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• Backtrack My "Education"

  - by perl.j

  About a year or so ago, I decided to start programming. I really, just jumped into a language (Perl) and went from there. What I regret is that I just jumped in: I didn't learn the basics (if you would call them basics). I didn't learn about Computer Science. This issue, I believe, is holding me back. Where should I "restart"? Are there any books, articles, etc. that I should read? Are there any topics an experienced programmer should know? What's your advice? Thanks! Please don't advise me to take a college/high-school class.

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• "Malformed line 6" error in my /etc/apt/sources.list

  - by Odi1215

  I'm new to Ubuntu so I don't really know much yet. I encountered this problem while on the terminal: E: Malformed line 6 in source list /etc/apt/sources.list (dist parse) E: The list of sources could not be read. What should I do? Help would be much appreciated. Here's my source.list: # /etc/apt/sources.list deb http://archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse deb http://security.ubuntu.com/ubuntu/ precise-security main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ precise-updates main restricted universe multiverse deb http://archive.canonical.com/ partner deb-src http://archive.canonical.com/ partner /etc/apt/sources.list

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• My Feelings About Microsoft Surface

  - by Valter Minute

  Advice: read the title carefully, I’m talking about “feelings” and not about advanced technical points proved in a scientific and objective way I still haven’t had a chance to play with a MS Surface tablet (I would love to, of course) and so my ideas just came from reading different articles on the net and MS official statements. Remember also that the MVP motto begins with “Independent” (“Independent Experts. Real World Answers.”) and this is just my humble opinion about a product and a technology. I know that, being an MS MVP you can be called an “MS-fanboy”, I don’t care, I hope that people can appreciate my opinion, even if it doesn’t match theirs. The “Surface” brand can be confusing for techies that knew the “original” surface concept but I think that will be a fresh new brand name for most of the people out there. But marketing department are here to confuse people… so I can understand this “recycle” of an existing name. So Microsoft is entering the hardware arena… for me this is good news. Microsoft developed some nice hardware in the past: the xbox, zune (even if the commercial success was quite limited) and, last but not least, the two arc mices (old and new model) that I use and appreciate. In the past Microsoft worked with OEMs and that model lead to good and bad things. Good thing (for microsoft, at least) is market domination by windows-based PCs that only in the last years has been reduced by the return of the Mac and tablets. Google is also moving in the hardware business with its acquisition of Motorola, and Apple leveraged his control of both the hardware and software sides to develop innovative products. Microsoft can scare OEMs and make them fly away from windows (but where?) or just lead the pack, showing how devices should be designed to compete in the market and bring back some of the innovation that disappeared from recent PC products (look at the shelves of your favorite electronics store and try to distinguish a laptop between the huge mass of anonymous PCs on displays… only Macs shine out there…). Having to compete with MS “official” hardware will force OEMs to develop better product and bring back some real competition in a market that was ruled only by prices (the lower the better even when that means low quality) and no innovative features at all (when it was the last time that a new PC surprised you?). Moving into a new market is a big and risky move, but with Windows 8 Microsoft is playing a crucial move for its future, trying to be back in the innovation run against apple and google. MS can’t afford to fail this time. I saw the new devices (the WinRT and Pro) and the specifications are scarce, misleading and confusing. The first impression is that the device looks like an iPad with a nice keyboard cover… Using “HD” and “full HD” to define display resolution instead of using the real figures and reviving the “ClearType” brand (now dead on Win8 as reported here and missed by people who hate to read text on displays, like myself) without providing clear figures (couldn’t you count those damned pixels?) seems to imply that MS was caught by surprise by apple recent “retina” displays that brought very high definition screens on tablets.Also there are no specifications about the processors used (even if some sources report NVidia Tegra for the ARM tablet and i5 for the x86 one) and expected battery life (a critical point for tablets and the point that killed Windows7 x86 based tablets). Also nothing about the price, and this will be another critical point because other platform out there already provide lots of applications and have a good user base, if MS want to enter this market tablets pricing must be competitive. There are some expansion ports (SD and USB), so no fixed storage model (even if the specs talks about 32-64GB for RT and 128-256GB for pro). I like this and don’t like the apple model where flash memory (that it’s dirt cheap used in thumdrives or SD cards) is as expensive as gold (or cocaine to have a more accurate per gram measurement) when mounted inside a tablet/phone. For big files you’ll be able to use external media and an SD card could be used to store files that don’t require super-fast SSD-like access times, I hope. To be honest I really don’t like the marketplace model and the limitation of Windows RT APIs (no local database? from a company that based a good share of its success on VB6+Access!) and lack of desktop support on the ARM (even if the support is here and has been used to port office). It’s a step toward the consumer market (where competitors are making big money), but may impact enterprise (and embedded) users that may not appreciate Windows 8 new UI or the limitations of the new app model (if you aren’t connected you are dead ). Not having compatibility with the desktop will require brand new applications and honestly made all the CPU cycles spent to convert .NET IL into real machine code in the past like a huge waste of time… as soon as a new processor architecture is supported by Windows you still have to rewrite part of your application (and MS is pushing HTML5+JS and native code more than .NET in my perception). On the other side I believe that the development experience provided by Visual Studio is still miles (or kilometres) ahead of the competition and even the all-uppercase menu of VS2012 hasn’t changed this situation. The new metro UI got mixed reviews. On my side I should say that is very pleasant to use on a touch screen, I like the minimalist design (even if sometimes is too minimal and hides stuff that, in my opinion, should be visible) but I should also say that using it with mouse and keyboard is like trying to pick your nose with boxing gloves… Metro is also very interesting for embedded devices where touch screen usage is quite common and where having an application taking all the screen is the norm. For devices like kiosks, vending machines etc. this kind of UI can be a great selling point. I don’t need a new tablet (to be honest I’m pretty happy with my wife’s iPad and with my PC), but I may change my opinion after having a chance to play a little bit with those new devices and understand what’s hidden under all this mysterious and generic announcements and specifications!

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• Ubuntu will not start due to full partitions

  - by mike

  I left my computer downloading all the night and I did download 35 GB of movies (legal ...). I restarted the computed in the morning then I booted in my encrypted Windows partition for my work. I have left my computer downloading 35GB of files and when I restarted in the morning, I booted Windows. When I tried to access Ubuntu, it failed to boot and in low-graphic mode told me that it won't boot because the partition is full. I tried rescue and it reported 0 MB free. I also cannot delete files with sudo rm as all are impossible due to a read-only file system. I can mount it in Windows but there is a "write protection" there, also. Should I try a live USB?

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• SSD-HDD price parity

  - by jchang

  It is hard to believe that we are essentially at SSD-HDD price parity? Of course I am comparing enterprise class 10K/15K HDDs to consumer grade SSDs. Below are prices I am seeing 300GB 15K HDD $370 900GB 10K HDD $600 1TB 7200 HDD $230 (less for consumer HDDs) 512GB SATA SSD $400-600 Intel SSD DC S3700 400GB $940 The 512GB SATA SSDs are consumer grade, MLC NAND, with only 7% over provisioning. That is 512GB (1GB = 2^30) of NAND, with 512GB (1GB =10^9) of user capacity. Intel just announced the SSD...(read more)

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• At what size of data does it become beneficial to move from SQL to NoSQL?

  - by wobbily_col

  As a relational database programmer (most of the time), I read articles about how relational databases don't scale, and NoSQL solutions such as MongoDB do. As most of the databases I have developed so far have been small to mid scale, I have never had a problem that hasn't been solved by some indexing, query optimization or schema redesign. What sort of size would I expect to see MySQL struggling with. How many rows? (I know this is going to depend on the application, and type of data stored. the one that got me thing was basically a genetics database, so would have one main table, with 3 or 4 lookup tables. The main table will contain amongst other things, a chromosome reference, and a position coordinate. It will likely get queried for a number of entries between two potions on a chromosome, to see what is stored there).

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• Book (or resource) on Java bytecode

  - by Andrea

  I am looking for some resources on the JVM bytecode. Ideally I would for a short book; something more than a blog post but not a 800 pages tome. If it is relevant, I am a Scala developer, not a Java one, although I know Java just fine. I would like something that allowed me to read JVM bytecode and answer questions such as: Why does the bytecode has to know about high level construct such as classes? Are subtyping relations still visible in bytecode? How does type erasure work exactly? How do Oracle and Dalvik bytecode differ, and what consequences does this have for, say, developing Android apps with Scala? How does the JVM manage the stack, and why exactly this creates issues with tail call elimination? and so on.

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• Big Data Learning Resources

  - by Lara Rubbelke

  I have recently had several requests from people asking for resources to learn about Big Data and Hadoop. Below is a list of resources that I typically recommend. I'll update this list as I find more resources. Let's crowdsource this... Tell me your favorite resources and I'll get them on the list! Books and Whitepapers Planning for Big Data Free e-book Great primer on the general Big Data space. This is always my recommendation for people who are new to Big Data and are trying to understand it....(read more)

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• SharePoint and Visual Studio - Replaceable parameters

  - by Sahil Malik

  SharePoint 2010 Training: more information What is a replaceable parameter? Sometimes you may see something like $SharePoint.Project.AssemblyFullName$ in your code. Visual studio is doing some magic to replace it during compile/build time with the full assembly signature. The following apply to these tokens or replaceable parameters - Tokens can be specified anywhere in a line. Tokens cannot span multiple lines. The same token may be specified multiple times on the same line and in the same file. Different tokens may be specified on the same line. Tokens that do not follow these rules are ignored without providing a warning or error. The replacement of tokens by string values is done immediately after manifest transformation, thus allowing manifest templates edited by a user to use tokens. Visual studio supports the following replaceable parameters -   Name Read full article ....

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• Time To Consider Getting Your Oracle Certification?

  - by Paul Sorensen

  Hi Everyone,I recently read an interesting study from Global Knowledge titled: 2010 IT Skills and Salary Report which contains a lot of great information related to IT worker trends including roles, required skills, demographics, salaries and more. I had to dig a little bit, but the report indicates that certification is valued by the majority of managers and those become certified, which underscores the results of our own surveys that show how certification is valued by IT workers, their employers and their customers.Additionally, if you look a little closer you will also find average salaries for those who are Oracle certified. Their salary figures are impressive and are among the top salaries of the certifications listed.If you have ever considered becoming certified or are in the process of becoming certified, I encourage you to look at the Global Knowledge study. With an ever-increasing suite of Oracle certifications available to you, there may be something within our certification offerings that will help you increase your skills, build your career, and gain additional credibility.Thank you,QUICK LINKSGlobal Knowledge 2010 IT Skills and Salary ReportOracle Certification 2009 Salary SurveyOracle Certification web site

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• php change uploaded file owner

  - by shantanu

  I installed php5 , mysql and apache2 without any error. Everything is working fine. apache2's Root directory is /var/www (permission is 775). Problem is when i upload a file using php code it change the owner of uploaded file (as root). So i can not read this file from another code without changing owner of file manually. Is there is anyway to solve this problem? Should i add user to php group (how)? Thanks in advance.

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• How to ramp up my data structures skills after a long hibernation

  - by Anon

  I was pretty good with algorithms and data structures once, a long long time ago. Since then, I programmed professionally, and then went to manage a small team, which totally shot my tech skills in this field back. I've decided I want to be a developer again, and work for Google. The thing is, I'm so out of practice, that if I were to be interviewed right now I would surely flunk out in 10 minutes. What training program would you recommend for me to get back into shape? I already started this weekend by going back to the absolute basics and implementing a few sort algorithms, linked list, and hash table. Next, I think I'll read through the entire course material on the other basic data structures and graph algorithms. I want to find a focused set of practical exercises I can do in a relatively short amount of time, to juggle the old brain cells. I know this stuff - I just need to remind myself that I know it.

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• SmartXLS for .Net v2.1.4 released

  SmartXLS is a high performance .NET Excel component which can write, read, calculate Excel compatible files without the need for Microsoft Excel on either the developer or client machines. It was entirely written in 100% managed C# code.Features list:Cell formattingformula calculationread/write Encrypted Excel files(xls and xlsx files).create Chart,pivot table from scratchexport/import data to/from datatableNew release features:Excel2007 tables support.Excel2007 ConditionFormat support.http://ww...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 does a proportional controller have a steady state error?

  - by Qantas 94 Heavy

  I've read about feedback loops, how much this steady state error is for a given gain and what to do to remove this steady state error (add integral and/or derivative gains to the controller), but I don't understand at all why this steady state error occurs in the first place. If I understand how a proportional control works correctly, the output is equal to the current output plus the error, multiplied by the proportional gain (Kp). However, wouldn't the error slowly diminish over time as it is added (reaching 0 at infinite time), not have a steady state error? From my confusion, it seems I'm completely misunderstanding how it works - a proper explanation of how this steady state error eventuates would be fantastic.

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• Alkan Improves Aeronautical-Equipment Product Collaboration, Design Processes, and Government Compliance

  - by Gerald Fauteux

  Alkan S.A. a leading aeronautical equipment manufacturer in France, specializing in carriage-release and ejection systems for various types of military aircraft utilize Oracle’s AutoVue Electro-Mechanical Professional for Agile as part of its Agile Product Lifecycle Management solution. AutoVue Electro-Mechanical Professional for Agile enables multiformat 3-D viewing of engineering designs, leading to deeper analysis of component and product functionality and allows all teams to easily participate and contribute to product data early in the development cycle. Alkan S.A.’s equipment is used in more than 65 countries and is certified for more than 60 types of aircraft, worldwide. Click here to read the complete story. French version.

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• How much time takes to a new language like D to become popular? [closed]

  - by Adrián Pérez

  I was reading about new languages for me to learn and I find very good comments about D, like it's the new C or what C++ should have been. Knowing that many people say wonders about the language, I'm wondering how much time usually takes to a language to become popular. This is, having libraries ported or written natively for this language and being used in serious software development. I have read about the history of Java, and Python to figure it out, but may be they are too high level complexity to say their development could take the same time as will take for D.

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• Is component-based design an architectural pattern or design pattern?

  - by xEnOn

  When using the component-based paradigm in game development with engines like Unity, is component-based design an architectural pattern, or a design pattern? Can I even say that component-based design is my "main" architectural pattern for my game? I see architectural patterns as being more high-level than design pattern. The component-based design in game development's context (like with Unity engine) seems to fit as an architectural pattern to me. However, on some sites, I read that component-based design is a behavioural pattern, much like other behavioural design patterns, and not so much like an architectural pattern like MVC.

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• finding a WUXGA or matte laptop

  - by John Paul Cook

  UPDATED: HP still sells 17" WUXGA laptops - details in the new paragraph at the end. Lenovo, Dell, Sony and Sager do not sell a 1920x1200 (WUXGA) laptop. I understand that manufacturers provide what there is market demand for. I also understand that HDTV and the 1080p standard is heavily influencing both monitor and laptop screen resolutions. But I do not understand why there is so little demand for a WUXGA laptop. Nor do I understand the popularity of glossy displays. I really don't like to look...(read more)

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• Add ability to add tabs to the end of a line in Windows PowerShell ISE

  - by deadlydog

  Originally posted on: http://geekswithblogs.net/deadlydog/archive/2013/06/24/add-ability-to-add-tabs-to-the-end-of-a.aspxIn the preamble of an earlier post I mentioned that one of the little things that bugs me about Windows PowerShell ISE is that you can add tabs to the start of a line, but not to the end of a line.  This is likely because it would interfere with the tab-completion feature.  I still like to be able to put tabs on the end of my code lines though so that I can easily line up my comments.  Here is how we can achieve this functionality in PowerShell ISE. Read more at http://blog.danskingdom.com/add-ability-to-add-tabs-to-the-end-of-a-line-in-windows-powershell-ise/

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• High level overview of Visual Studio Extensibility APIs

  - by Daniel Cazzulino

  If your head is dizzy with the myriad VS services and APIs, from EnvDTE to Shell.Interop, this should clarify a couple things. First a bit of background: APIs on EnvDTE (DTE for short, since that’s the entry point service you request from the environment) was originally an API intended to be used by macros. It’s also called the automation API. Most of the time, this is a simplified API that is easier to work with, but which doesn’t expose 100% of what VS is capable of doing. It’s also kind of the “rookie” way of doing VS extensibility (VSX for short), since most hardcore VSX devs sooner or later realize that they need to make the leap to the “serious” APIs. The “real” VSX APIs virtually always start with IVs, make heavy use of uint, ref/out parameters and HResults. These are the APIs that have been evolving for years and years, and there is a lot of COM baggage. ...Read full article

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• Where do lucid-updates come from?

  - by timbooo

  Considering the following command: # apt-get --simulate --show-upgraded upgrade Reading package lists... Done Building dependency tree Reading state information... Done The following packages will be upgraded: libimobiledevice0 libpam-ck-connector libparted0debian1 Inst libimobiledevice0 [0.9.7-1ubuntu1] (0.9.7-1ubuntu1.2 Ubuntu:10.04/lucid-updates) Inst libpam-ck-connector [0.4.1-3ubuntu1] (0.4.1-3ubuntu2 Ubuntu:10.04/lucid-updates) Inst libparted0debian1 [2.2-5ubuntu5.1] (2.2-5ubuntu5.2 Ubuntu:10.04/lucid-updates) [...] I can read an Inst line as the following: Inst <package> [<oldversion>] (<newversion> Ubuntu:10.04/lucid-updates) Can someone tell me where the Ubuntu:10.04/lucid-updates comes from? - Considering an own repository, how is this configurable?

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• Dynamic tests with mstest and T4

  - by Victor Hurdugaci

  If you used mstest and NUnit you might be aware of the fact that the former doesn't support dynamic, data driven test cases. For example, the following scenario cannot be achieved with the out-of-box mstest: given a dataset, create distinct test cases for each entry in it, using a predefined generic test case. The best result that can be achieved using mstest is a single testcase that will iterate through the dataset. There is one disadvantage: if the test fails for one entry in the dataset, the whole test case fails. So, in order to overcome the previously mentioned limitation, I decided to create a text template that will generate the test cases for me. As an example, I will write some tests for an integer multiplication function that has 2 bugs in it: Read more >> [Cross post from victorhurdugaci.com]

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• Learning Programming, Suggestions for a roadmap

  - by RisingSun

  Hi, Some background first- I am new to programming and have discovered it rather late in life; Like many hobbyists, my introduction to the subject has been through php/jquery (yes, i know the popular mood around here... they-are-not-real-programminng-languages ;-) ). I like to believe that I am reasonably competent at what I do in my other life and this developing addiction to coding has taken a very heavy toll on my professional prospects. This is the question: What programming languages next? (No plans to ditch php in the immediate future, that will involve rewriting much of my code) Any absolutely essential books I must read? Is it necessary to join a college/university course? Do I need to ditch my other profession to continue serious learning? My goals are: Develop a solid understanding of the science and art of programming. Continue to work on my own web application (Hands on learning suits me best) I am something of a generalist interested in everything from UI to database performance

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• Consistency of DirectX models

  - by marc wellman

  Is there a way to check the consistency of a DirectX model (.x) ? Whilst compiling .x files with XNA GameStudio 3.1 compilation is aborted with the following error message: Error 2 Could not read the X file. The file is corrupt or invalid. Error code: D3DXFERR_PARSEERROR. C:\WFP\Browser\Content\m.x KiviBrowser Some models compile correctly without any error/warning and some abort as described. The files of each model have several thousand lines. I am creating the files in Googles SketchUp 8 where they all look fine and don't show any sign of corruption. Suppose I have such a model my XNA compiler won't compile because their is an inconsistency somewhere in the file - how could I identify this in order to correct it ?

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• PASS Summit Location Redux

  - by andyleonard

  Introduction To quote Ronald Reagan, " There you go again ." The Professional Association for SQL Server (PASS) is considering locations for future PASS Summits. The apparent answer is: You Can Have The Summit Anywhere You Want... ... as long as it's in Seattle. PASS conducted a survey on this about a year ago, and I commented on the results and PASS' (mis-)interpretation of said results in a post entitled On PASS Summit Locations, Time Will Tell . "It's About Community" I think every member of the...(read more)

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