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  • Is premature optimization really the root of all evil?

    - by Craig Day
    A colleague of mine today committed a class called ThreadLocalFormat, which basically moved instances of Java Format classes into a thread local, since they are not thread safe and "relatively expensive" to create. I wrote a quick test and calculated that I could create 200,000 instances a second, asked him was he creating that many, to which he answered "nowhere near that many". He's a great programmer and everyone on the team is highly skilled so we have no problem understanding the resulting code, but it was clearly a case of optimizing where there is no real need. He backed the code out at my request. What do you think? Is this a case of "premature optimization" and how bad is it really?

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  • Attaching two objects and changing their world matrices accordingly

    - by A-Type
    I'm having a hard time wrapping my head around the transformations required to bind two objects together in either a two-way or one-way relationship. I will need to implement both types. For the first case, I want to be able to 'couple' two ships together in space. The ships have different mass, of course. Forces applied to either ship will use combined mass and moment of inertia to calculate and move both ships. The trick is, being sure that the point at which they are coupled remains the same, and they don't move at all relative to each other. The second case is similar: I want a ship to be able to enter the atmosphere of a planet and move relative to the planet. The planet will be orbiting the sun, which is fixed at 0,0,0. Essentially, when the ship is sitting still outside of the atmosphere, the planet will move past it on its course-- but when the ship is sitting still inside the atmosphere, it moves and rotates with the planet, so that it is always relative to the horizon. Essentially, the vertices which make up the ship are now transformed just like the ones that make up the planet, except that the ship can move itself around relative to the planet. I get the feeling I can implement both of these with the same code. Essentially, I am thinking of giving each object (which I call Fixtures) a list of "slave" Fixtures onto which that Fixture's world matrix is imposed. So, this would be the planet imposing its world on any contained ships. In the case of coupling, I would simply make each ship a slave of the other, somehow. Obviously I can't just multiply the ship's world matrix by the planet's, or each ship by the others. What I'd like some help with is what calculations to make in order to get a nice, seamless relative world to the other object. I was thinking maybe I could just multiply the world of the slave by the inverse of the master, but then when you couple two ships you would lose all that world data. So, perhaps I need an intermediate "world" which is the absolute world, but use a secondary "final world" to actually transform the objects?

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  • Directing from a 1und1 hosting solution, with urls intact

    - by Jelmar
    I have done this before on GoDaddy without a hitch, but I cannot seem to figure out this particular case. I have a domain space with temporary url http://yogainun.mysubname.com/ and am hosting the domain name that is to be applied to it at 1und1.de. Right now I have set it up so that from the 1und1 domain name hosting the address http://www.yoga-in-unternehmen.de/ is frame redirected to the subdomain that I just referred to. But this is not what I want. http://www.yoga-in-unternehmen.de/ is to be the domain. With the frame redirect, url's like http://www.yoga-in-unternehmen.de/example-article do not show up. But this is what I want. With godaddy in a similar case, I just turned on DNS and changed the name servers. That worked without problem, but with 1und1 not. Is there something I am missing?

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  • Ubuntu Stuck at boot after update

    - by raphie
    I'm doing this question because I can't edit other questions and I'm trying to set up my computer with Ubuntu but I'm a total idiot about this. I want to give Ubuntu a try, I build up a system specially for Ubuntu but when everything seems to be OK I made a suggested update and now when I restart my computer Ubuntu is stuck in the purple screen. I read other questions about this but, as I said, I'm a total idiot with this and I don't understand a bit what you guys are talking about when saying reboot with Grub, press Ctrl-F4 or whatever. My keyboard shutdown when this happens and only accepts Alt-Ctrl-Del to reboot again. Ctrl-F4 is not working for me. Pleas Help Me, cure my MS insanity Pleaseee! :) Any help I will appreciate it!

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  • HTG Explains: How Antivirus Software Works

    - by Chris Hoffman
    Antivirus programs are powerful pieces of software that are essential on Windows computers. If you’ve ever wondered how antivirus programs detect viruses, what they’re doing on your computer, and whether you need to perform regular system scans yourself, read on. An antivirus program is an essential part of a multi-layered security strategy – even if you’re a smart computer user, the constant stream of vulnerabilities for browsers, plug-ins, and the Windows operating system itself make antivirus protection important. 8 Deadly Commands You Should Never Run on Linux 14 Special Google Searches That Show Instant Answers How To Create a Customized Windows 7 Installation Disc With Integrated Updates

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  • 8 New Features in Ubuntu 12.10, Quantal Quetzal

    - by Chris Hoffman
    Ubuntu 12.10 has been released and you can download it now. From better integration with web apps and online services to improvements in Unity, there are quite a few changes – although none of them are huge or groundbreaking. The list of new features may be more exciting next time around, with Mark Shuttleworth promising secret development of new “tada!” features that will be unveiled closer to Ubuntu 13.04’s release. Can Dust Actually Damage My Computer? What To Do If You Get a Virus on Your Computer Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked

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  • Windows 7: Search indexing is stuck

    - by Ricket
    When I open Indexing Options, it says: 4,317 items indexed Indexing in progress. Search results might not be complete during this time. It's stuck at 4,317 though; no more items have been indexed. Worst of all, SearchIndexer.exe is taking up 100% CPU (well, 50%, but I have a dual core CPU; it's taking up all processing power it can). It is not causing hard drive activity though. I tried clicking "Troubleshoot search and indexing" at the bottom of the Indexing Options window, but it couldn't find any problem. I've also tried the repair registry key that several websites suggest; I change HKLM\SOFTWARE\Microsoft\Windows Search SetupCompletedSuccessfully to 0 and restarted the computer, and it apparently repaired because it flipped back to 1, but the same problem continues to occur. It's reducing the battery life of my laptop and making it really hot so that my fans are running all the time. I've had to disable the Windows Search service. How can I fix this? Do I need to just flat-out reformat my computer? Update: I've tried rebuilding a couple times. There's nothing unusual about the locations I have to index, and I don't have any downloads in progress or anything like that. I don't see any reason why it stopped, and I noticed it much too late to do a system restore. At this point, I'm hoping someone will offer up some secret answer that will fix the problem, thus the bounty. Another update: I tried starting the service again, just to let it try yet again. It seemed okay at first (Indexing Options showed it operating at reduced speed due to user activity, and the number of files was going up). A while later I checked, and the service had stopped. Event viewer revealed some errors like this: Log Name: Application Source: Application Error Date: 2/1/2010 7:34:23 PM Event ID: 1000 Task Category: (100) Level: Error Keywords: Classic User: N/A Computer: ricky-win7 Description: Faulting application name: SearchIndexer.exe, version: 7.0.7600.16385, time stamp: 0x4a5bcdd0 Faulting module name: NLSData0007.dll, version: 6.1.7600.16385, time stamp: 0x4a5bda88 Exception code: 0xc0000005 Fault offset: 0x002141ba Faulting process id: 0x13a0 Faulting application start time: 0x01caa39f2a70ec02 Faulting application path: C:\Windows\system32\SearchIndexer.exe Faulting module path: C:\Windows\System32\NLSData0007.dll Report Id: b4f7a7ae-0f92-11df-87fc-e5d65d8794c2 Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="Application Error" /> <EventID Qualifiers="0">1000</EventID> <Level>2</Level> <Task>100</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2010-02-02T00:34:23.000000000Z" /> <EventRecordID>10689</EventRecordID> <Channel>Application</Channel> <Computer>ricky-win7</Computer> <Security /> </System> <EventData> <Data>SearchIndexer.exe</Data> <Data>7.0.7600.16385</Data> <Data>4a5bcdd0</Data> <Data>NLSData0007.dll</Data> <Data>6.1.7600.16385</Data> <Data>4a5bda88</Data> <Data>c0000005</Data> <Data>002141ba</Data> <Data>13a0</Data> <Data>01caa39f2a70ec02</Data> <Data>C:\Windows\system32\SearchIndexer.exe</Data> <Data>C:\Windows\System32\NLSData0007.dll</Data> <Data>b4f7a7ae-0f92-11df-87fc-e5d65d8794c2</Data> </EventData> </Event> If you are having the same error and arrived here from a Google search, please comment or add an answer detailing your progress on this, if any...

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  • How To Create Custom Keyboard Shortcuts For Browser Actions and Extensions in Google Chrome

    - by Chris Hoffman
    Geeks love keyboard shortcuts – they can make you faster and more productive than clicking everything with your mouse. We’ve previously covered keyboard shortcuts for Chrome and other browsers, but you can assign your own custom keyboard shortcuts, too. Google Chrome includes a built-in way to assign custom keyboard shortcuts to your browser extensions. You can also use an extension created by a Google employee to create custom keyboard shortcuts for common browser actions – and less common ones. Image Credit: mikeropology on Flickr (modified) Can Dust Actually Damage My Computer? What To Do If You Get a Virus on Your Computer Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked

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  • Anti aliasing problem

    - by byronyasgur
    I am auditioning fonts on google web fonts and one that I was discounting was Ubuntu because it looked a bit jagged ( screenshot below taken straight from google); however afterward I read an article where it was mentioned as a good choice, and there was a screenshot where it looked really good ( to me anyway ). I am using windows 7 and have tried looking at it in chrome and firefox. I notice the same thing with some other fonts but this one is a good example because it looks perfect in the screenshot but not so good when I look at it on their site. I know this essentially is a question about setting my computer, but I thought that this would be the best place to pose the question: Is there something wrong with the settings on my machine seeing as it's obviously not showing the font the same on my computer as it did when the article writer downloaded it and used it in an image. The screenshot from Google ... The screenshot from the article above ...

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  • How to Configure Windows Defender

    The existence of spyware and other unwanted irritations on the Web is so widespread that keeping your PC protected is an absolute must. Microsoft responded to this need with the inclusion of its Windows Defender program with Windows 7. Windows Defender does exactly what its name suggests, which is to defend your PC from spyware and other malicious programs. It does this first with real-time protection that notifies you if any spyware tries to run on your computer or if a program tries to change any vital settings in Windows. Windows Defender also helps to keep your computer protected thro...

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  • What is your preferred font for working with code and data?

    - by Gary
    The features I would look for in a 'programmers' font are Monospaced (maybe less important for code, but more important for data) Distinguishable characters. Often I (uppercase i), 1 (one) and l (lower-case L) can be confusing, as can O (upper-case o) and 0 (zero). I'd be interested other character issues, especially in accented or extended character sets. Free Windows / Linux / OSX Legible on screen and printouts at smaller sizes I've community wiki'd this. I'm really looking for a list of fonts that qualify. From that list, people can pick what looks good to them.

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  • ethernet doesn't work

    - by Grig Tanasescu
    I know that it may look pretty stupid, but that's it. I have a ethernet connection with my mom's computer, and is her's who's the source or anyway it is called. I'm new at linux, but i had before linux mint 13 and the ethernet didn't work 'till a friend went to network settings-options he clicked "add" somewhere and and introduced some numbers, after he looked somewhere in my mom's computer. I've tried neither linux nor ethernet until now. Please help and sorry for my english. P.S. I'm just 13 and I don't know much about computers so, please, talk to me as you would with a completely idiot. Thanks

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  • Ubuntu 12.04 not Locking Encrypted Hard Drive on Log Out

    - by J.L.
    I'm running Ubuntu 12.04 with Gnome 3.4. I have two external hard drives. I encrypted both using Ubuntu's Disk Utility. When I use Nautilus to mount them, I'm asked for my decryption password. Regardless of whether I then click "Forget password immediately" or "Remember password until you logout", though, I find that Ubuntu does not lock the drives when I log out. Rather, when I log back in, they're still mounted. (To be clear, restarting the computer does unmount them so that they require the password on the next log in.) I'm concerned that these drives are remaining unprotected when I log out without restarting my computer. I would be grateful for help understanding whether this is a bug. Thank you!

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  • Is it possible to create a virtual drive and share via USB?

    - by Matthew
    My question is kind of hard to follow, but I'm asking if it's possible to make a virtual flash drive and sync it to another device with a USB to USB cable? To make things more clear, think of a typical flash drive. You connect it to a laptop and it shows up as a removable disk. Is it possible to make a computer a host of a "Virtual Drive" that would be connected to a USB cord on one end, and the other end connecting to another device such as a Xbox 360, or another computer.

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  • Ubuntu 13.10 not playing DVD videos

    - by John Hill
    I installed Ubuntu Gnome 13.10 on my computer yesterday, and everything seems to be working fine so far, except that it isn't reading video or audio CD's and DVD's. At first, I inserted a DVD video, and it played normally for maybe 30-45 seconds before coming up with a "internal read error" or something like that. I was using the Totem player when the problem occurred, so I tried installing the VLC media player. It wouldn't read the disc at all, so I uninstalled the player. Now, the Totem player won't even begin playing the DVD. The player sometimes doesn't even open up when I insert the DVD, and other times it will but says it can't read it. I've tried several different DVD's and CD's with similar results. The computer is recognizing the optical drive, because when I open "Files", it shows the drive and the disc, but can't play it. Previously, I ran Ubuntu 13.04 with the Gnome desktop installed from the software center, and I had no issues. Any help is appreciated!

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  • Naming your unit tests

    - by kerry
    When you create a test for your class, what kind of naming convention do you use for the tests? How thorough are your tests? I have lately switched from the conventional camel case test names to lower case letters with underscores. I have found this increases the readability and causes me to write better tests. A simple utility class: public class ArrayUtils { public static T[] gimmeASlice(T[] anArray, Integer start, Integer end) { // implementation (feeling lazy today) } } I have seen some people who would write a test like this: public class ArrayUtilsTest { @Test public void testGimmeASliceMethod() { // do some tests } } A more thorough and readable test would be: public class ArrayUtilsTest { @Test public void gimmeASlice_returns_appropriate_slice() { // ... } @Test public void gimmeASlice_throws_NullPointerException_when_passed_null() { // ... } @Test public void gimmeASlice_returns_end_of_array_when_slice_is_partly_out_of_bounds() { // ... } @Test public void gimmeASlice_returns_empty_array_when_slice_is_completely_out_of_bounds() { // ... } } Looking at this test, you have no doubt what the method is supposed to do. And, when one fails, you will know exactly what the issue is.

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  • brother MFC-J435W wireless scanning issue

    - by ogreen32
    Thanks for taking the time to read this. I have a brother MFC-J435W and I was able to get the printer set up for wireless printing, but it is not allowing me to scan wirelessly. It gives me the message to "check connection". I'll tell you what I've done so far and maybe someone can help me out. I've installed the scanner driver and scan tool I installed Xsane (to see if it would allow the scanner to communicate with the computer and that didn't help). I've tried restarting the computer. After those things I am now at a loss as to where to go from here. Any help would be great. Thanks. I've also searched for this question in the Brother FAQ as well as on here and I haven't found an answer. Thanks again.

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  • Using versioning for settings in home?

    - by maaartinus
    I planned to use git for the important files in my home directory, so I can revert bad settings or transfer them to another computer as needed. But there's too much chaos there, with each program mixing wildly temporary files, caches, logs, backups, and everything. Finding anything worth saving is hard, and when I've found any settings done by myself, there were mixed with informations specific to the computer (so I could hardly take them to another one) and timestamps (so tracking useful changes is hard). Is anybody doing it or is it just hopeless? How to filter out the garbage?

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  • Creating an install drive - can not open output file autorun.inf

    - by user226881
    I am trying to make an install/boot drive for a computer that has no operating system and no optical drive. I used the ISO from Ubuntu.com and the burner from pendrivelinux.com. When the program starts writing to the flash drive, there is an error displayed that says : "0 can not open output file E:\autorun.inf" But continues to write data. After it has finished, I remove the drive and insert to the other computer and turn it on, but it never finds a drive to boot from. What is causing this problem and how can I fix it ?

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  • Add in the header of the license type is enough to say: "my code is licensed"? (Open-source)

    - by silverfox
    I do not know if this is the correct place to ask this stackexchange. Note: If a moderator can move to the correct place (if I am in the inappropriate site SE) I read on various sites about licenses. I did just put the license type in the header file (in my case the javascript file - open-source). /* * "codeName" "version" * http://officialsite.com/ * * Copyright 2012 "codeName" * Released under the "LICENSE NAME" license * http://officialsite.com/LICENSE NAME */ javascript code ... In the same folder I leave a copy of the license. The listing of the folder looks like this: * codeName.js * LICENSE In the file LICENSE would leave my code uses. What nobody says is if it is enough to say my code is licensed (the case of an open-source). Or is something more required? Sorry for the bad English. Thanks.

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  • Colour scheme for editor - guidelines or medical reccomendations

    - by Kevin D
    Is anyone aware of any studies on what colour scheme is best for use in multi-coloured text based computer work? Specifically in terms of reducing eye strain. For instance is a black back ground and light text best? Should it be a dark colour rather than going all the way to black? I've seen the questions on this site about "which is your favourite" that is not what I am after. I also aware that my question may be to specific asking for a colour scheme, if anyone could link me to some guidelines instead that would be appreciated as well. I'm concious of the fact that anyone using a computer is really using it for text based work but with the multitude of colours used to convey information within our modern IDEs I feel this is a good StackExchange site for this question.

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  • How much time it needs google webmaster yo generate content keyword if url masking is enabled? [closed]

    - by user1439968
    Possible Duplicate: What is domain “masking” or “cloaking”? Why should it be avoided for a new web site? my real domain is domain.in. But url masking has been enabled and the masked url is domain2.in .. In that case i have added d url bputdoubts.21backlogs.in to google webmaster a week ago but content keyword hasn't been generated. In this case when can I expect to get the content keywords generated ?? And is there a problem for getting visitors from google search if url masking is enabled ?

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  • Menu bars are a basic light gray after installing graphics card driver. [closed]

    - by Jonathan
    Possible Duplicate: Desktop forgets theme? Hi, I've just installed Ubuntu 10.10 64-bit. It came up saying I could install 2 proprietary drivers, one for my WiFi adapter (which works perfectly) and one for my graphics card - a Sapphire AIT Radeon HD 5770 1024MB GDDR5 PCI-Express Graphics Card. The driver is called ATI/AMD proprietary FGLRX graphics driver. Before installing this driver I was unable to have Extra Visual Effects in Appearances. However after installing (and restarting) the menu bars are now in a basic light gray mode, rather than the sleek Ubuntu black. - Although Extra Visual Effects does now work. I've tried rebooting, and I've had a look around in ATI "Catalyst Control Center" but nothing has worked so far. Does anybody know what this windows mode is, how to change it back to normal and why it's doing it in the first place? Below is a screenshot of my computer: (This is also the first time I've installed Ubuntu on my computer, and am keen for it to work.)

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  • Applying for MS CS with an un-related Bachelor's Degree [closed]

    - by yeenow123
    I received a BA in Economics and went to work and started developing a passion for programming while on the job. This lead to learning more and more about computer science in general. I want to go for a Masters in Computer Science. I'm taking courses at the local college to get some of the undergrad CS courses out of the way (Data Structures etc.). However I'm not sure what to focus on for my application. Should I take the GRE for CS? A lot of college application procedures recommend it if you didn't go to undergrad for CS. Should I try to improve my GRE general test? I took it a month after college ended and got mediocre scores, so I could definitely study a bit harder and improve my scores. Anything else that's necessary? My current job is not exactly in a related field, but I do get to do some programming/coding.

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