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  • Real-world use cases for Smalltalk

    - by Andrea Spadaccini
    Hello, I've been playing a bit with Smalltalk, and I found it interesting. I know that there are some classical examples of Smalltalk: the Smalltalk images themselves and the Seaside web framework, and that there are lots of in-house custom applications built using this language. I'd like to know if: there are computer applications actively used and developed apart from the ones I mentioned. there are software houses that use Smalltalk for doing their job when would you use Smalltalk instead of another language for developing from scratch a new application

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  • Need help understanding a recursion example in Python

    - by Ali Mustafa
    Python is my first programming language, and I'm learning it from "How to Think Like a Computer Scientist". In Chapter 5 the author gives the following example on recursion: def factorial(n): if n == 0: return 1 else: recurse = factorial(n-1) result = n * recurse return result I understand that if n = 3, then the function will execute the second branch. But what I don't understand is what happens when the function enters the second branch. Can someone explain it to me?

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  • Cannot dual Windows XP and Ubuntu

    - by Fabio Machado
    I am new to Ubuntu and at the moment I am trying to get Ubuntu 12.10 to one of my machines. The machine is a Pentium 4 @ 3.06, 2Gb RAM, 200GB Hard Drive and a NVidia GeForce 8800 GT. A few days ago, I tried Ubuntu without installing and it worked perfectly. Yesterday, I decided to formatted the hard drive and divide my hard drive into four partitions: 1 for the XP, 1 for Ubuntu, 1 for swamp and 1 where I will have my documents. Everything went great, I installed XP and then Ubuntu but I did something wrong on the partition window (Ubunto partion window) that I ended up without boot loader. This morning, I formatted everything again, installed XP and when I went to install Ubuntu (with the same DVD as before) the problems started. First, I had a black screen with a msg written with white text saying something like: unable to find a medium containing a live file system. After I burned another CD and tried again, I got stuck at the red dots (loading screen). I then went online and I read somewhere that it could be the CD, so I checked the integrity of the CD and everything was fine. I also unplugged all USBs connected to the computer and nothing changed. I goggled further options to try to solve my problem and some users suggested that people having these types of problems should try the alternate installation, which if I am not wrong is for networks. I then tried to install and yes the installation process was different from the normal CD, but it did get stuck on a page where it was doing something, like: ...finding ethd0 and it was stuck on the 100%. I tried USB installation as well and it also got stuck at the red dots (I do not have USB 3.0 on the computer in question). I have burned 5 different CD's and all at low speed. I checked the integrity and all are fine. I downloaded other distribution as well as other versions of Ubuntu and I still cannot install or even run the Live CD of Ubuntu or any other distribution. What is really annoying me is that everything was working perfectly before, when I first tried to install Ubuntu. Anyway, any help is welcome. Edit: My boot load is normal, no errors and all the hardware is working fine. I forgot to mention that after the loading screen (red dots) gets stuck, the DVD drive and the hard drive goes into idle state. I also restored the default values of the BIOS and no luck.

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  • terminal does not find xmonad.hs

    - by arpho
    Iam using xmonad on ubuntu 13.04, in ~/.xmonad my computer has the file xmonad.hs, if I try to read it from terminal using nano it opens a new file, I can access the file opening it from geany or gedit, but if I try to recompile it, the system does not find that file, so I cannot configure xmonad, every thing I try on this file from console does not work, because terminal even if I am root cannot see it, can you help me solve this issue?

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  • A Slice of Raspberry Pi

    - by Phil Factor
    Guest editorial for the ITPro/SysAdmin newsletter The Raspberry Pi Foundation has done a superb design job on their new $35 network-enabled Linux computer. This tiny machine, incorporating an ARM processor on a Broadcom BCM2835 multimedia chip, aims to put the fun back into learning computing. The public response has been overwhelmingly positive.Note that aim: "…to put the fun back". Education in Information Technology is in dire straits. It always has been, but seems to have deteriorated further still, even in the face of improved provision of equipment.In many countries, the government controls the curriculum. It predicted a shortage in office-based IT skills, and so geared the ICT curriculum toward mind-numbing training in word-processing and spreadsheet skills. Instead, the shortage has turned out to be in people with an engineering-mindset, who can solve problems with whatever technologies are available and learn new techniques quickly, in a rapidly-changing field.In retrospect, the assumption that specific training was required rather than an education was an idiotic response to the arrival of mainstream information technology. As a result, ICT became a disaster area, which discouraged a generation of youngsters from a career in IT, and thereby led directly to the shortage of people with the skills that are required to exploit the potential of Information Technology..Raspberry Pi aims to reverse the trend. This is a rig that is geared to fast graphics in high resolution. It is no toy. It should be a superb games machine. However, the use of Fedora, Debian, or Arch Linux ARM shows the more serious educational intent behind the Foundation's work. It looks like it will even do some office work too!So, get hold of any power supply that provides a 5VDC source at the required 700mA; an old Blackberry charger will do or, alternatively, it will run off four AA cells. You'll need a USB hub to support the mouse and keyboard, and maybe a hard drive. You'll want a DVI monitor (with audio out) or TV (sound and video). You'll also need to be able to cope with wired Ethernet 10/100, if you want networking.With this lot assembled, stick the paraphernalia on the back of the HDTV with Blu Tack, get a nice keyboard, and you have a classy Linux-based home computer. The major cost is in the T.V and the keyboard. If you're not already writing software for this platform, then maybe, at a time when some countries are talking of orders in the millions, you should consider it.

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  • Lightning is not compatible with Thunderbird 7.0.1

    - by Fredrik
    I reinstalled Ubuntu 11.10 the other day and now when I try to install the Lightning extension in Thunderbird it states: Lightning is not compatible with Thunderbird 7.0.1. As extra information lightning is not comming up automaticly when searching for it within Thunderbird. You need to download it manually. And also I had it installed before I reformated the computer. Anybody has a solution to this issue?

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  • Zombie Survival Gear and Critical Survival Skills Chart

    - by Asian Angel
    Halloween is fast approaching and what more opportune time could there be for the Zombie Apocalypse to finally occur? Be prepared with the right survival gear and skills to safely see you through it using this handy guide! Zombie Survival Gear [infographic] [via Cheeseburger Network] What To Do If You Get a Virus on Your Computer Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked HTG Explains: What is the Windows Page File and Should You Disable It?

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  • How to Create a Vacation Away Message for (Almost) Any Email Account

    - by Taylor Gibb
    If you are heading out of town, you might want to put a note on your email to let people know where to contact you. Or just to let them know to contact somebody else while you’re away. Here’s how to setup a vacation responder for (almost) any email account. How to See What Web Sites Your Computer is Secretly Connecting To HTG Explains: When Do You Need to Update Your Drivers? How to Make the Kindle Fire Silk Browser *Actually* Fast!

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  • Do I need to replace my hard disk?

    - by Sneha Kamath
    Hello everyone. Whenever I start my computer Ubuntu pops up the following error: A hard disk may be failing one or more hard disk report health problems A friend of mine ran some test and it was found that my hard disk has 74 bad sectors. Is this merely a software issue that will be solved after a complete format of my hard disk, or is it a hardware issue and I will have to replace my hard disk? Awaiting your responses. Thanks, Sneha Kamath.

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  • Add a database to use with locate command

    - by Pedro Teran
    i would like to know if anyone knows how I can create a database of a file system on my computer. so I can choose this data base to search for files on this file system efficiently. I ask this question since in man locate I found that I can choose a database for a different file system. Also would be grate if /var/lib/mlocate/mlocate.db database can have the data of 2 disks any approach ideas or others would be greatly appreciated

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  • Where is Ubuntu-tweak?

    - by Ubuntu-tweak
    I have a netbook and I need to clean it, I got odkas on ubuntu-tweak, and skousela be installed by navodu. Ale unfortunately I have not found it nor the software for Ubuntu, though here it skousela look so show me dostupny. Jako not from there at all neni. Prosim advice about how accurate the description should he do it so I could nainstalovat. A Please can I come up with some error about everything in the computer mam? Original post in Czech

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  • Don Knuth and MMIXAL vs. Chuck Moore and Forth -- Algorithms and Ideal Machines -- was there cross-pollination / influence in their ideas / work?

    - by AKE
    Question: To what extent is it known (or believed) that Chuck Moore and Don Knuth had influence on each other's thoughts on ideal machines, or their work on algorithms? I'm interested in citations, interviews, articles, links, or any other sort of evidence. It could also be evidence of the form of A and B here suggest that Moore might have borrowed or influenced C and D from Knuth here, or vice versa. (Opinions are of course welcome, but references / links would be better!) Context: Until fairly recently, I have been primarily familiar with Knuth's work on algorithms and computing models, mostly through TAOCP but also through his interviews and other writings. However, the more I have been using Forth, the more I am struck by both the power of a stack-based machine model, and the way in which the spareness of the model makes fundamental algorithmic improvements more readily apparent. A lot of what Knuth has done in fundamental analysis of algorithms has, it seems to me, a very similar flavour, and I can easily imagine that in a parallel universe, Knuth might perhaps have chosen Forth as his computing model. That's the software / algorithms / programming side of things. When it comes to "ideal computing machines", Knuth in the 70s came up with the MIX computer model, and then, collaborating with designers of state-of-the-art RISC chips through the 90s, updated this with the modern MMIX model and its attendant assembly language MMIXAL. Meanwhile, Moore, having been using and refining Forth as a language, but using it on top of whatever processor happened to be in the computer he was programming, began to imagine a world in which the efficiency and value of stack-based programming were reflected in hardware. So he went on in the 80s to develop his own stack-based hardware chips, defining the term MISC (Minimal Instruction Set Computers) along the way, and ending up eventually with the first Forth chip, the MuP21. Both are brilliant men with keen insight into the art of programming and algorithms, and both work at the intersection between algorithms, programs, and bare metal hardware (i.e. hardware without the clutter of operating systems). Which leads me to the headlined question... Question:To what extent is it known (or believed) that Chuck Moore and Don Knuth had influence on each other's thoughts on ideal machines, or their work on algorithms?

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  • 24HOP & SQLRally News

    - by NeilHambly
    24 Hours of PASS The Spring 2012 SQLPASS 24 hours of PASS event is a WHOLE DAY {Yes 24 hours’ worth} of SQL session exploding right onto computer screen’s near you When: 21st March 2012 - 1 session every hour on the hour for a full 24 hours The full agenda contains all the exciting details for each of the sessions & the speakers delivering the session But just in case, the ones you can't make it too on the day, you can watch them at a later time But you'll be attending mine LIVE of course...(read more)

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  • Can I stream Netflix to Ubuntu via a Mac?

    - by Chan-Ho Suh
    Right now I'm dual-booting Ubuntu and OS X. The only thing I use OS X for is watching the DRM-ed Netflix stream. I've looked into ways of watching Netflix on Ubuntu, but it seems the DRM basically makes that impossible (Moonlight project says unless Netflix drops the DRM their Silverlight replacement will not allow watching of Netflix). But then I realized, hey what if I stream Netflix to another computer running say, OS X, then somehow redirect it (using Unix magic) to my Ubuntu machine? Is this possible?

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  • Ati2dvag Blue Screen Problem

    If your computer has just been getting slower and slower since you bought it and errors are becoming more frequent, it';s time for a tune up. This means running the latest updates, using security appl... [Author: Nathan Tyler - Computers and Internet - March 24, 2010]

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  • How do I get my clipboard (copy and paste) working again?

    - by Alex Black
    I'm running Ubuntu 9.04, and out of the blue I can no longer cut and paste, I imagine if I restart my computer I'll be able to, but thats a pain, how can I fix/reset the clipboard? Type "hello" into Text Editor Highlight the text "hello" Press CTRL-C See the text become unhighlighted (is this normal?) Press CTRL-V See the word "network" get pasted in.. perhaps that was the last thing I copied when it was still working?

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  • power management of USB-enclosed hard drives

    - by intuited
    With a typical USB hard drive enclosure, is the full range of drive power management functionality available? In what may be an unrelated matter: is it possible to suspend a PC without unmounting an attached USB-powered drive, and then remounting it on resume? This is the behaviour I'm currently seeing (running Ubuntu linux 10.10). Are there certain models or brands that provide more complete control over this aspect of drive operation? My Friendly Neighbourhood Computer Store carries (part of) the Vantec Nexstar product line.

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  • Taking 10 minutes to boot up!

    - by oshirowanen
    Just added 2 pci-e to ide cards in my computer so I can use 2 old ide hard drives. Everything works fine, except the OS booting time has gone from about 10 seconds to about 10 minutes... I'f I remove both cards, it takes about 10 seconds to boot up, if I add either 1 of the cards back in, it still takes 10 seconds to boot up, but as soon as I have both cards in, it takes about 10 minutes. Why would this be happening?

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  • Why Solid-State Drives Slow Down As You Fill Them Up

    - by Chris Hoffman
    The benchmarks are clear: Solid-state drives slow down as you fill them up. Fill your solid-state drive to near-capacity and its write performance will decrease dramatically. The reason why lies in the way SSDs and NAND Flash storage work. Filling the drive to capacity is one of the things you should never do with a solid-state drive. A nearly full solid-state drive will have much slower write operations, slowing down your computer.    

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  • Is Btrfs in Maverick considered stable?

    - by Hamish Downer
    I'm upgrading my laptop to Maverick (10.10) and I noticed btrfs is an option for the filesystem. I read a while ago that the Ubuntu team weren't sure if it was going to be stable for Maverick. Does anyone know (with references) if it was approved for stable use? Any other pros and cons? For the moment I've made my root partition ext4 and my home partition btrfs, but I could reinstall. My laptop is a secondary computer.

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  • Creating a programming crossword puzzle

    Most programming-related crossword puzzles are generated by computer programs, and consequently lack the design and wordplay which makes New York Times-style crossword puzzles interesting. I decided that I could do better.

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