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• How Does The Maybe Monad Relate To The Option Type?

  - by Onorio Catenacci

  I was doing a presentation on F# and was discussing the Option type when someone in the audience asked me if the Option type is F#'s implementation of the maybe monad. I know that's not the case but I did want to ask how the two concepts are related. I mean it seems to me that an option type might be the result of the operation of a maybe monad but I'm not even sure of that. Would someone elucidate the relationship between the maybe monad and the option type in those functional languages which support it?

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• After the update today no graphical interface anymore - 12.04

  - by Mark

  I installed the updates through the update manager today. I shut down my Laptop and now after starting it up again, I only get terminal access to advices. Grub is loading fine and after I picked Ubuntu 12.04 the screen get blank and I am asked to log in with my username and password in command line mode. If I log in I am still in command line mode. How do I get the "normal (graphical)" Ubuntu back? I hope you know what I mean. Since English is not my first language I can't explain this the way I would like to. Mark

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• Know Thy Operating System?

  - by AdityaGameProgrammer

  As developers how much time, or do you spend time, In learning the hidden features tricks of your operating system ? How important do you feel is this for productivity in day to day programming? tasks. What do you mean when you list knowledge of an OS in your resume? What are your favorite hidden -less known features For example: A common problem of How can i open the cmd window in a specific location a do it yourself solution in say xp and what to do if something breaks Are these something you look into as and when you find the need to do so?

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• What is a Histogram, and How Can I Use it to Improve My Photos?

  - by Eric Z Goodnight

  What’s with that weird graph with all the peaks and valleys? You’ve seen it when you open Photoshop or go to edit a camera raw file. But what is that weird thing called a histogram, and what does it mean? The histogram is one of the most important and powerful tools for the digital imagemaker. And with a few moments reading, you’ll understand a few simple rules can make you a much more powerful image editor, as well as helping you shoot better photographs in the first place. So what are you waiting for? Read on!  What is a Histogram, and How Can I Use it to Improve My Photos?How To Easily Access Your Home Network From Anywhere With DDNSHow To Recover After Your Email Password Is Compromised

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• Why do I have to reconnect my usb router cable?

  - by Searock

  I have a Iball Baton ADSD2+ Router. It's working fine but the problem is when I boot into Ubuntu I have to unplug the usb cable and then plug it again, then it starts working. Why do I have to re connect my usb cable? Let me know if you need more details. Edit : I am using a direct connection. I mean to say I don't have to enter a username or password. I am connected to internet as soon as I start my router. The problem is if I start my router before my computer I have to re connect my usb cable. Thanks.

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• SQL Server 2012 Service Pack 1 is available!

  - by AaronBertrand

  Microsoft has released Service Pack 1 for SQL Server 2012. Though so far it is only being made available for the x64 platform. You can read about the fixes in the following KB article: http://support.microsoft.com/kb/20120401 The build # appears to be the same as RTM: 11.0.2100. Which may mean it's just a ploy to bring on board all those folks who still think it's necessary to wait for SP1. I haven't tried installing it yet, as I'm still on travel, but please let me know if you have any issues....(read more)

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• Are the famous websites handmade? [closed]

  - by Mithun Chuckraverthy

  I'm a newbie in web designing. I always wanted to build a professional quality website by myself. So, I started learning HTML/XHTML and CSS for presentation; and, JavaScript and PHP/MySQL for scripting. I wonder, would the developers of famous websites design them by hand? Or, have they found out any better idea of using softwares? If so, can you tell me what are they? (By the word famous, I mean any websites that are liked by millions of people all over the world. Like: Google, Facebook etc.) Thanks in advance!

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• How can i install XFCE along side unity?

  - by James

  I would like to be able to install XFCE to run alongside unity so I can choose on startup which DE I use, without breaking any features of either DE. Following this: https://sites.google.com/site/easylinuxtipsproject/xubuntu "Note: don't install Nautilus in Xubuntu! This will cause system conflicts." I don't want to affect ANY of the features in unity, i.e. I want to be able to use the two interchangeably, so I can't follow some suggestions of just cleaning out all the old stuff as that would mean using unity would be changed, (http://askubuntu.com/questions/111400/can-i-install-unity-aside-with-xfce-and-switch-them-as-i-want) is this possible in 12.04? [System] ubuntu 12.04.1 64bit.

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• DIY HDTV Antenna Sticks To Your Window without Blocking the View

  - by Jason Fitzpatrick

  This DIY fractal-based HDTV antenna is cheap, easy to craft, and can be stuck unobtrusively on your window for better signal gains. Courtesy of HTPC-DIY, this simple build uses aluminum foil, a printed fractal pattern, clear plastic, and some basic hardware to create a lightweight and transparent antenna you can affix to a window without significantly blocking light from entering the window. Hit up the link below for the full build details as well as designs for other DIY antennas. DIY Flexible Fractal Window HDTV Antenna [via Hack A Day] HTG Explains: What Is Windows RT and What Does It Mean To Me? HTG Explains: How Windows 8′s Secure Boot Feature Works & What It Means for Linux Hack Your Kindle for Easy Font Customization

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• "A", "an", and "the" in method and function names: What's your take?

  - by Mike Spross

  I'm sure many of us have seen method names like this at one point or another: UploadTheFileToTheServerPlease CreateATemporaryFile WriteTheRecordToTheDatabase ResetTheSystemClock That is, method names that are also grammatically-correct English sentences, and include extra words purely to make them read like prose. Personally, I'm not a huge fan of such "literal" method names, and prefer to be succint, while still being as clear as possible. To me, words like "a", "an", and "the" just look plain awkward in method names, and it makes method names needlessly long without really adding anything useful. I would prefer the following method names for the previous examples: UploadFileToServer CreateTemporaryFile WriteOutRecord ResetSystemClock In my experience, this is far more common than the other approach of writing out the lengthier names, but I have seen both styles and was curious to see what other people's thoughts were on these two approaches. So, are you in the "method names that read like prose" camp or the "method names that say what I mean but read out loud like a bad foreign-language-to-English translation" camp?

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• What do you use to organize your team knowledge?

  - by Stefano Verna

  Last year, me and three good old friends of mine founded a small web/mobile development team. Things are going pretty well. We're learning a lot, and new people are joining the group. Keeping knowledge always updated and in-sync is vital for us. Long emails threads are simply not the way to go for us: too dispersing and confusing, and hard to retrieve after a while. How your team manages and organizes common knowledge? How do you collect and share useful resources (articles, links, libraries, etc) inside your team? Update: Thanks for the feedback. More than using a wiki to share team common procedures or informations, I'd like to share external links, articles, code libraries, and be able to comment them easily within my team. I was particularly interested in knowing if you're aware of any way/webservice to share a reading list with a team. I mean, something like Readitlater/Instapaper, but for teams, maybe with some stats available, like "# of coworkers who read it".

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• What's the current best practice for C multithreading?

  - by Dexter

  I've been a Java (and PHP) developer for most of my life, but will need to use C for my next project. I remember some basic stuff we did back in school with fork, pthread, semaphores, etc. but I'm not sure if that's still the "way to go" here, or if there have been any recent developments/improvements etc. Google's results seem to be fairly dated. Or does that just mean that this is still the current "state of the art"? Or will I have to use a (system-independent) libary like glib if I want higher-level abstractions, like synchronized queues? What other libraries are there? (The programm will only have to run on Linux though)

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• Best keyboard to use with RollerMouse

  - by jrdioko

  I recently purchased a RollerMouse, which seems like an excellent way to eliminate pain caused by mousing. My question is: what good keyboard can other programmers recommend that would work well with it. I currently have a Microsoft ergonomic keyboard, but the curve and large wrist rest make it hard to use with the RollerMouse. By "good", I mean: Works with the RollerMouse (no wrist rest) Ergonomic (a slight curve or other features designed to be easy on your wrists/arms) Good for programming (that would be its primary use, no need for fancy media buttons or anything like that) Suggestions?

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• What zoomable image viewers are there for websites?

  - by tog22

  What zoomable image viewers are there? By these I mean tools that one can embed in a website to let a user zoom in on and pan around a high res image, a canonical example being http://www.zoomify.com/ (see the demo on their home page). Comments on them are welcome. I'm personally looking for something simple and cheap/free which ideally doesn't require Flash, and will accept the answer that comes closest to these requirements. But others who find this question may have different requirements, so all suggestions will be helpful. I have of course searched; I've found Zoomify, http://www.openzoom.org/ and http://code.google.com/p/galapix/ but none seem to meet my requirements, though I could be wrong and others may have more expert comments on these.

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• SEO: disallowing Google from indexing forms in iframes or not?

  - by Marco Demaio

  I usually place forms in iframes (i.e. order form, request assistance form, contact forms, ect.). Just the forms, I never place other contents or pages in iframes. From a SEO point of view, would you exclude forms from being indexed/crawled by Google or not? I mean my forms hardly ever contains keyword/keyphrases, moreover I obviously place empty title/meta description tags in pages shown in iframe to display forms, cause those titles are never displaied in browser title bar. So I'm wondering what's the point of letting Google index them? Moreover I think these form pages might suck out PR from all other pages that are more valuable for SEO. If your answer is "yes I would exclude them form indexing" would you simply use robots.txt to exclude them? Thanks!

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• Ubuntu appears very small at 1080p, text almost undreadable.

  - by Dakota

  Alright... So I have a 15" dell studio xps with a 1080p screen. Everything seems really small with 1080p, in 720 everything is fine but just looks very low res. So I definitely want to get the full resolution the display can give me but dont want everything so small. help?? EDIT: Well yes higher resolution means more pixels. But it shouldnt mean fonts the size of of 7 in MS word, and webpages looking like their at 50%... http://i.imgur.com/Ds76nk8.jpg http://i.imgur.com/9fW8vEt.jpg Im not saying windows is better, but windows did not appear miniature at 1080.

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• Is it possible to save output from a command to a file after the command already has been executed?

  - by NES

  Does an elegant way exist to save the output of a command to a file after the command has been run, with the terminal window is open? I mean once the command has been executed in the terminal. The output is still there in terminal. Now i could copy & paste all the lines and save it to a file. But perhaps does a method exist to somehow write the output buffer of a terminal window to a file or even better the output of an already executed command?

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• Can I require a large donation ($499) in order for a company to receive an extended version of my open source project? [closed]

  - by Damian

  I want to make my project open source but some of its more advanced features are targeted to companies so I would like to require a donation before I send the source code to the donating company. It will be something like that: "If you want to use the extended features of XXXXXXX, please make a donation of $499 and you will receive the source code and the jar with the extended features. You will also receive personalized support by email." Is it legal and acceptable to do something like that? Can the companies donate an amount like that to an open source project? I mean, is it easy for them in terms of their accounting, tax, etc. to donate $499 dollars to an open source project. I know it is not a matter whether they will have money or not but more of a paying procedure matter.

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• dhcp configuration not working ubuntu 11.10

  - by Vivek Pradhan

  I am usually behind a proxy server in college so I connect to the ethernet or wifi using manual IPv4 addresses only inside college. I have been trying really hard to get the internet work at home, there is no proxy and I have set the network to use automatic dhcp. It seems like it is not able to connect to the port, It gets disconnected after some time automatically and then tries to reconnect. The same thing is happening with wifi networks also, after some time i see a pop up asking for authentication and ultimately its not able to connect. What might be the problem here. I looked up some similar questions and checked the /etc/network/interfaces file and looks like this: auto lo iface lo inet loopback I have no idea what those lines mean but there is no configuration for eth0 or wlan0. Any help is deeply appreciated. Ubuntu loses it charms due to these small glitches.

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• Install Opera on 64-bit

  - by maaartinus

  I tried to follow the instructions on the opera page, but it didn't work. I was assuming the base install should be the same for 64-bit, but it doesn't look so. After executing wget -qO - http://deb.opera.com/archive.key | sudo apt-key add - successfully sudo apt-get install opera says Reading package lists... Done Building dependency tree Reading state information... Done Package opera is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'opera' has no installation candidate Below on the page I see A 64 bit Linux version is available, you should get it automatically either from the repositories or from Opera I haven't tried to download it manually, since I prefer to get it from a repo. It it possible?

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• Why does my RAID configuration with mdadm fail on reboots?

  - by Andy B

  I have been running Ubuntu server on my machine for 2 years and it has worked ok. I would like to speed it up by raiding a few drives. The machine is used to host my Mysql databases internally. using MDADM raid.. I have tried 2 schemes so far with the 3 drives. 2 partitions on each drive 1 for the swap 1 for the O/S both of them turned into drives raid level 5 3 partitions on each drive 1 for the boot 1 for the swap and 1 for the root. The boot I set to raid level1 and the swap and root raid drives were set to level5 Both setup worked fine for about a week, then on a reboot things fall apart. by fall apart I mean I end up with a bunch of hard drive errors on the screen and then get a grub prompt. Why do they fail on reboots? I am eager to understand what I am doing wrong thanks!

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• After installing ubuntu 12.04 my internet connection has completely disappeared

  - by Tony

  On my PC after installing Ubuntu 12.04 my networks are completely gone. Inside the terminal, after typing in nm-tool I get the following: The program nm-tool is currently not installed. You can install by typing: sudo apt-get install network-manager After I type that in then my password I get this: Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: network manager : Depends: iputils-arping but it is not going to be installed E: Unable to correct problems, you have held broken packages I'm a complete novice when it comes to computers so I have no clue.

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• Scrolling Box2D DebugDraw

  - by onedayitwillmake

  I'm developing a game using Box2D (javascript implementation - Box2DWeb), and I would like to know how I can pan the debug draw. I know the usual answer is - don't use debug draw, it's just for debugging. I'm not, however not all my objects are on the same screen, and i'd like to see where they are in the physics representation. How can I pan the debug drawing? As you can see the debug draw stuff, is show on the top left, but it only shows a small part of the world. Here is an example of what I mean: http://onedayitwillmake.com/ChuClone/ The game is open source, If you'd like to poke through and note something that perhaps i'm doing something that is obviously wrong: https://github.com/onedayitwillmake/ChuClone

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• Techniques for Working Without a Debugger [closed]

  - by ashes999

  Possible Duplicate: How to effectively do manual debugging? Programming in a debugger is ideal. When I say a debugger, I mean something that will allow you to: Pause execution in the middle of some code (like a VM) Inspect variable values Optionally set variable values and call methods Unfortunately, we're not always blessed to work in environments that have debuggers. This can be for reasons such as: Debugger is too too too slow (Flash circa Flash 8) Interpreted language (Ruby, PHP) Scripting language (eg. inside RPG Maker XP) My question is, what is an effective way to debug without a debugger? The old method of "interleave code with print statements" is time-consuming and not sufficient.

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• Why make the login page to a single page application a separate page?

  - by ryanzec

  I am wondering why it seems to be popular to have the login page of a SPA be a separate page that is not page of the SPA (as in loaded and send data through ajax requests)? I only thing I can think of is security but I can't think a specific security reason. I mean the only thing that come to mind is that if your login page in part of the SPA, it sends the username/password through ajax which can be seen by such tools like firebug or web inspector however even if you send it as a normal POST request, there are other tools that can easily capture this data (like fiddler, httpscoop, etc...). Is there something I am missing?

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