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  • Why don't computers store decimal numbers as a second whole number?

    - by SomeKittens
    Computers have trouble storing fractional numbers where the denominator is something other than a solution to 2^x. This is because the first digit after the decimal is worth 1/2, the second 1/4 (or 1/(2^1) and 1/(2^2)) etc. Why deal with all sorts of rounding errors when the computer could have just stored the decimal part of the number as another whole number (which is therefore accurate?) The only thing I can think of is dealing with repeating decimals (in base 10), but there could have been an edge solution to that (like we currently have with infinity).

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  • How should calculations be handled in a document database

    - by Morten
    Ok, so I have a program that basically logs errors into a nosql database. Right now there is just a single model for an error and its stored as a document in the nosql database. Basically I want to summarize across different errors and produce a summary of the "types" of errors that occured. Traditionally in a SQL database the this normalization would work with groupings, sums and averages but in a NoSQL database I assume I need to use mapreduce. My current model seems unfit for the task, how should I change the way I store "models" in order to make statistical analysis easy? Would a NoSQL database even be the right tool for this type of problem? I'm storing things in Google AppEngine's BigTable, so there are some limitations to think of as well.

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  • Any valid reason to Nest Master Pages in ASP.Net rather than Inherit?

    - by James P. Wright
    Currently in a debate at work and I cannot fathom why someone would intentionally avoid Inheritance with Master Pages. For reference here is the project setup: BaseProject MainMasterPage SomeEvent SiteProject SiteMasterPage nested MainMasterPage OtherSiteProject MainMasterPage (from BaseProject) The debate came up because some code in BaseProject needs to know about "SomeEvent". With the setup above, the code in BaseProject needs to call this.Master.Master. That same code in BaseProject also applies to OtherSiteProject which is just accessed as this.Master. SiteMasterPage has no code differences, only HTML differences. If SiteMasterPage Inherits MainMasterPage rather than Nests it, then all code is valid as this.Master. Can anyone think of a reason why to use a Nested Master Page here instead of an Inherited one?

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  • Collision filtering techniques

    - by Griffin
    I was wondering what efficient techniques are out there for mapping collision filtering between various bodies, sub-bodies, and so forth. I'm familiar with the simple idea of having different layers of 2D bodies, but this is not sufficient for more complex mapping: (Think of having sub-bodies of a body, such as limbs, collide with each other by placing them on the same layer, and then wanting to only have the legs collide with the ground while the arms would not) This can be solved with a multidimensional layer setup, but I would probably end up just creating more and more layers to the point where the simplicity and efficiency of layer filtering would be gone. Are there any more complex ways to solve even more complex situations than this?

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  • Dealing with a developer continuously ignoring edge cases in his work

    - by Alex N.
    I have an interesting, fairly common I guess, issue with one of the developers in my team. The guy is a great developer, work fast and productive, produces fairly good quality code and all. Good engineer. But there is a problem with him - very often he fails to address edge cases in his code. We spoke with him about it many times and he is trying but I guess he just doesn't think this way. So what ends up happening is that QA would find plenty issues with his code and return it back for development again and again, ultimately resulting in missed deadlines and everyone in the team unhappy. I don't know what to do with him and how to help him overcome this problem. Perhaps someone with more experience could advise? Thank you!

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  • After re-installing ubuntu 13.10, stuck at GRUB Rescue, Boot-Repair didn't work!

    - by user205691
    Because i could not get the WiFi login work, i thought i will reinstall ubuntu, with internet connection to have updated drivers for wireless & graphics etc. I have deleted earlier linux partitions usings gparted and re-installed ubuntu 13.10, exactly following the same steps as i did earlier, making a 100GB /home on dev/sda and pointing root to /dev/sdb (SSD) and swap on dev/sda/ . Installing boot on /dev/sdb. But, somehow i think the grub is either corrupted or removed because i am unable to boot the laptop to any OS now. I get the following message: "no such device" xxxxx followed by huge HEX number GRUB rescue when i type ls on Grub rescue prompt, i can see hd0 & hd1, but thats about it. i tried Boot-repair but it is unable to fix the problem. The following log is generated via boot-repair create log: Boot-repair log I am unable to boot into windows or linux at the moment and need help to fix the grub so i can boot !!

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  • "44 Tips" in PHP Magazin and Other NetBeans IDE Screencasts

    - by Geertjan
    My recent YouTube series "44 Tips for Front End Web Devs" (part 1, part 2) has been picked up by PHP Magazin: http://phpmagazin.de/news/Frontend-Entwicklung-mit-NetBeans-IDE-168339 Great. I'm working on more screencasts like that, from different angles. For example, one will methodically explain each and every window in NetBeans IDE; another will step through the creation of an application from conception to deployment; while another will focus on the NetBeans IDE extension points and how easily they can be used to add new features to NetBeans IDE. The screencast approach has, I think, a lot of advantages. They take less time to make and they seem to be more effective, in several ways, than tutorials. Hearing someone talk through a scenario seems to also put things in a clearer perspective than when you have everything written out in a document, where small details get lost and diversions are more difficult to make. Anyway, onwards to more screencasts. Any special requests?

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  • Storing lots of large strings with frequent "appends" and few reads

    - by Thiago Moraes
    In my current project, I need to store a very long ASCII string to each instance of a given object. This string will receive an 2 appends per minute and will not be retrieved so frequently. The worst case scenario is a 5-10MB string. I'll have thousands of instances of my object and I'm worried that storing all those strings in the filesystem would not be optimal, but I can't think of a better solution. Can anyone suggest an alternative? Maybe a key-value store? In this case, which one? Any other thoughts?

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  • links for 2010-06-14

    - by Bob Rhubart
    White Paper: Application Portfolio Rationalization: How IT Standardization Fuels Growth Co-authors Hamidou Dia and Roy Hunter describe an Enterprise Architecture approach to application portfolio rationalization. (tags: oracle otn entarch) @soatoday: Cloud & Compliance: Write a Solid Prenup "Think of your cloud contract as a prenuptial agreement," says Oracle ACE Director Jordan Braunstein. "There must be clear recourse and commitments." (tags: soa cloud oracleace entarch) @fteter: Resilience and Relationships "Take a look at your own enterprise architecture with these ideas in mind," suggests Oracle ACE Director Floyd Teter, "and see if your outlook doesn't change." (tags: entarch complexity oracleace) @lucasjellema: Calling an EJB from a SOA Composite Application using the EJB Binding based on Java Interface Oracle ACE Director Lucas Jellema illustrates the use of one of several new capabilities in Oracle SOA Suite 11g R1 Patch Set 2 (11.1.1.3.0). (tags: soa oracleace middleware soasuite oracle)

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  • Removal of libsound2 file causes graphics loss

    - by Sajid Ahmad
    I was trying to install skype on ubuntu 12.10 desktop. but it was giving some error related to libsound2:i386 file. to overcome this problem i removed file libsound2 thinking that will install it later. but it removes all the graphics from my system. after removal of the file system started to give error that system is running in low graphics mode. I tried to install libsound2 file again but couldn't. After it i have upgraded the release of my ubuntu version using command do-release-upgrade think that it will install the missing file. But still there are no graphics on the system. I am using Dell Inspiron 15 . Please help me to tell that how can i get the graphics of system back.

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  • Is there an alternative Skype client?

    - by Joseph
    I love Ubuntu, but one thing I think is a pain is skype for it. It's outdated, buggy and generally just not as smooth as a lot of the other Ubuntu software. Is there an alternative for it? I'm not speaking about another IM like AIM or Live Messenger. Put another piece of software like the native app that comes with Ubuntu, that allows me to sign into Skype as well? Or is there perhaps a plugin for the native Ubuntu chat app that allows Skype contacts, calling etc. etc.

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  • The Grand Unified Framework Theory

    Tom Janssens left a comment: What still bugs me is that we do not have a unified pattern for all .net dev (using modelbinders and icommand for example...) But, Tom we are pretty close. At least as close as we should be, I think. With .NET there are plenty of low level patterns we can reuse regardless of the application platform or architecture. Stuff like: Asynchronous programming with events or the TPL. Object queries with LINQ. Resource management with IDispose. At a higher...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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  • Why are 2 Adobe Flash Plugin on USC (Ubuntu Software Center)?

    - by LuC1F3R
    As you know in Ubuntu Software Center is 2 times Adobe Flash Plugin. One is called Adobe Flash Plugin and other Adobe Flash Plugin 10. Which of the two to install? Or rather it is the recommended installation methods? If we think well, we can install the Adobe Flash plugin for Firefox from the notification date (Install missing plugin) or walking on the Adobe website and downloading the package .deb. After all, how to properly install Flash Player on Linux Ubuntu? (But my biggg question is why are 2 Adobe Flash Plugin on USC? ...for what? If you click on "More Info", the description are the same for both)

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  • Should a senior developer refuse to take paper exams during an interview?

    - by ??? Shengyuan Lu
    I found that many senior developers refuse to do paper exams in interviews. They regard the exam as a kind of humiliation, because they think that "They don't trust my programming ability even if I have five years working experience... only junior staff need take a paper exam...". However, Joel insists: 11. Do new candidates write code during their interview? Would you hire a magician without asking them to show you some magic tricks? Of course not. Is it justifiable if a senior developer refuses to take a paper exam in an interview?

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  • Why aren't tangent space normal maps completely blue?

    - by seahorse
    Why aren't normal maps just blue? I would think that normal maps should be predominantly blue in color because the Z component of the normal is represented by blue. Normals point out of the surface in the Z direction so we should see blue as the predominant colour since the Z component is dominant. By definition tangent space is perpendicular to the surface. At any point we should have the normal always pointing in the Z (blue direction) with no X (red direction) or Y (green direction). Thus the normal map (since it is a "normal map") should have the colour of the normals which is just blue (R = x = 0, G = y = 0, B = z = 1) with no shades in between. But normal maps are not so, and they have gradients of shades in them. Why is this so?

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  • Convert filenames to their checksum before saving to prevent duplicates. Is is a smart thing to do?

    - by Xananax
    TL;DR:what the title says I am developing some sort of image board in PHP. I was thinking of changing each image's filename to it's checksum prior to saving it. This way, I might be able to prevent duplicates. I know this wouldn't work for two images that are the same but differ in size or level of compression or whatnot, but this method would allow for an early check. What bugs me is that I never saw this method implemented anywhere, so I was wondering if there is a catch to it. Maybe it is just more efficient to keep the original filename and store the hash in DB? Maybe the whole method is just not useful and my question is moot? What do you think? On a side note, I don't really get how hashes are calculated so I was wondering, if my first question checks out, if it would be possible to calculate the likeness that two images are similar by comparing hashes (levenshtein or something of the sort).

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  • Beyond Syntax Highlighting - What other code representations are possible today?

    - by Mathieu Hélie
    Despite GUI applications having been around for 30ish years, software is still written as lines of text instructions, for various valid reasons. But we've also found that manipulating these text instructions is mind-blowingly difficult unless we apply a layer of coloring on different words to represent their syntax, thus allowing us to quickly parse through these text files without having to read the whole words. But besides the Sublime Text minimap feature, I've yet to see any innovation in visual representation of code since colors came around on CRT monitors. I can think of one obviously essential representation that modern graphics technology allows: visual hierarchies for nested structures. If we make nested text slightly smaller than its outer context, and zoom on it when the cursor is focused on the line, then we will be able to browse huge files of nested statements very quickly. This becomes even more essential as languages based on closures and anonymous functions become filled with deep statements. Has anyone attempted to implement this in a text editor? Do you know of any otherwise useful improvements in representing code text graphically?

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  • What is a non commital approach to software analysis

    - by dsjbirch
    When I think about software analysis the first thing which comes to mind is SSADM and the UML. But, what I want is a high level view of the system before I commit to a programming paradigm. Where am I going wrong? How do I approach a problem in a high level and generic way before I commit to a paradigm? What are the diagrams/tools available to support me? Edit: Some examples of tools that appear to be what I'm after are... A block diagram - http://en.wikipedia.org/wiki/Block_diagram A data flow diagram - http://en.wikipedia.org/wiki/Data_flow_diagram

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  • How to set default hreflangs for some languages?

    - by user1721135
    I want to make a site with different versions for 2 countries, which have the same language. Then I need to do the same for another language. Basically I want to have 6 versions of the site: UK English US English Default English ?? Austrian German Germany German Default German The question is, how do I define the "default" language versions, for any country with this language which isnt defined already? I know there is x-default, but I think you can only use that once and it is for all languages and all countries.

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  • How to get paid and figure out if I want to keep this client [migrated]

    - by Heiner Fawkes
    I have a client who is not paying on time, but it looks like the specifics don't match similar questions on this SE site. I got a call from a client I did website work for years ago. I had not done this kind of work for many years and frankly I'm not sure I want to now, but nevertheless about a month ago I agreed to bring his website, SEO, social media, and overall marketing for his small business up to speed. Why? He has told me many times how I'm the most honest, most well-informed contractor he's had experience with. And I personally kind of like him too. So I started working on an hourly basis. I sent one very small invoice and got paid. Then we talked a whole lot about all sorts of feature he would like me to implement. I started that work, and sent a second invoice on the first of the month (one of my two stated billing days). I didn't get paid. On every invoice it states that I charge a whopping ten percent per week late. I sent many voicemails and emails asking to please let me know what's going on with payment, and didn't get replies. Then the 15th of the month rolled around (which I stated initially as one of my invoicing dates). Since I hadn't been paid for the last invoice, I simply didn't send him an invoice at that time but emailed him and said that I will combine it with the next scheduled invoice for this reason (probably a bad idea I realize). Eventually he sent a portion of the invoice payment. I emailed back to let him know that he's three weeks late and what the remaining balance is. Finally we got in touch via phone. He basically told me that he thought I hadn't done all of the work I said I did. He looked at the page source code and it didn't look complete to him. I explained why his perception would be different and what work I had done as specified. He accepted this and said that part of the reason he didn't pay in full is that he's been swamped with personal family stuff, and part of the reason is that he didn't think I did all the work. That struck me as pretty weird. He also expressed concern that he has no idea now how much all the changes he has asked for are going to cost. And once again, he told me how honest and high-quality my services are compared to others he has dealt with. He also said he would pay me more (but not all) of the now three weeks overdue invoice that day. I didn't receive any payment. Basically this is how the client relationship strikes me: He's not good at communication. He's very busy and English isn't his first language. He almost never replies to emails but phone calls are fine. He's asked me to avoid emails for communication and I've asked him to please use email. He might not have enough money to afford all the things he has asked for. But so far I have been working for an hourly fee (which is quite high). He also has started paying monthly for hosting and social media services from me. What seems very abnormal is for a client to be so overdue on payments and to actually withhold payment of an invoice without any communication because he didn't think the work was done. I told him that I will send dollar estimates of each module of remaining work so that we can decide which ones are the highest priority if he cannot afford them all. I also reiterated that in the future if he has doubts about the work or an inability to pay, he must contact me immediately to say so. I basically plan to state the following to him: I would like to work for him and help his business. I also have sympathy for his recent family difficulties. I am happy to figure out payment plans that would work better for him, but first I need to be paid in full for all outstanding invoices, especially given that I skipped one of them just to be nice. The most crucial thing I need is communication about any problems with my work or his ability to pay. Once again, he heeds to pay in full immediately before we negotiate anything else. Does the above seem like an appropriate communication? Is anything missing from it? Is anything I'm doing here really abnormal?

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  • BTrFS subvolume / snapshot question

    - by bumbling fool
    I think I'm having difficulty fully understanding subvolumes and snapshots. The /home partition is btrfs. I want to create a "backup" snapshot of /home/user (for example) but user has existed for years (previously ext4 btrfs-convert). I believe you can only make a snapshot of a subvolume. I checked and there are no "default" subvolumes already present. 1) Is there another way for me to backup /home/user other than creating a subvolume /home/user2 and copying everything from user to user2 in order to snapshot it?

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  • Correct definition of the term "Yak Shaving"

    - by StevenWilkins
    The wiktionary has two different definitions: Any apparently useless activity which, by allowing you to overcome intermediate difficulties, allows you to solve a larger problem. The actually useless activity you do that appears important when you are consciously or unconsciously procrastinating about a larger problem. This post defines it as: yak shaving is what you are doing when you're doing some stupid, fiddly little task that bears no obvious relationship to what you're supposed to be working on, but yet a chain of twelve causal relations links what you're doing to the original meta-task. I personally prefer the final definition because it contains the word "fiddly" which I think perfectly describes a typical yak shaving task. What is the best definition you've come across or can provide?

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  • Problems with brother printer drivers on 64bit 12.04

    - by Jeff Klein
    I'm running 12.04 64bit on a toshiba satellite laptop. I have a Brotrher MFC-J825dw printer. I've installed brothers driver for it and the cupswrapper but it won't print. I says it is receiving data but it never shows up in the queue. I've also tried the text only generic driver and the same thing happens. I think some dependencies are missing for the cups wrapper and when I try to find it it says it can't be installed. Nopt sure if that's the problem because it doesn't explain the generic driver failure. In any case, any ideas?

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  • Are outdated comments an urban myth?

    - by Karl Bielefeldt
    I constantly see people making the claim that "comments tend to become outdated." The thing is, I think I have seen maybe two or three outdated comments my entire career. Outdated information in separate documents happens all the time, but in my experience outdated comments in the code itself are exceedingly rare. Have I just been lucky in who I work with? Are certain industries more prone to this problem than others? Do you have specific examples of recent outdated comments you've seen? Or are outdated comments more of a theoretical problem than an actual one?

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  • Gnome, Desktop, Gui, Menu Panel : Upgrading from 10.04 to 11.04

    - by Avukonke Peter
    After upgrading from ubuntu 10.04 to ubuntu 11.04, my gnome (Desktop) is completely messed up. Because I was hesitant to remove all the packages that were on y desktop. I chose to keep all the dependent files during my upgrade to Ubuntu 11.04. After the upgrade my GUI is simply not working. I think it's because of the conflicting files that I choose to keep while upgrading. I can launch nautilus manually,but still I don't have access to any of the menus available in ubuntu. Is there a way I can upgrade from 11.04 to 11.10 and restore my GUI. I tried to upgrade using aptitude, but it doesn't detect the latest ubuntu release, is there a way I can specify where to find the latest release as well get my GUI back ?

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