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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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• 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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• Basic Ubuntu FTP Server

  - by JPrescottSanders

  I would like to setup a basic FTP server on my Ubuntu Server install. I have been playing with VSFTPD, but am having issues getting the server to allow me to create directories and copy files. I have set the system to allow local users, but it appears that doesn't mean I get access to create directories. This may be an instance where I need to be better grounded in Unbuntu server setup in order to configure this FTP server adequately. The end goal is to be able to move files from my local dev folder into my www folder for deployment. Directories need to be able to move as well. Any help would be greatly appreciated.

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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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• Does SEO optimisation count on the responsive side of a site?

  - by Rick Donohoe

  I'm looking at making some SEO optimisation fixes, and at this point I'm sorting out the heading structure and keywords - H1's, H2's etc We have a site where there are a number of similar blocks, and one is always visible, and one is hidden depending on the screen size. This is our method of making a single site responsive. Firstly, how does this technique affect the SEO, and in general does the responsive side of a site matter at all to search engines? What I mean by this is if the site has different content depending on screen sizes, then which content would the search spider crawl?

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• Can't install php5 on Ubuntu

  - by Itay Moav

  I try to apt-get install php5 I get: 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: php5: Depends: libapache2-mod-php5 (>= 5.3.99+5.4.0-1~842.gbp76989e) but it is not going to be installed or libapache2-mod-php5filter (>= 5.3.99+5.4.0-1~842.gbp76989e) but it is not going to be installed or php5-cgi (>= 5.3.99+5.4.0-1~842.gbp76989e) but it is not going to be installed or php5-fpm (>= 5.3.99+5.4.0-1~842.gbp76989e) but it is not going to be installed I am on ubuntu 10.4 Do not wish to upgrade to the one that has the Unity UI.

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• Triple buffering causes input lag?

  - by user782220

  Consider some time in between two vsyncs. Suppose the first display buffer is being used to display the current image, and suppose the game was really fast and computed and rendered the next image to the second display buffer and the next one after that to the third display buffer. That is the rendering to the second and third display buffer happens so fast that it occurs before the next vsync. Suppose input from the user comes in now. What you would like is for the results of the input to show up on the next vsync or (probably more typical) the vsync after that. However, with the third display buffer already rendered the input can only effect the image after that. Meaning the input will only take effect at best 3 vsyncs later. I wish i had an image to show the exact timings of what I mean.

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• Doing Master'S at Home.

  - by Demla Pawan

  I mean,as I'm a computer science student at present,soon I'm going to get job at somewhere,But I wish to go for higher studies in MS,My interests are automation of things using web app's, and I wish to research in AI,as I think it may resolve most of ours present problem's. So,I'm thinking of, is there anyway to do MS like studies and research in organised manner at home only, as a part-time research work,bcoz I like learn new things anytime. So,Finally can you tell me what's the pattern of MS studies and which MS field suits me, as I'm interested in web and Mobility solution like mobiles. and along with that is there a correspondence MS possible,from where.

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• Sending state diffs (deltas) and unreliable connections

  - by spaceOwl

  We're building a realtime multiplayer game, in which each player is responsible for reporting its state on every iteration of the game loop. The state updates are broadcasted using unreliable UDP. To minimize state data sending, we've come up with a system that will send only deltas (whatever state data that was changed). This method however is flawed, since a lost packet will mean that other players will not receive the delta, making the game behave in an unexpected way. For example: Assume that state is comprised of: { positionX, positionY, health } Frame 1 - positionX changed --> send a packet with positionX only. Frame 2 - health changed // lost ! Frame 3 - positionY changed --> send a packet with positionY only. // Other players don't know about health change. How can one overcome this issue then? sending the entire data is not always feasible.

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• Flowchart for solving programming problems

  - by nurne

  I noticed that every developer implements a somewhat different flowchart for solving programming problems. By flowchart I mean a defined system of techniques that the developer goes through in a certain sequence, trying to solve the problem at hand. Some examples for techniques: Google "how to..." or "... tutorial". Search the java/msdn/apple/etc API doc for the specific class or method. Search in stack overflow the exact problem with some tags like [iphone]/[java] etc. Take a nap and let the subconscious work. Debug. Draw the algorithm or system. Google the logged error message. Ask a colleague or manager. Ask a new question in stack overflow. From your experience, what is the best flowchart for solving a programming problem?

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• What features would you like to have in PHP? [closed]

  - by StasM

  Since it's the holiday season now and everybody's making wishes, I wonder - which language features you would wish PHP would have added? I am interested in some practical suggestions/wishes for the language. By practical I mean: Something that can be practically done (not: "I wish PHP would guess what my code means and fix bugs for me" or "I wish any code would execute under 5ms") Something that doesn't require changing PHP into another language (not: "I wish they'd drop $ signs and use space instead of braces" or "I wish PHP were compiled, statically typed and had # in it's name") Something that would not require breaking all the existing code (not: "Let's rename 500 functions and change parameter order for them") Something that does change the language or some interesting aspect of it (not: "I wish there was extension to support for XYZ protocol" or "I wish bug #12345 were finally fixed") Something that is more than a rant (not: "I wish PHP wouldn't suck so badly") Anybody has any good wishes? Mod edit: Stanislav Malyshev is a core PHP developer.

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• *Hidden Features* in your operating system that increase productivity?

  - 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 most useful 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 Or are these something you look into as and when you find the need to do so?

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• Dimming the backlight is irreversible on a Samsung Q210 notebook, what do I do?

  - by user27304

  I'm new to the community, although I have been using Ubuntu since 2010. I have a Samsung Q210 notebook; Specs: Intel® Core™2 Duo CPU P8400 @ 2.26GHz × 2 4 Gigs RAM Nvidia 9200m GS (although system information in Ubuntu doesn't know) 194 GB HD OS: Ubuntu 11.10 Kernel is 3.0.0-12-generic-pae Although Samsung seems to be infamous for problems with Ubuntu, after upgrading to Oneiric, finally the FN Brightness Buttons are recognized. The only problem is, after dimming the backlight for a fixed amount of steps (3 or 4, I dare not count now because that would mean rebooting because I can't see anything), the display goes completely dark and using the FN buttons to brighten the backlight does not work anymore (before reaching that threshold, going brighter after dimming works). Now what do I do? File a bug report? If not, what then? If yes, how? Not sure... guess I should ask here first.. thanks for answering in advance.

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• Use Google Analytics to record newsletter clicks to an external website

  - by rlsaj

  Note: by external website I mean a website that we do not have access to the code. For example www.facebook.com I want to record how many social share clicks we have from our customer newsletters. For example, when a customer receives a newsletter they can click "Share this on Facebook" which shares the hosted version of the newsletter. If I wanted to record these newsletter clicks to our website I understand we'd use Google URL Builder (https://support.google.com/analytics/answer/1033867?hl=en) to create a UTM URL but because we're linking to an external site, how do we record this?

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• Movie Poster Colors Over Time

  - by Jason Fitzpatrick

  This spectrograph-like image records tens of thousands of movie posters over the course of a century, showing a steady shift towards posters that emphasize black, purple, and blue color tones. It’s a neat look at how the color tastes of an entire industry shift over time. Vijay Pandurangan had a disagreement with a friend about whether or not movie posters were becoming darker/bluer over time. Rather than simply agree to disagree, he whipped up a piece of code that downloaded and analyzed thousands of movie posters proving that, in fact, there was a slow and steady shift towards darker and bluer posters. Hit up the link below to see the interactive version (and larger!) version of his infographic as well as his explanation of the process and the source code. Colours In Movie Posters Since 1914 [via Flowing Data] 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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• Is there a point to writing in C or C++ instead of C# without knowing specifically what would make a program faster?

  - by user828584

  I wrote a small library in Python for handling the xbox 360's STFS files to be used on my web applications. I would like to rewrite it for use in the many desktop programs people are writing for 360 game modding, but I'm not quite if I should continue using C# or delve into C++ or even C. STFS is an in-file file system used by the xbox 360 and the job of the library would be extracting/injecting files, which could take noticeable amounts of time to do. What I know in C# comes from internet tutorials and resources, as would anything I learn about C++, so what I'm asking is if it's better to bring myself to a slightly lower-level language without knowing beforehand the features of the language that increase performance, or continue assuming that compiler optimizations and that my lack of experience will mean that the language I choose won't matter.

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• Correct way to sell commercial product with GPL small scripts in it

  - by Victor

  I'm developing a commercial cms. I'm going to sell this cms. I use jQuery, also I use date and time picker jQuery plugin in my cms, I can say this is just a 1% of my big script, I don't want sell my whole program as GPL because of these two small integrations (jQuery and DateTime picker). Please ask on these questions: I'm worry about license issue. What is the best way to sell my product(licensing type)? Is there any way to provide some partial licenses? I mean just add small notification in my license that the jQuery and The DateTime picker is still in GPL, but other part of this CMS has commercial license? If there isn't any way to sell commercial product as close source with GPL small parts, what is the most strong license for selling my product to keep it safe? Please sorry for my English

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• Tornado Tracks Highlights 61 Years of Tornado Activity [Wallpaper]

  - by Jason Fitzpatrick

  This eye catching image maps 61 years worth of storm data over the continental United States. It’s neat way to see the frequency and intensity of tornadoes and is available in wallpaper-friendly resolutions. John Nelson took 61 years of data from government sources like the NOAA and compiled the data into a visualization. You can read more about the methodology behind the image at the link below or jump right to Flickr to grab a high-res image for your desktop. Tornado Tracks [via Neatorama] How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It? HTG Explains: What Is Windows RT and What Does It Mean To Me?

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• Why would a web site keep my signup information for a limited time only?

  - by Alois Mahdal

  I have just created account at (some web service, well, actually it was Transifex, a localization service). Registration form requested typical things: accont name, e-mail adress, password (twice), and, optional company name and phone number. What confused me was this sentence on confirmation page (the one right after submitting the form): We will store your signup information for 7 days on our server. Can anybody explain what does this mean? What exactly they are referring to by "signup information", if it's something that should be kept for only 7 days? Or is my account going to be destroyed after that time? (Well, that could make sense for some special services, but not for this one.)

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• How do I access and enable more icons to be in the system tray?

  - by Jon

  So I'm messing around with Natty a little, and I noticed that all the apps that would normally use the system tray (or "notification area"?) aren't displaying there. Is that a bug, or is that the way it's going to be? I heard something about Ubuntu getting rid of that feature entirely. Is there a way to add it back? I mean, I didn't really like it, either, especially when there were apps that used it unnecessarily, but I can't use CryptKeeper at all now, or easycrypt, and I don't know whether Dropbox has synced without opening Nautilus.

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• World of Warcraft like C++/C# server (highload)

  - by Edward83

  I know it is very big topic and maybe my question is very beaten, but I'm interesting of basics how to write highload server for UDP/TCP client-server communications in MMO-like game on C++/C#? I mean what logic of retrieving hundreds and thousands packages at the same time and sending updates to clients? Please advice me with architecture solutions, your experience, ready-to-use libraries. Maybe you know some interesting details how WoW servers work. Thank you! Edit: my question is about developing, not hardware/software tools;

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• Cinnamon install problem ubuntu 12.04

  - by Kin.

  I was following the How do I install the Cinnamon Desktop?, but when i install, it like this locahost@locahost:~$ sudo apt-get install cinnamon 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: cinnamon : Depends: libgjs0- E: Unable to correct problems, you have held broken packages. How can i install the libgjs0- package?

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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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• The State of the Internet -- Retail Edition

  - by David Dorf

  Over at Business Insider, there's a great presentation on the State of the Internet done in the Mary Meeker style.  Its 138 slides so I took the liberty of condensing it down to the 15 slides that directly apply to the retail industry.  However, I strongly recommend looking at the entire deck when you have time.  And while you're at it, Business Insider just launched a retail portal that's dedicated to retail industry content.  Please check it out as well.  My take-aways are below after the slide show. &amp;amp;amp;amp;lt;span id=&amp;amp;amp;amp;quot;XinhaEditingPostion&amp;amp;amp;amp;quot;&amp;amp;amp;amp;gt;&amp;amp;amp;amp;lt;/span&amp;amp;amp;amp;gt; [Source: Business Insider] Here are a few things I took away from the statistics: Facebook and Twitter are in their infancy.  While all retailers should have social programs, search is still the driver and therefore should receive the lions share of investment.  Facebook referrals are up 92% year-over-year, but Google still does 80% of the referrals. E-commerce continues to grow at breakneck speed, but in-store commerce is still king. Stores are not showrooms yet.  And social commerce pure-plays like Gilt and Groupon are tiny but worthy of some attention. There are more smartphones than PCs on the internet, and the disparity will continue to grow. PC growth will be flat and Tablet use will continue to grow. Mobile accounts for 12% of all internet traffic. A quarter of smartphone sales come from China, so anyone with a presence there better have a strong mobile strategy. 38% of people have used their smartphone to make a purchase, and many use their smartphones inside stores.  Smartphones are a critical consumer tool for shopping. Mobile is starting to drive significant traffic to e-commerce sites, especially tablets.  Tablet strategies are crucial for retailers. Mobile payments from the likes of Paypal and Square are growing quickly.  It will be interesting to see how NFC plays in this area. Mobile operating systems are losing market share to iOS and Android.  I wonder in Microsoft can finally make a dent? The internet is being dominated by mobile devices, and retailers had better have a strong mobile strategy to meet consumer demand.

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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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