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• Developing a computer system based on Nand2Tetris [on hold]

  - by Ryan

  I recently finished a book called Nand2Tetris (nand2tetris.org) where I built my own computer system from scratch with its own machine language, assembly code, and a high level language called Jack that's translated to Hack binary. However, I feel like the "computer" I built throughout the course of this book (called the Hack computer) is a bit too simple for various reasons: 1) There are only two registers (D and A), whereas most computers have much more 2) Peripheral devices like mouse and keyboard have to be directly implemented 3) Peripheral devices use a pre-planned shared memory map to communicate with the CPU instead of using interrupts (which aren't covered at all) 4) Jack (the high level language) code doesn't compile to Assembly code directly, instead it compiles to an intermediate language, which in turn gets translated to Assembly. 5) There is no ROM or permanent storage device, everything is stored in RAM 6) No support for colored monitor, networking or sound I would like to build a more complicated computer system now based on what I've learned from Nand2Tetris. Does anyone know of any good resources or books to get started on this? (BTW by computer system I mean software that can emulate the hardware of a virtual computer with its own unique instruction set)

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• How to get notfications of ppa updates?

  - by maxschlepzig

  How can I get notified of updates to a certain PPA? For example when I am interested in new package versions of a certain package in a certain PPA? If a user has the package in question installed and is using the default desktop, she probably get notified via an icon in the traybar or something like that. But I am searching for a method which works even when the package is not installed (and without gnome). It should be reliable and prompt. Does launchpad provides some RSS/Atom-Feed features for PPAs? Or email notifications? (As a sidenote: I am surprised that even with my own PPA I only get an upload notification via mail - but no notification when the binary package is finished.)

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• Pronunciation in programming?

  - by Xepoch

  How do you correctly or erroneously pronounce programming terms? Any that you find need strict correction or history into the early CS culture? Programming char = "tchar" not care? ! = bang not exclamation? # = pound not hash? Exception #! = shebang * = splat not star? regex = "rej ex" not "regg ex"? sql = "s q l" not "sequel" (already answered, just i.e.) Unixen | = pipe not vertical bar? bin = bin as in pin , not as in binary? lib = lib as in library , not as in liberate? etc = "ett see" , not "e t c" (as in /etc and not "&c") Annoyance / = slash not backslash LaTeX = "laytek" not "lay teks"

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• Can I minify Javascript that requires copyright notice?

  - by Nathan Long

  I guess this is actually a legal question, but it relates to software. I'm about to include a JS plugin in a project. The comments include: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Is using this in my web site "redistribution?" If I minify this to conserve bandwidth, I assume it will strip all comments. If the answer to #1 is yes, doesn't that imply I'm legally not allowed to minify it? (That would stink, since I was planning to auto-minify all JS as part of the deploy process.)

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• True Excel Templates for BI Publisher

  - by Annemarie Provisero

  ADVISOR WEBCAST: True Excel Templates for BI Publisher PRODUCT FAMILY: EBS/ATG/BI Publisher July 12, 2011 at 7am PT, 8 am MT, 10 am ET This one-hour session is recommended for technical and functional users who want to learn how to code Excel formatted layouts for use with BI Publisher to generate binary Excel output. TOPICS WILL INCLUDE: Creating a simple template Formatting Dates Creating Functions A short, live demonstration (only if applicable) and question and answer period will be included. Oracle Advisor Webcasts are dedicated to building your awareness around our products and services. This session does not replace offerings from Oracle Global Support Services. Click here to register for this session ------------------------------------------------------------------------------------------------------------- The above webcast is a service of the E-Business Suite Communities in My Oracle Support. For more information on other webcasts, please reference the Oracle Advisor Webcast Schedule.Click here to visit the E-Business Communities in My Oracle Support Note that all links require access to My Oracle Support.

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• About to graduate from good school without any progamming skills

  - by newprint

  Not sure if it is good place to ask this question, but found this section to be suitable. I am about to graduate from a good school (in the US) with Computer Science degree, having good grades and high GPA. I have no freaking clue how to write a good program, how to properly test it... nada, zero. We were never been taught how to write software. Ye, sure the Comp. Architecture class is important, and I can tell you a lot about how MIPS processor works, and I can tell you about Binary Trees and Red-Black Trees and running time of operations in Big Oh, but it has nothing to do with programming in "real" life. For god sake, none of my classmates know how to use STLs or write templated code! To be honest, I found that many of my classes to be waste of time. What should I do ? How to step into real life and learn how to program ?

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• JDK 7 In Action - Learn With Java Tutorials and Developer Guides

  - by sowmya

  At JavaOne 2012, Stuart Marks, Mike Duigou, and Joe Darcy gave a presentation about JDK 7 In Action. Learn more about using JDK 7 features with the help of Java Tutorials and JDK 7 Developer Guides. Links to relevant information are provided below. If you are considering moving to JDK 7 from a previous release, the JDK 7 Release Notes and JDK 7 Adoption Guide are great resources. Project Coin Features Improved Literals * Literals section in Primitive Datatypes topic. * Binary Literals * Underscores in Numeric Literals Strings In Switch * Strings In Switch Diamond * Type Inference for Generic Instance Creation * Type Inference and Instantiation of Generic Classes Multi-catch and Precise Throw * Catching Multiple Exception Types and Rethrowing Exceptions with Improved Type Checking * Catch Blocks Try-with-resources * The try-with-resources Statement NIO.2 File System API * File I/O for information on path, files, change notification, and more * Zip File System Provider * Zip File System Provider * Developing a Custom File System Provider Fork Join Framework * Fork/Join - Sowmya

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• What Counts for A DBA - Logic

  - by drsql

  "There are 10 kinds of people in the world. Those who will always wonder why there are only two items in my list and those who will figured it out the first time they saw this very old joke."  Those readers who will give up immediately and get frustrated with me for not explaining it to them are not likely going to be great technical professionals of any sort, much less a programmer or administrator who will be constantly dealing with the common failures that make up a DBA's day.  Many of these people will stare at this like a dog staring at a traffic signal and still have no more idea of how to decipher the riddle. Without explanation they will give up, call the joke "stupid" and, feeling quite superior, walk away indignantly to their job likely flipping patties of meat-by-product. As a data professional or any programmer who has strayed  to this very data-oriented blog, you would, if you are worth your weight in air, either have recognized immediately what was going on, or felt a bit ignorant.  Your friends are chuckling over the joke, but why is it funny? Unfortunately you left your smartphone at home on the dresser because you were up late last night programming and were running late to work (again), so you will either have to fake a laugh or figure it out.  Digging through the joke, you figure out that the word "two" is the most important part, since initially the joke mentioned 10. Hmm, why did they spell out two, but not ten? Maybe 10 could be interpreted a different way?  As a DBA, this sort of logic comes into play every day, and sometimes it doesn't involve nerdy riddles or Star Wars folklore.  When you turn on your computer and get the dreaded blue screen of death, you don't immediately cry to the help desk and sit on your thumbs and whine about not being able to work. Do that and your co-workers will question your nerd-hood; I know I certainly would. You figure out the problem, and when you have it narrowed down, you call the help desk and tell them what the problem is, usually having to explain that yes, you did in fact try to reboot before calling.  Of course, sometimes humility does come in to play when you reach the end of your abilities, but the ‘end of abilities’ is not something any of us recognize readily. It is handy to have the ability to use logic to solve uncommon problems: It becomes especially useful when you are trying to solve a data-related problem such as a query performance issue, and the way that you approach things will tell your coworkers a great deal about your abilities.  The novice is likely to immediately take the approach of  trying to add more indexes or blaming the hardware. As you become more and more experienced, it becomes increasingly obvious that performance issues are a very complex topic. A query may be slow for a myriad of reasons, from concurrency issues, a poor query plan because of a parameter value (like parameter sniffing,) poor coding standards, or just because it is a complex query that is going to be slow sometimes. Some queries that you will deal with may have twenty joins and hundreds of search criteria, and it can take a lot of thought to determine what is going on.  You can usually figure out the problem to almost any query by using basic knowledge of how joins and queries work, together with the help of such things as the query plan, profiler or monitoring tools.  It is not unlikely that it can take a full day’s work to understand some queries, breaking them down into smaller queries to find a very tiny problem. Not every time will you actually find the problem, and it is part of the process to occasionally admit that the problem is random, and everything works fine now.  Sometimes, it is necessary to realize that a problem is outside of your current knowledge, and admit temporary defeat: You can, at least, narrow down the source of the problem by looking logically at all of the possible solutions. By doing this, you can satisfy your curiosity and learn more about what the actual problem was. For example, in the joke, had you never been exposed to the concept of binary numbers, there is no way you could have known that binary - 10 = decimal - 2, but you could have logically come to the conclusion that 10 must not mean ten in the context of the joke, and at that point you are that much closer to getting the joke and at least won't feel so ignorant.

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• How do I install penmountlpc?

  - by ændrük

  I would like to install the penmountlpc touchscreen driver in Ubuntu 11.10 on a Dialogue Flybook A33i. When I try installing it from the source packed in penmountlpc-source_1.1_all.deb, I receive the following build error (see also the full build log): # Install the module cp penmountlpc.o debian/penmountlpc-modules-3.0.0-12-generic/lib/modules/3.0.0-12-generic/misc cp: cannot create regular file `debian/penmountlpc-modules-3.0.0-12-generic/lib/modules/3.0.0-12-generic/misc': No such file or directory make[1]: *** [binary-modules] Error 1 make[1]: Leaving directory `/usr/src/modules/penmountlpc' make: *** [kdist_build] Error 2 How can I resolve this problem?

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• Why is 2^16 a "special" number?

  - by javamonkey79

  OK, I feel stupid asking this - but in Jeff's article: Getting the Interview Phone Screen Right and originally stated in the 5 essential phone screen questions: They shouldn't stare blankly at you when you ask with 2^16 is. It's a special number. They should know it. I've been a developer\software engineer\code monkey\whatever for a little while now, and I don't think I've ever come across this. I mean, I can certainly count binary values do basic operations on them, etc, etc. But I don't see what is "special" about this value.

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• How do I start Nautilus as root?

  - by Pho swan

  I got problem with nautilus in Ubuntu 12.04 LTS when i run command "gksu nautilus /" password ask box appear and I type my super-user password , than password box is disappear and nautilus is not open. . when i try to open nautilus via normal user in command box . "nautilus" the folder is open up. when i try in terminal ... $sudo nautilus I got following error $ sudo nautilus / ** (nautilus:8523): WARNING **: Command line `dbus-launch --autolaunch=2c8ce9b7da2257c2609b749700000007 --binary-syntax --close-stderr' exited with non-zero exit status 1: Autolaunch error: X11 initialization failed.\n Could not parse arguments: Cannot open display: how can i fix this error..

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• Trying to run 32bit windows game in wine on 64bit 12.04

  - by georgelappies

  I am trying to run Icewind dale2 from GOG.com in wine on ubuntu 12.04 64bit. I am using the AMD ATI binary blob display driver. Running the file command on /usr/lib32/fglrx/libGL.so.1.2 gives: george@devbox:/usr/lib32/fglrx$ file libGL.so.1.2 libGL.so.1.2: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped george@devbox:/usr/lib32/fglrx$ So I definetly have 32bit opengl. I am using latest Playonlinux and tried this on wine 1.4 and 1.5... How can I force wine to use my opengl library?

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• What do I need to know about Data Structures and Algorithms in the "real" world

  - by Ray T Champion

  I just finished the data structures and algorithms course in school , I took it during the summer so 6wks course vs a 16 wk course during the regular semester. So not only was the course hard but it was really really really fast. My question is what do I need to know about data structures in the real world? I understand what they do and how they work, for the most part, but I had a real tough time coding them , I wouldn't be able to write the code for a binary tree class or a balanced tree class from scratch .... Is that bad? should I retake it , or is knowledge of how they work sufficient, without being able to write the classes from scratch?

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• Partition Configuration to avoid reinstalling applications after update

  - by nightcrawler

  The major bane when I update Ubuntu (which is way more frequent than Windows) is that I lose all installed application. To be precise I do a lot of Maple, Matlab, Geogebra & for all of those I install Java platform which too isnt very straightforward plus the license management things, which really give me craps. I don't install application in /home (to be made available to all users) thus a separate /home partition is meaningless. Can we circumvent this problem somehow such that Java dependent applications along with JDK doesn't blow away after update, may be by a separate partition (just like /home) where only custom (other than provided by Ubuntu Software Center) install application resides Further: I use specific binary of Java (Java6 update 32), its an important requirement for me, thus I don't want to let it crash/overwritten or similar

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• An intern interview with Microsoft [on hold]

  - by Wobbles

  I'm currently in my second year(Computer Science and Mathematics). In two days I have an interview on campus with Microsoft. I'm a bit nervous, because this will be my first in person interview. I have done reviewed basic things like linked list and binary trees. I am not really sure what kinds of questions I'll be asked. Has anyone been to such interview? If so what's it like? What kinds of questions will I be asked? Any help/suggestions will be much appreciated! Also can someone provide me with a list of things I ought to know for the interview?

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• Aptana Studio 3 does not start up in Ubuntu 12.10

  - by Agent47DarkSoul

  I followed the instructions provided here to install Aptana Studio 3 in my Ubuntu 12.10. I have completed all the steps with out any problems. When I click the Aptana icon in my Unity bar nothing happens. No error pops up! I gave permission on the sh file and on the directory (/opt/Aptana_Studio_3) but still same problem. If I try executing the sh file in the /opt/Aptana_Studio_3 folder, it says "Syntax error: "(" unexpected Aptana". Also I cannot execute the Aptana binary file directly. I have been trying to solve the problem for a while now. Any help would be much appreciated. EDIT: I have Oracle Java 7 installed. I have read some post about backwards compatibility problem with Java 6 but dont know whether that's the issue. I will edit the question if I find something new.

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• My own personal use of Oracle Linux

  - by wcoekaer

  It always is easier to explain something with examples... Many people still don't seem to understand some of the convenient things around using Oracle Linux and since I personally (surprise!) use it at home, let me give you an idea. I have quite a few servers at home and I also have 2 hosted servers with a hosted provider. The servers at home I use mostly to play with random Linux related things, or with Oracle VM or just try out various new Oracle products to learn more. I like the technology, it's like a hobby really. To be able to have a good installation experience and use an officially certified Linux distribution and not waste time trying to find the right libraries, I, of course, use Oracle Linux. Now, at least I can get a copy of Oracle Linux for free (even if I was not working for Oracle) and I can/could use that on as many servers at home (or at my company if I worked elsewhere) for testing, development and production. I just go to http://edelivery.oracle.com/linux and download the version(s) I want and off I go. Now, I also have the right (and not because I am an employee) to take those images and put them on my own server and give them to someone else, I in fact, just recently set up my own mirror on my own hosted server. I don't have to remove oracle-logos, I don't have to rebuild the ISO images, I don't have to recompile anything, I can just put the whole binary distribution on my own server without contract. Perfectly free to do so. Of course the source code of all of this is there, I have a copy of the UEK code at home, just cloned from https://oss.oracle.com/git/?p=linux-2.6-unbreakable.git. And as you can see, the entire changelog, checkins, merges from Linus's tree, complete overview of everything that got changed from kernel to kernel, from patch to patch, errata to errata. No obfuscating, no tar balls and spending time with diff, or go read bug reports to find out what changed (seems silly to me). Some of my servers are on the external network and I need to be current with security errata, but guess what, no problem, my servers are hooked up to http://public-yum.oracle.com which is open, free, and completely up to date, in a consistent, reliable way with any errata, security or bugfix. So I have nothing to worry about. Also, not because I am an employee. Anyone can. And, with this, I also can, and have, set up my own mirror site that hosts these RPMs. both binary and source rpms. Because I am free to get them and distribute them. I am quite capable of supporting my servers on my own, so I don't need to rely on the support organization so I don't need to have a support subscription :-). So I don't need to pay. Neither would you, at least not with Oracle Linux. Another cool thing. The hosted servers came (unfortunately) with Centos installed. While Centos works just fine as is, I tend to prefer to be current with my security errata(reliably) and I prefer to just maintain one yum repository instead of 2, I converted them over to Oracle Linux as well (in place) so they happily receive and use the exact same RPMs. Since Oracle Linux is exactly the same from a user/application point of view as RHEL, including files like /etc/redhat-release and no changes from .el. to .centos. I know I have nothing to worry about installing one of the RHEL applications. So, OL everywhere makes my life a lot easier and why not... Next! Since I run Oracle VM and I have -tons- of VM's on my machines, in some cases on my big WOPR box I have 15-20 VMs running. Well, no problem, OL is free and I don't have to worry about counting the number of VMs, whether it's 1, or 4, or more than 10 ... like some other alternatives started doing... and finally :) I like to try out new stuff, not 3 year old stuff. So with UEK2 as part of OL6 (and 6.3 in particular) I can play with a 3.0.x based kernel and it just installs and runs perfectly clean with OL6, so quite current stuff in an environment that I know works, no need to toy around with an unsupported pre-alpha upstream distribution with libraries and versions that are not compatible with production software (I have nothing against ubuntu or fedora or opensuse... just not what I can rely on or use for what I need, and I don't need a desktop). pretty compelling. I say... and again, it doesn't matter that I work for Oracle, if I was working elsewhere, or not at all, all of the above would still apply. Student, teacher, developer, whatever. contrast this with $349 for 2 sockets and oneguest and selfsupport per year to even just get the software bits.

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• SPARC Servers at Oracle OpenWorld

  - by B.Koch

  There is plenty to learn about the SPARC servers at the Oracle OpenWorld. The SPARC server sessions offer depth and breadth in content selection to satisfy everyone's need from the one who is technically oriented to the one who would like to understand more about the business value of SPARC technology. And, there is always more. Keynotes, Oracle innovations and many product demonstrations are only a few of many other opportunities to interact with the product experts and executives to establish greater insight to the Oracle SPARC technology. The Oracle SPARC Servers Oracle's SPARC servers running Oracle Solaris are ideal for mission-critical applications that require high performance, best-in-class availability, and unmatched scalability on all application tiers. With a robust roadmap, Oracle assures the highest levels of investment protection through 100% SPARC/Solaris binary compatibility, proven by hundreds of thousands of deployments over more than 20 year. 

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• Browser Alert -- cannot download links using Internet Explorer

  - by user554629

  Internet Explorer ( ie8, ie9 ) is mangling downloads from this blog. Links to files on this blog ( eg., dirstats ) are typically downloaded using browser:  R-click, SaveAs This works fine on Chrome, Firefox and Safari.  Internet Explorer is not handling the html reference to the file, and adds .html to the filename.   The file will be saved in an incorrect format.   Relatively harmless for a script file that is plain text, but binary files like obiaix.tar.gz , will be corrupted, and there is nothing you can do about it. "Don't get corrupted, get rid of cable  Internet Explorer, use firefox"  ( sorry, US TV advert reference ) The useful part of the compressed tar file is that you don't have to worry about Windows line-end characters corrupting the scripts, and you don't have to change execution permissions to get the scripts to work. dos2unix dirstats   chmod +x dirstats

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• Best approach to get clicked objects from a display list (2D)

  - by Ixx

  I'm implementing a display list to manage my visuals on screen. I want to know which object is clicked. My objects already have z-order variable. With my current knowledge (almost nothing) the only thing which comes to my mind is make a linear search and get all the objects which contains the clicked point. And then select the object with the highest z-order. But I know there are far better approaches. I think it's something with trees (binary search?). - container display objects and search recursively? just don't know where to start looking, for this concrete case. Any hint link or concrete solution is welcome.

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• Warning about unavailable repositories

  - by richzilla

  An icon has recently appeared on my panel with an exclamation mark. The message i get when hovering over this is that the update information is out of date, and that this may be caused by an unavailable repository or a network isssue. My network connection appears to be ok. The message advises i manually check for updates. When i do this, i get the following message: W:Failed to fetch http://ppa.launchpad.net///ubuntu/dists/maverick/main/source/Sources.gz 404 Not Found , W:Failed to fetch http://ppa.launchpad.net///ubuntu/dists/maverick/main/binary-amd64/Packages.gz 404 Not Found , E:Some index files failed to download, they have been ignored, or old ones used instead. Any idea whats going on?

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• What is the impact of a CMS on page load time versus a static site?

  - by PleaseStand

  I am creating a 20-page site that will go on shared hosting. Each page will be about 20 KB (including HTML, CSS, and images common to all pages). To avoid manually adding navigation elements to each page, I am considering using a CMS. However, I am concerned that on a busy server, using a CMS would make the site load more slowly. In a shared hosting environment where PHP is run as a CGI binary, how much does a CMS (WordPress, Drupal, etc.) generally affect page load time, compared to both "plain HTML" static sites and those using PHP as merely a templating language?

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• Isn't class scope purely for organization?

  - by Di-0xide

  Isn't scope just a way to organize classes, preventing outside code from accessing certain things you don't want accessed? More specifically, is there any functional gain to having public, protected, or private-scoped methods? Is there any advantage to classifying method/property scope rather than to, say, just public-ize everything? My presumption says no simply because, in binary code, there is no sense of scope (other than r/w/e, which isn't really scope at all, but rather global permissions for a block of memory). Is this correct? What about in languages like Java and C#[.NET]?

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• Get Final output from UDK

  - by EmAdpres

  ( sorry for my bad english in advance :D ) I'm trying to get a .exe setup output, from my UDK !( with my own maps and scripts which I made within MyGame) I tried UnrealFrontEnd! But It made a setup , that after installation I can see my .udk maps, my packages and etc. But It's not a real output that I can show to my customers. I don't want, other can use my resources ! So... How can I get a binary-like output from UDK as a real Game-Output ? ( like what we see in all commercial games ) Is there any option in frontend that I missed ?

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• In Search Data Structure And Algorithm Project Title Based on Topic

  - by Salehin Suhaimi

  As the title says, my lecturer gave me a project that i needed to finish in 3 weeks before final semester exams. So i thought i will start now. The requirement is to "build a simple program that has GUI based on all the chapter that we've learned." But i got stuck on WHAT program should i build. Any idea a program that is related to this chapter i've learned? Any input will help. list, array list, linked list, vectors, stacks, Queues, ADT, Hashing, Binary Search Tree, AVL Tree, That's about all i can remember. Any idea where can i start looking?

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