- ubuntu 11.10; gnome 3; hp mini 110

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• Hiding recent files in Unity dashboard

  - by Eric

  Ubuntu 13.04 (though had the same issue in both 12.04 LTS and 12.10). Unity desktop (yes I like it, shush). Anyways, when clicking on the dashboard there is a tab for 'Files and Folders'. I don't have any files on this computer that isn't porn. In other words, it displays the images there (as it's supposed to), but I can't have it displaying the porn for obvious reasons. I have disabled 'recent activity' and even added the folder it's all in to the 'do not record activity in the following folders'. I'm assuming that works but as I don't actually have any other files, it still displays them. I don't want to have to make it a hidden folder because it's on an external HDD and causes issues when moving from computer to computer (I have other movies on it as well). TL;DR: Get rid of the 'Files and Folders' tab in the dashboard. Is it possible?

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• Beginner Geek: Everything You Need To Know About Browser Extensions

  - by Chris Hoffman

  Browser extensions extend your web browser with additional features, modify web pages, and integrate your browser with the other services you use. This guide will introduce you to the world of browser extensions and help you get started. If you’re a geek, this stuff is obvious to you. We geeks take this for granted — we know exactly what browser extensions can do, when to use them, and what to avoid. But not everyone knows all this stuff.    

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• Google Analytics Export API - nextPagePath data

  - by Btibert3

  I am probably missing something obvious, but I do not understand when I query: start.date = DATE_START, end.date = DATE_END, dimensions = c("ga:pagePath","ga:previousPagePath"), metrics = c("ga:pageviews"), filters = mypageofinterest, table.id = "ga:mytable", max.results=RESULTS my data return as expected, all of the previous pages including (entrance). However, when I modify the code to be nextPagePath start.date = DATE_START, end.date = DATE_END, dimensions = c("ga:pagePath","ga:nextPagePath"), metrics = c("ga:pageviews"), filters = mypageofinterest, table.id = "ga:mytable", max.results=RESULTS only one line of data are returned; the pagepath and nextpagepath are identical with itself. I replicated this result using the Query Explorer. What am I missing or doing wrong? I was expecting to see a large number of "next" pages, including (exit). Thanks in advance.

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• Best free wireframe software for websites

  - by Fritz Meissner

  Working on a non-profit project and wondering if there's a standout wireframing tool for website design. I've taken photos of collaborative whiteboard drawings and now I want to put the results into something slightly more professional looking for review. For obvious reasons I'm not interested in anything that looks too much like the finished product or takes longer than it would for me to write the HTML. I checked out jumpchart, but that only seems to let you do content panes, not draw whole page layouts. Free or close to free is desirable - for instance jumpchart licensing seems very reasonable.

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• How do you measure the effectiveness of your hiring & interview process?

  - by Yevgeniy Brikman

  Although I've seen many discussions on how to do an interview and develop your brand, I haven't seen many discussions on how to determine if your hiring & interview process is actually working well. I think this question has two parts: How do you know your hiring process is getting the right candidates to apply and go through the interview process? Of the people that you end up interviewing, how can you tell that the ones you choose to hire are better (on average) than those that you rejected? I suppose the "extreme" cases - when you end up with a superstar or a total dud - are pretty obvious, but what about the rest?

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• How to create realistic 2d lighting using colour temperature

  - by Truncheon

  I'm looking for a lighting algorithm that produces realistic lights expressed in kelvins, from about 2500k to 6500k. What I'm confused about is how to make the lights properly interact with the colors of game objects. If a whole level is fully lit (overcast daylight) then it would seem that I should use just the color of the object. But what if I'm in a closed room with no windows, and there is an incandescent bulb shining light in the room? How would that light properly light up the objects in the room? There does not seem to be an obvious solution to the problem. And simply mixing the color of the light with the colors of the object, seems an inaccurate approach.

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• Isometric algorithm [fixed]

  - by David

  so i've been toying with isometric and i just cant get the tiles to be in the right order. im probably missing something obvious and i just cant see it... but even at the risk of looking stupid, heres my code. for (int i = 0; i < Tile.MapSize; i++) { for (int j = 0; j < Tile.MapSize; j++) { spriteBatch.Draw( Tile.TileSetTexture, new Rectangle( (-j * Tile.TileWidth / 2) + (i * Tile.TileWidth / 2), (i * (Tile.TileHeight - 9) / 2) - (-j * (Tile.TileHeight - 9) / 2), Tile.TileWidth, Tile.TileHeight), Tile.GetSourceRectangle(tileID), Color.White, 0.0f, new Vector2(-350, -60), SpriteEffects.None, 1.0f); } } and heres what i end up with delicious messed up map yep, bit of an issue. so if anyone could help, i'd appreciate it. edit* works now <_<

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• shutdown logging in ubuntu 10.04 & 11.10

  - by Joe

  When my system starts up it logs everything into syslog/dmesg. And I can review it for problems. When my system shuts down, where does that get logged? I didn't see anything obvious in /var/log in 10.04. (My 11.10 system is out of reach at the moment.) I looked at How do I turn on 'shutdown logging' or operating system tracing? but didn't see anything that helped. I use kubuntu, but all of the stuff at this level is probably the same.

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• How should I store a Game Database on Android?

  - by Liam

  I'm looking at creating a game for Android and while I have most of the ins and outs worked out, the one thing I'm struggling with is how to store data for the game. Ultimately, the game will be based off of a lot of pre-defined data and statistics so the obvious choice to me would be something like SQLite, but as I'm pretty new to the realm of Android and Game Development, I'm not 100% certain if this is the right route to follow. The data will be general pre-defined data as well as player data (along the lines of careers stats - what place finished, etc). I was wondering if there was a better/best practice solution that wasn't SQLite and that would provide said functionality and if so, could you point me in the right direction?

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• initial Class design: access modifiers and no-arg constructors

  - by yas

  Context: Student working through Class design in personal/side project for Summer. I've never written anything implemented by others or had to maintain code. Trying to maximize encapsulation and imagining what would make code easy to maintain. Concept: Tight/Loose Class design where Tight and Loose refer to access modifiers and constructors. Tight: initially, everything, including setters, is private and a no-arg constructor is not provided (only a full constructor). Loose: not Tight Exceptions: the obvious like toString Reasoning: If code, at the very beginning, is tight, then it should be guaranteed that changes, with respect to access/creation, should never damage existing implementations. The loosening of code happens incrementally and must be thought through, justified, and safe (validated). Benefit: Existing implementing code should not break if changes are made later. Cost: Takes more time to create. Since this is my own thinking, I hope to get feedback as to whether I should push to work this way. Good idea or bad idea?

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• Images from remote source - is it possible or is it bad practice?

  - by user1620696

  I'm building a management system for websites and I had an idea related to image galleries. I'm not sure it's a good approach. Since image space needed is related to how many images a user might upload, I thought about using cloud services like DropBox, Mega, and Google Drive to store images and load then when needed. The obvious problem with this approach is that downloading the images from the 3rd party service would hamper the user experience due to the increased download times. Is there any way to save images belonging in an image gallery on remote source without hampering the user experience because of speed? Or is this approach really not a good practice?

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• About floating point precision and why do we still use it

  - by system_is_b0rken

  Floating point has always been troublesome for precision on large worlds. This article explains behind-the-scenes and offers the obvious alternative - fixed point numbers. Some facts are really impressive, like: "Well 64 bits of precision gets you to the furthest distance of Pluto from the Sun (7.4 billion km) with sub-micrometer precision. " Well sub-micrometer precision is more than any fps needs (for positions and even velocities), and it would enable you to build really big worlds. My question is, why do we still use floating point if fixed point has such advantages? Most rendering APIs and physics libraries use floating point (and suffer it's disadvantages, so developers need to get around them). Are they so much slower? Additionally, how do you think scalable planetary engines like outerra or infinity handle the large scale? Do they use fixed point for positions or do they have some space dividing algorithm?

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• Great Java EE Concurrency Write-up!

  - by reza_rahman

  As you are aware JSR-236, Concurrency Utilities for the Java EE platform, is now a candidate for addition into Java EE 7. While it is a critical enabling API it is not necessarily obvious why it is so important. This is especially true with existing features like EJB 3 @Asynchronous, Servlet 3 async and JAX-RS 2 async. On his blog DZone MVB Sander Mak does an excellent job of explaining the motivation and importance of JSR-236. Perhaps even more importantly, he discusses potential issues with the API such alignment with CDI and Java SE Fork/Join. Read the excellent write-up here!

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• Should I forward the a call to .Equals onto .Equals<T>?

  - by Jaimal Chohan

  So, I've got you bog standard c# object, overriding Equalsand implementing IEquatable public override int GetHashCode() { return _name.GetHashCode(); } public override bool Equals(object obj) { return Equals(obj as Tag) } #region IEquatable<Tag> Members public bool Equals(Tag other) { if (other == null) return false; else return _name == other._name; } #endregion Now, for some reason, I used to think that forwarding the calls from Equals into Equals was bad, no idea why, perhaps I read it a long time ago, anyway I'd write separate (but logically same) code for each method. Now I think forwarding Equals to Equals is okay, for obvious reasons, but for the life me I can't remember why I thought it wasn't before. Any thoughts?

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• How to identify potential for becoming a programmer

  - by Jacob Spire

  There's heaps of information out there on hiring someone who's already a programmer. (Or claims to be one.) But what about identifying someone who has the potential to become a programmer, with little or no knowledge? Aside from the obvious things to look for (smart, gets things done), are there any interview questions and/or tests to determine whether one has the potential to become a programmer? Note: I'm not asking how to tell whether I can learn programming, but how to tell someone else is right for it.

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• HTG Explains: Learn How Websites Are Tracking You Online

  - by Chris Hoffman

  Some forms of tracking are obvious – for example, websites know who you are if you’re logged in. But how do tracking networks build up profiles of your browsing activity across multiple websites over time? Tracking is generally used by advertising networks to build up detailed profiles for pinpoint ad-targeting. If you’ve ever visited a business’ website and seen ads for that business on other websites later, you’ve seen it in action. Here’s How to Download Windows 8 Release Preview Right Now HTG Explains: Why Linux Doesn’t Need Defragmenting How to Convert News Feeds to Ebooks with Calibre

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• How to install Edubuntu on a system with low memory (256 Mb)?

  - by int_ua

  I'm preparing an old system with 256 Mb RAM to send it to some children. It doesn't have Ethernet controller and there are no Internet access at the destination. I've chosen Edubuntu for obvious reasons and modified it with UCK trying to minimize memory usage just to install, let alone using it yet. But Ubiquity won't start even in openbox (edited /etc/lightdm/lightdm.conf) because there are no space left on /cow right after booting. I've already deleted things like ibus, zeitgeist, update-manager (no network access after all), twisted-core, plymouth logos. I'm thinking about creating a swap partition on HDD, can it be later added to expand this /cow ? Is there a package for the text-mode installation which is used on Alternate CDs? I don't want to re-create Edubuntu from an Alternate CD. This behavior is reproducible in VM limited to 256Mb RAM.

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• NetBeans 7.2 RC1 is published

  - by Ondrej Brejla

  NetBeans 7.2 RC1 was today published. You can download it here. You could read about the PHP features added to the NetBeans 7.2 release here on the blog, but the main features added or improved are: Support for PHP 5.4 PHP editing: Fix Uses action, annotations support, editing of Neon and Apache Config files and more Support for Symfony2, Doctrine2 and ApiGen frameworks FTP remote synchronization Support for running PHP projects on Hudson For more information, just look at New and Noteworthy page for NetBeans 7.2. And as obvious you can help us to test the build. Just try it and if you find an issue / error, please report it. Thanks for your help.

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