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  • How to organize functional programs

    - by bleakcabal
    In OOP, your basic unit of organization for code is the class. A frequently used methodology in Java, C# and similar languages is to organize your code around having one file for each class with the file name following the class name. You can consider each of these class as a unit of organization to group a single concept. These classes are in in namespaces which often follow the directory structure of the files in the solution/project. Namespaces are another level of organization. How are large projects in functional languages typically organized? How to you determine how to split your functions into different files? Are other units of grouping beside files used? How is code typically organized within a single file?

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  • Have You Downloaded SQL Server 2012 Evaluation Edition? Why Not?!

    - by andyleonard
    I am installing SQL Server 2012 Evaluation Edition on a virtual machine as I type. You can do this. Here’s one way: Grab some virtual machine software. I like Oracle VirtualBox . It’s cool. It’s free. Install VirtualBox. Download the 180-day free trial of Windows Server 2008 R2 . Also cool. Also free. Once Windows Server 2008 R2 is downloaded, build a VirtualBox VM. Download and install SQL Server 2012 Evaluation Edition ! That’s all there is to it. You can get started today, no need to wait until...(read more)

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  • Why are there different programming languages [closed]

    - by Velizar Hristov
    I'm not asking about the usefulness of the languages that do exist already: I already know, and agree, that different languages are better for different purposes. However, why don't they just have a single language that can do it all? Why, when C# was created, they didn't keep everything from C and C++ and just add a few things, so that it can be used as both a low-level and high-level language? I see no harm in adding all kinds of commands to a single language that would allow it to be good for everything, and even eliminate the need for all other languages. Someone from another thread said that if there's a flaw in a certain language, its successor might not have it. However, why don't we just update that language to remove the flaw, and/or add anything that's missing? Arrays are different in Java and C#, but why not have them both, just use different commands for them? And so on...

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  • Not able to create Live CD

    - by Jagannath Harati
    I downloaded 12.04.1 on a Windows 7 machine. I burnt a DVD from the ISO image using Windows Disc Image Burner. I had 'verify disc' on. The disc was created successfully with no errors. I was not able to use this disc for installing Ubuntu on another Windows 7 machine. I do not get the Welcome Screen on booting. I find that on the disc I burnt, I do not find bin, disc tree, programs directories and cdromupgrade, start.*, ubuntu* files. I found the boot directory and WUBI executable file. I tried downloading several times with the same result. I had similar problem earlier with 11.04. Can you please let me where the problem is?

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  • Printing Problem on Shared Printer

    - by paulus_almighty
    I'm using Ubuntu 11.10 on two machines. One has a USB printer connected. I want to share this printer with the other over the wireless network. Under Printing > Server > Settings: I have Publish shared printers connected to this system and Allow printing from the internet enabled. All other checkboxes are disabled. When I right click on the printer icon, I can see enabled and shared are ticked. On my other machine, I can now click on add network printer. It finds the machine name of the server and correctly identifies the printer. However, print test page fails. Under printer properties the printer state says: Processing - Unable to connect to printer; will retry in 30 seconds... What's gone wrong?

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  • Reboot only shuts down and doesn't actually boot again

    - by PherricOxide
    I'm running a fresh install of Ubuntu 12.04 Server on an abmx rack mount server. When I attempt to reboot with sudo shutdown -r now, the machine just shuts down and doesn't come back up without me manually pressing the power button. The output of last -x, runlevel (to lvl 2) 3.2.0-29-generic Wed Oct 31 14:32 - 14:37 (00:05) reboot system boot 3.2.0-29-generic Wed Oct 31 14:32 - 14:37 (00:05) shutdown system down 3.2.0-29-generic Wed Oct 31 14:30 - 14:32 (00:02) runlevel (to lvl 6) 3.2.0-29-generic Wed Oct 31 14:30 - 14:30 (00:00) This appears to show that the system rebooted, but it went dark (no power lights, BIOS, etc) and I had to go press the power button in order to make it boot back up. The machine does have some sort of Intel Boot Agent that usually appears before the BIOS, I'm wondering if it could be causing this. I'm not sure what information is useful for debugging this, but I put the output of lshw in http://pastebin.com/mBy72kTQ

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  • Java @Contented annotation to help reduce false sharing

    - by Dave
    See this posting by Aleksey Shipilev for details -- @Contended is something we've wanted for a long time. The JVM provides automatic layout and placement of fields. Usually it'll (a) sort fields by descending size to improve footprint, and (b) pack reference fields so the garbage collector can process a contiguous run of reference fields when tracing. @Contended gives the program a way to provide more explicit guidance with respect to concurrency and false sharing. Using this facility we can sequester hot frequently written shared fields away from other mostly read-only or cold fields. The simple rule is that read-sharing is cheap, and write-sharing is very expensive. We can also pack fields together that tend to be written together by the same thread at about the same time. More generally, we're trying to influence relative field placement to minimize coherency misses. Fields that are accessed closely together in time should be placed proximally in space to promote cache locality. That is, temporal locality should condition spatial locality. Fields accessed together in time should be nearby in space. That having been said, we have to be careful to avoid false sharing and excessive invalidation from coherence traffic. As such, we try to cluster or otherwise sequester fields that tend to written at approximately the same time by the same thread onto the same cache line. Note that there's a tension at play: if we try too hard to minimize single-threaded capacity misses then we can end up with excessive coherency misses running in a parallel environment. Theres no single optimal layout for both single-thread and multithreaded environments. And the ideal layout problem itself is NP-hard. Ideally, a JVM would employ hardware monitoring facilities to detect sharing behavior and change the layout on the fly. That's a bit difficult as we don't yet have the right plumbing to provide efficient and expedient information to the JVM. Hint: we need to disintermediate the OS and hypervisor. Another challenge is that raw field offsets are used in the unsafe facility, so we'd need to address that issue, possibly with an extra level of indirection. Finally, I'd like to be able to pack final fields together as well, as those are known to be read-only.

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  • X crash at login for 1 user

    - by marxjohnson
    User switching wasn't working on my 12.04 LTS desktop (just dropped me to TTY8 with a blinking cursor) so I tried to manually start a second X session by logging in to TTY6 and running startx -- :1. This didn't work either, and my machine locked up. Now when I try to log in as the second user from LightDM, X instantly crashes and I'm thrown back to the login screen. Other accounts on the machine work fine, and it happens for every desktop environment. I've had a poke around in my home directory, but I can't see anything obvious to change/delete to get it working again. Can anyone advise please?

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  • Cann't find shared folder anymore

    - by SoftTimur
    I use VMware Fusion under Mac, and I have installed Ubuntu 12.04 and Windows 7 as virtual machine. Under Ubuntu, by "shared folder", I used to manage a common folder with Mac via /mnt/hgfs/myfolder. Under Windows, I have set up so that this folder is also accessible. But today I cann't find myfolder anymore under /mnt/hgfs in Ubuntu, while it is still accessible via Windows (and Mac of cause). I tried to restart the machine, reset the sharing settings, it still does not work. Could anyone help?

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  • READ_ME_FIRST: What Do I Do All of Those SPARC Threads?

    - by user12608550
    New Oracle Technical White Paper: READ_ME_FIRST: What Do I Do All of Those SPARC Threads? Executive Overview With an amazing 1,536 threads in an Oracle M5-32 system, the number of threads in a single system has never been so high. This offers a tremendous processing capacity, but one may wonder how to make optimal use of all these resources. In this technical white paper, we explain how the heavily threaded Oracle T5 and M5 servers can be deployed to efficiently consolidate and manage workloads using virtualization through Oracle Solaris Zones, Oracle VM Server for SPARC, and Oracle Enterprise Manager Ops Center, as well as how to improve the performance of a single application through multi-threading. READ_ME_FIRST: What Do I Do All of Those SPARC Threads?

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  • Determining an application's dependencies

    - by gpuguy
    I have developed an application using Windows Forms in C++ (IDE MS VC++ 2010). Some parts of the application also use MFC, and OpenCV. I want to send the application to my cleint for interim testing on his own machine. I have not developed any installer for the application, so I will be sending him an .EXE file. I want the client to not face any difficulties in replicating the environment, and therefore not lose any time. Can somebody suggest me what software (such as MS VC++ Runtime, .NET Framework, Windows SDK, etc.) should be installed on the client's machine for successfull testing of the application? Note: The OS (Windows 7) and hardware are exactly the same on both sides.

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  • Installing SQL Server 2012 on Windows 2012 Server

    - by andyleonard
    In Want to Learn SQL Server 2012? I wrote about obtaining a fully-featured version of SQL Server 2012 (Developer Edition). This post represents one way to install SQL Server 2012 Developer Edition on a Hyper-V virtual machine running the Windows 2012 Server Standard Edition operating system. This is by no means exhaustive. My goal in writing this is to help you get a default instance of SQL Server 2012 up and running. I do not cover setting up the Hyper-V virtual machine. I begin after loading the...(read more)

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  • Where do you get new software ideas from? [closed]

    - by Cape Cod Gunny
    The world of software creation is very competitive. I've heard it said to be successful you need to be the first one with the idea. Everyone knows how Bill Gates created IBM DOS on one machine while simultaneously building MS-DOS on another machine (and we all know how that turned out). In order to be the first to come up with a new software product, where do you go looking for fresh ideas? Update 06/26/13: Reworded this question in an attempt to get it reopened. Bill Gates developed MS-DOS at the same time he was hired to develop IBM DOS. As a programming community, we would all gain by understanding how to think up great ideas for software. As programmer we tend to get stuck in our thinking... it's refreshing to hear how fellow programmers busted out and came up with their ideas. It's not very likely that we will have an MS-DOS opportunity like Bill Gates. Please vote to reopen.

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  • Do I need multiple accounts in Facebook for each of my product site?

    - by John
    I've a dozen sites which include for-profit ones as well as for charity. For each site I've created a Facebook company/charity account. After creating those accounts it dawned on me that I could as well have created a new page for each of my site from my personal account only even if a site has multiple product pages. What'll be the right strategy? Also as per Facebook terms we can have only single personal account. I do have single personal account only but for each site I've created only company pages. I hope I'm not violating the facebook terms.

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  • Redisigning an old site, structure change etc

    - by RhymeGuy
    I have an old site built in 2006, it has around 200 pages and 500 pictures. Every single page is of course indexed as well as images. It is very well ranked for targeted keywords and I receive good amount of SEO traffic (I guess that's due the various campaigns, branding, ppc, etc..) Problem: Site has outdated design, pages and images have not so proper names, there are no heading and alt tags, it was built in tables, inline CSS etc.. Goal: Complete redisign site, use divs, change file names, add proper meta data, alt tags etc.. Question: How this can affect current SEO positions? I will redirect (301) every single page to the new one, build site map, but what to do with images? Do I need to redirect them also? Any other suggestion?

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  • How to end a relationship with a client without pissing them off?

    - by thesam18888
    Here's my situation: I'm a freelancing student and I was working on a software project for a client over the summer holidays of 2010. At the time I completed the application, tested it on my machine, delivered it to the client and went back to University. However the client is not completely satisfied with the product and apparently has found a couple of bugs with it. Ever since I went back to Uni, they have been chasing me up and asking me to spend some time to fix the bugs. I have explained that this is simply not possible as I am extremely busy with my Uni work and cannot afford to spare my time for anything else. The client is getting increasingly pissed off and have been chasing me by calling during lectures at evenings and even asking me if I could go over to their place over the weekend to talk about this. This is in turn pissing me off as well because they're essentially asking me to give up my education so that I could help them out by fixing bugs. I go to Uni 5 days a week, 9-6 and feel it is unreasonable for them to call me during evenings and to ask me to work over weekends etc. I would like to end my relationship with this client but would like to do it amicably without pissing them off. How can I do this? I really wish they would just find someone else but I was charging them piss-poor rates so I think they don't want to go to anyone else because they would have to pay more. EDIT The application does not seem to work perfectly on their machine. I had tested it extensively on my machine and it seemed to work fine. I am not sure what exactly is causing it to not work. I was paid a very low amount and it was on an hourly basis. e.g. I would send an invoice saying I worked on this for x amount of hours and they would pay me for it. Apart from the work itself, I have not charged them for all the time spent sending e-mails back and forth, phone calls, visits to their place etc. I would really like to end all my dealings with this client right away.

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  • Ubuntu 12.10 WiFi Problems

    - by Sean Webber
    I have a 32 bit machine running Ubuntu 12.10 with WiFi on it. I have a WPA2 network at home, but if I leave the USB Adapter plugged in while it boots, it infinitely keeps asking for the network password but never connects. If I plug it in after boot, it will connect but then I can't access ANYTHING on the LAN or Internet because "the DNS servers are unreachable". Now, if I leave the computer on a while, I get lucky sometimes and it MAGICALLY decides to connect for a little bit, lock the machine though and the Internet's gone again. The weirdest thing, is when I am connected but can't get to the internet, I do a netstat or ifconfig wlan0, I do have an IP address and everything. It says I'm connected but its not. I have a Realtek RTL8188CU USB adapter.

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  • Is it better to cut and store all sprites needed from a spritesheet in memory, or cut them out just-in-time?

    - by xLite
    I'm not sure what's best practice here as I have little experience with this. Essentially what I am asking is... if it's better to get your single PNG with all your different sprites on it for use in-game, cut out every sprite on startup and store them in memory, then access the already-cut-out sprite from memory quickly or Only have the single PNG with all the different sprites residing in memory, and when you need, for example, a tree. You cut out the tree from the PNG and then continue to use it as normal. I imagine the former is more CPU friendly than the latter but less memory friendly, vice versa for the latter. I want to know what the norm is for game dev. This is a pixel based game using 2D art. Each PNG is actually an avatar's sprite sheet with each body part separated and then later joined to form the full body of the avatar.

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  • How do I output my audio input?

    - by VarLogRant
    A few iterations ago, I think this was Jaunty but could've been before, I would plug a 1/8" audio cable from the line-out of a Windows netbook to the line-in of my Ubuntu machine, so I would have all the sound from both machines without having to plug both into a mixer which I don't have. I didn't do this much, as I was pretty-much happy with Banshee at the time. But with Karmic, and still with Lucid, I can only get the output if I'm recording with Audacity. Which I'm not going to do from my web-development and systems programming workstation. I can tell by plugging in headphones that my netbook has audio out working. I can see Sound Preferences that the Ubuntu machine is receiving them. I just want the old behavior back. Help?

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  • HP Pavilion G6 1209 temperature higher than usual and fan working in 11.10

    - by vanjadjurdjevic
    Installing Ubuntu on this new machine i had various problems, so I asked around ask ubuntu for a solution. This is the latest one! :D When I start the pc it shows the temperature around 50-55. When I open chromium it shows 60+ (61,62,63). It even gets to 67-68 when multi-tasking 2 apps. The fan is working slightly louder than in windows 7. Talking about windows 7, the temperature is 45-50 when idle, 50-53 when working in browser. Im already loosing it with this machine. You can find specs here It says 'technishe daten' below the picture. Click that tab and you will reach the specs.

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  • Reset Windows share password after 'Remember forever'

    - by timmit
    I've been happily connecting to a Windows share from my 14.04 machine. When I first entered the password for the share I chose to have it remembered forever. Yesterday I changed the password on the Windows machine, today I can't access the share... My searches for a solution have been in vain, most suggestions say that there is an entry in the Password & Keys (seahorse) app that should be deleted, this doesn't exist for me. I even ran seahorse as the root user to see if the key was hidden away in there, but no luck. Is there anywhere else I should be looking? Shouldn't the Nautilus app be prompting me to update my password in this scenario?

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  • Replace Android on HP Slate 21?

    - by user288626
    I want to replace Android with Ubuntu for Androids on my new HP Slate 21. As far as I known none has ever tried it yet and I would appreciate if Ask Ubuntu would help out here. Would I need to unlock & root first my machine? (In which case I will need a second machine plugged to my Slate...) Or can I just insert the bootable usb with the distribution I need and go from there as in a normal non-optical drive situation? Also where can I find the downloadable file/image of Ubuntu for Android as describe here? I see no link with the name on it.. Should I just download the normal dis and choose from options when installing it?

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  • Why is Java the lingua franca at so many institutions?

    - by Billy ONeal
    EDIT: This question at first seems to be bashing Java, and I guess at this point it is a bit. However, the bigger point I am trying to make is why any one single language is chosen as the one end all be all solution to all problems. Java happens to be the one that's used so that's the one I had to beat on here, but I'm not intentionality ripping Java a new one :) I don't like Java in most academic settings. I'm not saying the language itself is bad -- it has several extremely desirable aspects, most importantly the ability to run without recompilation on most any platform. Nothing wrong with using the language for Your Next App ^TM. (Not something I would personally do, but that's more because I have less experience with it, rather than it's design being poor) I think it is a waste that high level CS courses are taught using Java as a language. Too many of my co-students cannot program worth a damn, because they don't know how to work in a non-garbage-collected world. They don't fundamentally understand the machines they are programming for. When someone can work outside of a garbage collected world, they can work inside of one, but not vice versa. GC is a tool, not a crutch. But the way it is used to teach computer science students is a as a crutch. Computer science should not teach an entire suite of courses tailored to a single language. Students leave with the idea that all good design is idiomatic Java design, and that Object Oriented Design is the ONE TRUE WAY THAT IS THE ONLY WAY THINGS CAN BE DONE. Other languages, at least one of them not being a garbage collected language, should be used in teaching, in order to give the graduate a better understanding of the machines. It is an embarrassment that somebody with a PHD in CS from a respected institution cannot program their way out of a paper bag. What's worse, is that when I talk to those CS professors who actually do understand how things operate, they share feelings like this, that we're doing a disservice to our students by doing everything in Java. (Note that the above would be the same if I replaced it with any other language, generally using a single language is the problem, not Java itself) In total, I feel I can no longer respect any kind of degree at all -- when I can't see those around me able to program their way out of fizzbuzz problems. Why/how did it get to be this way?

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  • Sysprep a BizTalk Server VHD

    - by AbhishekLohani
    Hi All,   Sysprep creates a snapshot of a virtual machine with BizTalk Server 2010 installed for quick deployment on other virtual machines   Prerequisites Before using Sysprep, you should have some knowledge of using virtual machines with Hyper-V. You should also have a virtual machine with a clean, typical installation of BizTalk Server and all of its prerequisites. Sysprep will run on Windows Server 2008 and Windows Vista with SP1. Description Sysprep creates a VHD of a BizTalk Server 2010 installation (including the operating system and all prerequisites) for quick deployment on other virtual machines. An image created using Sysprep will choose a new computer name in order to join the domain the first time it starts. To get BizTalk Server running properly, it is necessary to update various instances of the computer name that are stored in the registry and databases. Please refer the Microsoft Links for Details :http://technet.microsoft.com/en-us/library/ee358636.aspx   Thanks Abhishek

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