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  • What's the purpose of the rotate instructions (ROL, RCL on x86) ?

    - by lgratian
    I always wondered what's the purpose of the rotate instructions some CPUs have (ROL, RCL on x86, for example). What kind of software makes use of these instructions? I first thought they may be used for encryption/computing hash codes, but these libraries are written usually in C, which doesn't have operators that map to these instructions. Has anybody found an use for them? Why where they added to the instructions set?

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  • How can I use computer vision to find a shape in an image?

    - by Ryan
    I have a simple photograph that may or may not include a logo image. I'm trying to identify whether a picture includes the logo shape or not. The logo (rectangular shape with a few extra features) could be of various sizes and could have multiple occurrences. I'd like to use Computer Vision techniques to identify the location of these logo occurrences. Can someone point me in the right direction (algorithm, technique?) that can be used to achieve this goal? I'm quite a novice to Computer Vision so any direction would be very appreciative. Thanks!

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  • Inter-rater agreement (Fleiss' Kappa, Krippendorff's Alpha etc) Java API?

    - by adam
    I am working on building a Question Classification/Answering corpus as a part of my masters thesis. I'm looking at evaluating my expected answer type taxonomy with respect to inter-rater agreement/reliability, and I was wondering: Does anybody know of any decent (preferably free) Java API(s) that can do this? I'm reasonably certain all I need is Fleiss' Kappa and Krippendorff's Alpha at this point. Weka provides a kappa statistic in it's evaluation package, but I think it can only evaluate a classifier and I'm not at that stage yet (because I'm still building the data set and classes). Thanks.

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  • SqlDataAdapter.Fill suddenly taking a long time

    - by WraithNath
    I have an application with a central DataTier that can execute a query to a data table using an SQLDataAdapter. None of this code has changed but now all queries are taking at least 10x as long to execute a query returning even one record. The only difference is that I have been using the app in a VM but the issue has started mid way through using the application. eg, the speed issue has not manifested itself from the start of using the VM, rather half way through. Has anyone else had an issue with the SQL Data Adapter taking a long time to fill for no reason? executing the query in Management studio it runs in less than a second. Firewalls are disabled

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  • Why is the Java VM so popular?

    - by sdudo
    There are more and more programming languages (Scala, Clojure,...) coming out that are made for the Java VM and are therefore compatible with the Java Byte-Code. I'm beginning to ask myself: Why the Java VM? What makes it so powerful or popular that there are new programming languages, which seem gaining popularity too, created for it? Why don't they write a new VM for a new language?

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  • Concurrent processes do not utilize all available CPU

    - by metdos
    I run some processes on an EC2 cc2.8xlarge instance which has 32 virtual processors. For some type of processes, when I run 16 processes on parallel, all of them use 100% of CPU cycles. But for other type of processes, they are not using 100% CPU and they finish considerably slower than a single thread. There is no time spend on IO and all data is served from memory. Do you have any idea about the reason of this problem?

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  • Gradient boosting predictions in low-latency production environments?

    - by lockedoff
    Can anyone recommend a strategy for making predictions using a gradient boosting model in the <10-15ms range (the faster the better)? I have been using R's gbm package, but the first prediction takes ~50ms (subsequent vectorized predictions average to 1ms, so there appears to be overhead, perhaps in the call to the C++ library). As a guideline, there will be ~10-50 inputs and ~50-500 trees. The task is classification and I need access to predicted probabilities. I know there are a lot of libraries out there, but I've had little luck finding information even on rough prediction times for them. The training will happen offline, so only predictions need to be fast -- also, predictions may come from a piece of code / library that is completely separate from whatever does the training (as long as there is a common format for representing the trees).

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  • What's the best way to share folder between guest and host machine in VMWARE over VPN?

    - by melaos
    i have a win 7 host machine and i'm running my vmware which is a win server machine. So i'm doing windows development work on my vmware. the source codes are in my win 7 machine which i access using a shared folder method. My only problem now is when my vmware connects to VPN to the deploy the codes, the folder gets disconnected. as i don't really understand the networking or the vmware architecture, what can i do so that i can share the folder from my win 7 host machine to my vmware without getting disconnected when i connect to VPN using my guest (win server) machine? please advise. stuck on vmware thanks

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  • How to setup a Linux machine to remotely use laptop screen as a second display?

    - by Ignas Limanauskas
    I am looking for a similar solution to MaxiVista, but for Linux (Ubuntu). I have an Ubuntu machine with just one display attached, but I also have a Windows laptop running a virtual machine with Ubuntu installed. I figured there must be a way to trick the main Ubuntu machine remotely use the virtual machine's display capabilities. After all, X11 does support forwarding and things like that. Any ideas how to do it using VNC? I saw some references to xdmx, but instructions so far are vague and do not seem to work on my machine(s).

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  • Do I need social networks to be an expert developer? [closed]

    - by Gerald Blizzy
    This question may sound odd, but do I need twitter, facebook and google+ if I am a web-developer? I see many expert developers nowadays using it in working order. It seems like it's harder to stay in touch with customers, co-workers and potential customers if you don' use social networks. Am I right? Reason why I ask is that I am totally not a facebook/twitter person, I find it boring and annoying. I understand that linkedin is usefull for career, but what about twitter and facebook? Are they needed for web-developer career? What I am trying to ask is if I only use linkedin, own portfolio website, google talks, gmail and something like github, would I actually miss anything professionally/job-wise? My thoughts are that I can just have my portfolio website where I list all my projects aswell as contacts page with my google talks/gmail account. It can suit both fulltime job, freelance and own projects. So this way email and google talks is just enough. Am I right or not? Thanks in advance!

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  • Liberate Your Laptops! The Return of Virtual Developer Day

    - by Justin Kestelyn
    Many enterprises are reducing travel, conference, and training budgets for their developers without any change in expectation for the results those developers must deliver. How can you keep up? Well, some months back we offered you a Virtual Developer Day on the subject of building Rich Enterprise Applications, the key piece of which was free access to a cloud development environment for hands-on. Now it's back, new and improved! Join us for a FREE, online, multi-language event series for developers (English version is on July 27) at Oracle Technology Network 's Virtual Developer Day. This unique one-day event provides you the opportunity to: 1. Get trained on Oracle Tuxedo from the comfort of your laptop 2. Get hands-on, locally with Oracle VM VirtualBox or via the Cloud 3. Learn what Python, Ruby, and PHP have to do with Oracle Tuxedo 4. Network online with peers, Oracle Tuxedo architects and developers worldwide 5. Sessions, Labs, and Live Help in LOCAL Languages! Review the agenda details, dates, and language support options. Space is limited, so register for this event now! For information and to register go to: www.oracle.com/goto/otnvdd

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  • Developer with 4 years experience with Java/C++. How to move into web programming? [closed]

    - by JerryC
    Possible Duplicate: Tips for switching jobs and moving into web based programming? I graduated in 2006 with a computer science degree and got solid grades (3.5 overall 3.8 in my major) For the past 4.5 years I've been working as a Software Engineer doing primarily rich client development. Most of my experience is with Java, Swing and C++. I've done a lot of network programming and I have acquired some skill working & debugging in distributed environments. I would like to switch jobs and move into a role where I can get exposure to some new technologies and frameworks. I would like to move into a more web development role but I find my lack of web development experience is hurting me. 90% of the jobs I see advertised are looking for one of two skill sets: 1) Stereotypical server side Java web developer. Experience with Spring, Hibernate, J2EE, etc. 2) Stereotypical front end web developer. Experience with Javascript, jQuery, HTML5, GWT, CSS, etc I find most of these companies are looking really specifically for this experience and they are not willing to take on good programmers/ CS fundamental guys who lack experience with this stuff. I would love to get a job doing stuff like this, but have my skills become out of date and unmarketable? Any opinions on ways to sell myself to help get a new position?

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  • What is the fastest way for me to become a full stack developer? [on hold]

    - by user136368
    I run a small webdesign firm. I have an overview of HTML, CSS, JS, PHP(laravel), MySQL. I did a few courses on code academy. I wanted to build a web app in the company. I find that I am severely crippled by the lack of programming expertise. I want to become a full stack developer who can build a prototype on his own. I cannot spend 5-10k USD on the boot camp courses. Can someone suggest structured courses which can help me become a full stack developers? I found the following websites but I donot know if they can help me become one. My goal: Be able to make a working prototype of the ideas I come up with.(This is my primary goal. I do not want to be the lead developer. I just want to be able to make a prototype.) Several questions I have in mind: Will it be fine if I stick to PHP(laravel)? Should I be using ROR? I have come across a few online resources: Codeacademy, codeschool,teamtreehouse,and theodinproject. These are within my affordability range. I can commit to a 2-3 months intensively to learn programming. What do you suggest I do?

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  • Cannot get net 4.5rc to work

    - by ThomasD
    I have installed .net 4.5rc from http://msdn.microsoft.com/en-us/netframework/hh854779.aspx because I would like to use the new spatial features when developing with visual visual web developer 2010 express. But when I want to change the target framework to .net 4.5 in the project properties it is not there. I have checked the directory in C:\Windows\Microsoft.NET\Framework64 and can see that there is no v4.5 folder but the v4.0 directory has been updated with a timestamp corresponding to when I installed v4.5. The version of the v4.0 directory is v4.0.30319. I am running windows 7 on my computer. Any ideas why I cannot find v4.5 ? thanks Thomas *UPDATE Based on the comment below I have found out that I am running 4.5. For others reading this post, .net 4.5 replaces the files in the .net 4.0 directory but without renaming the directory to .net 4.5 (a bit confusing). To check whether your assemblies have been updated check the product version of eg. system.dll (right click - details). According to this post http://www.west-wind.com/weblog/posts/2012/Mar/13/NET-45-is-an-inplace-replacement-for-NET-40 if the product version is above 17000 it is running 4.5.

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  • Publishing to live website

    - by Alienfluid
    Hey there, My friend and I are collaborating on a ASP.NET powered website. To develop it locally, we use Visual Web Developer Express (good enough for our needs). Subversion (using Tortoise SVN) is our source control of choice with the repository residing on Unfuddle.com. We run into problems when we need to update the live site - since there's no version control on it. Currently we use the "Copy to Website" feature in VWD which copies the files using FTP. Here are some problems: VWD only keeps track of files uploaded by one user, so if the other user uploads a newer version of a file to the live site, VWD on my side cannot tell whether the live version of the file is newer or mine is. There's no way to tell whether all the latest changes are available on the live site. We have to be careful not to party all over the shared web.config file since the other user's local DB settings are different from mine, and of course, the live DB settings are a whole other story! What do you guys use to publish to a live site? Does anything out there tie into Subversion so that we can automate the process and always guarantee that the live site is synced to a change list number? Also, how do you manage the different web.config file settings? Thanks!

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  • are projects with high developer turn over rate really a bad thing?

    - by John
    I've inherited a lot of web projects that experienced high developer turn over rates. Sometimes these web projects are a horrible patchwork of band aid solutions. Other times they can be somewhat maintainable mozaics of half-done features each built with a different architectural style. Everytime I inherit these projects, I wish the previous developers could explain to me why things got so bad. What puzzles me is the reaction of the owners (either a manager, a middle man company, or a client). They seem to think, "Well, if you leave, I'll just find another developer." Or they think, "Oh, it costs that much money to refactor the system? I know another developer who can do it at half the price. I'll hire him if I can't afford you." I'm guessing that the high developer turn over rate is related to the owner's mentality of "If you think it's a bad idea to build this, I'll just find another (possibly cheaper) developer to do what I want". For the owners, the approach seems to work because their business is thriving. Unfortunately, it's no fun for the developers that go AWOL 3-4 months after working with poor code, strict timelines, and little feedback. So my question is the following: Are the following symptoms of a project really such a bad thing for business? high developer turn over rate poorly built technology - often a patchwork of different and inappropriately used architectural styles owners without a clear roadmap for their web project, and they request features on a whim I've seen numerous businesses prosper while experiencing the symptoms above. So as a programmer, even though my instincts tell me the above points are terrible, I'm forced to take a step back and ask, "are things really that bad in the grand scheme of things?" If not, I will re-evaluate my approach to these projects.

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  • are mobile can be used as a devices to develop application

    - by Richa Media and services
    I say that we can work @ mobile using a technique and work with any IDE and use any OS without problem like work on visual studio and use Window 7 How it possible ? 1. We use Mobile like a CPU and Use a monitor to watch code. We use samsung's techniques to display on monitor. it's give signal to monitor wirelessly to display code on monitor 2 We use Wireless keyboard and Mouse (if user like USB then he also use USB keyboard and mouse) 3. We use a component inside of mobile to control all devices like internet , wi-fi bluethoth. by component user easily setup , control and use feature. 4 don't be confused. i am sure to say that we not use mobile to watch code on mobile screen and Mobile 's keyboard because it's too smaller to work so we use Monitor (LCD) to display code and a keyboard to work comfortably and freely. 5. what are you think if you see a developer who work using this way 6. it is not impossible. give me some feedback and suggestion about your thinking on this technologies.

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  • Anyone knows good references for Machine Learning Algorithms and Image Recognition?

    - by RaymondBelonia
    I need it for my thesis and for some reason I am having a hard time finding decent books or websites for it. My thesis topic is "Classification of Modern Art Paintings using Machine Learning Approach". My goal is to classify examples of modern art paintings to its respective modern art movement(expressionism, realism,etc..) using machine learning approach. Also, suggestions and comments about my thesis are greatly appreciated.

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  • Has any hobbyist attempted to make a simple VGA-graphics based operating system in machine code?

    - by Bigyellow Bastion
    I mean real bare bones, bare machine here(no Linux kernel, pre-existing kernel, or any bootloader). I mean honestly write the bootloading software in direct microarchitecture-specific machine opcode, host the operating system, interrupts, I/O, services, and graphical software and all hardware interaction, computation, and design entirely in binary. I know this is quite the leap here, but I was thinking to practice first in x86 assembly (not binary) 16-bit style. Any ideas?

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