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• What is the formal definition of a meta package?

  - by kojiro

  There are several examples of packaging where an application package is built, named, described, even licensed, but contains only setup code and dependencies -- it has no first-class runtime software of its own. I would call this "meta-packaging". This seems to be particularly popular in the open-source world, including examples like kde-meta (Gentoo Portage), Plone, and I'm sure lots of others. I can see how it's a useful practice, but despite it existing as a practice, I couldn't find a formal definition of either "meta-packaging" or "meta-egg" (Python) in searching the web. Is that not the correct term? If it is, is it such common-sense that it needs no formal definition? If not, what is the correct way to put it?

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• why the next button doesn't work in Joomla! 2.5.4 Installation [closed]

  - by rahul

  I was trying to insall the Joomla! 2.5.4 Installation. But I got stucked in the first step only. The button doesn't respond on clicks. I tried previous version like 1.5.26. But here also the process got hang after the 3rd step. In the 4th step the next button doesn't work as before. what to do, I am in dilemma. I am using XAMPP server for my localhost,please guide me, I lost complete one day in installing Joomla.

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• How to design a game engine in an object-oriented language?

  - by chuzzum

  Whenever I try and write a game in any object-oriented language, the first problem I always face (after thinking about what kind of game to write) is how to design the engine. Even if I'm using existing libraries or frameworks like SDL, I still find myself having to make certain decisions for every game, like whether to use a state machine to manage menus, what kind of class to use for resource loading, etc. What is a good design and how would it be implemented? What are some tradeoffs that have to be made and their pros/cons?

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• what is the purpose of arrows?

  - by Simon

  I am learning functionnal programming with Haskell, and I try to grab concepts by first understanding why do I need them. I would like to know the goal of arrows in functional programming languages. What problem do they solve? I checked http://en.wikibooks.org/wiki/Haskell/Understanding_arrows and http://www.cse.chalmers.se/~rjmh/afp-arrows.pdf. All I understand is that they are used to describe graphs for computations, and that they allow easier point free style coding. The article assume that point free style is generally easier to understand and to write. This seems quite subjective to me. In another article (http://en.wikibooks.org/wiki/Haskell/StephensArrowTutorial#Hangman:_Main_program), a hangman game is implemented, but I cannot see how arrows makes this implementation natural. I could find a lot of papers describing the concept, but nothing about the motivation. What I am missing?

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• How can I have my VPN connect automatically when the wireless connects?

  - by ams

  I have a working VPN connection using NetworkManager, OpenConnect, and the network-manager-openconnect-gnome package, but I have to start it manually every time I connect to a network, and I have to enter my password manually each time. How can I get it to connect automatically, and remember my password (securely)? I have checked the 'Connect Automatically' box on the Configure VPN page, but this seems to have no effect. I've also got the 'Start connecting automatically' box checked in the pop-up box, and that does avoid the need to press the connect button in that window, but seems to have no part in kicking off the whole process in the first place. There is no option to remember the password in the window, but maybe there's one somewhere else?

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• Some help understanding and modifying a 2D shader

  - by electroflame

  I have a similar question as the one posed here, except that I don't wish to use a 1D Color Palette. I simply wish to have it display 1 color of my choosing (red, for example). I plan to use this as a "shield" effect for a 2D ship. I also wish to understand how it works a little bit better, as I'll be the first to admit that shaders in general are not my strongest suit. I'm not asking for an overview of HLSL (as that is too broad of a subject), just an explanation of how this shader works, and the best way to implement it in a 2D game. Code examples would be ideal (even if they are theoretical) but if the answer is explained well enough, I might be able to manage with plain old text. This is also in XNA 4.0. Thanks in advance.

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• Building a Debian package with two buildsystem

  - by queueoverflow

  I have a package that needs to be build with both a regular makefile and a setup.py. The thing is that the Debian packaging magic that is invoked via debuild would recognize a makefile and do the right make make install DESTDIR=??? thing and get it working right. When I only have a setup.py sitting there and have dh $@ --with python3 --buildsystem pybuild in debian/rules, it will correctly install the Python module with python3 setup.py build python3 setup.py install --install-layout deb --root=??? ??? I do not know all those flags. And I think that I do not need to. I just want the makefile magic to happen, and then the setup.py magic. How can I tell debuild to do both? When I do the following in debian/rules %: dh $@ dh $@ --with python3 --buildsystem pybuild it will only put the first one into the resulting package. I tried to delete the debhelper.log between those, but that did not change much.

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• Configuring Network without Default Gateway

  - by Homayoon

  I'm trying to connect my desktop and laptop using an ethernet connection. I usually configure network from the command line but this time I decided to give Network Manager a try, so I went to Network Connections, and selected manual IP configuration. At first I left the default gateway field blank, since I don't need a default gateway. Turned out network manager doesn't let me save the connection unless I enter that field, but entering a phony gateway messes up with my Internet connection. Anyway to do this setup?

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• Number Game Algorithm

  - by 7Aces

  Problem Link - http://www.iarcs.org.in/inoi/2011/zco2011/zco2011-1b.php The task is to find the maximum score you can get in the game. Such problems, based on games, where you have to simulate, predict the result, or obtain the maximum possible score always seem to puzzle me. I can do it with recursion by considering two cases - first number picked or last number picked, each of which again branches into two states similarly, and so on... which finally can yield the max possible result. But it's a very time-inefficient approach, since time increases exponentially, due to the large test cases. What is the most pragmatic approach to the problem, and to such problems in general?

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• I want to fix a bug. Where do I start?

  - by Ingo Gerth

  Although I am not a professional programmer, I have written a program or two. Yet, nowadays every engineer and scientist learns to program a bit as well, and as such I am used to writing programs in Python, C and MATLAB. Now I want to give back a bit to Ubuntu and its great folks and fix a bug! I had a look at the list of the bitesize campaign and had to find that most of them are not that easy for me to fix as I suspect they require a lot of time to get into the matter, and I do not have that. Still I discovered this one and it looks manageable and like a cool feature to me. As I have never written a patch or released a program to the wild before though, I have no idea where to start. What should be my first step to tackle that problem? Bottom line: Where and how do I start fixing that guy?

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• Help with two mini-bugs

  - by oneuseaccount

  Let's see if someone can help me with two mini-bugs I have: Sometimes, when I close the laptop and later open it, the touchpad stops working properly. Most times it only acts fuzzy a few seconds and then starts working fine, but other times it stops working completely (I can't move the mouse arrow, althougt clicking buttons work fine) until I restart. Whenever I turn on the computer, some keys excange with others (" becomes @, ? becomes _, ¿ becomes +, etc), and I have to go to Keyboard input and add and delete some language (I use Afgan because it's the first) Thanks.

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• Importance of having EDU backlinks

  - by maisdesign

  I've built a few links on 50 EDU / GOV websites. 1 of them has PR 8, 3 of them have PR 7, 8 of them PR6,7 of them PR5,12 of them PR4,8 of them PR3, 1 of them PR2, 6 of them PR1, 10 of them PR0. My website has PR3 and is on first page of Google/Yahoo/Bing for a few keywords that I like How long will it take to notice a difference in PR or domain authority? (Don't tell me that PR has no value now, I know it but it is a 'fashion' thing). So you say that DOMAIN Authority isn't an important factor?

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• Gnome Shell opens as classic

  - by Joe Horgan

  I'm running 12.04 on a Gateway LT4004u netbook, and I installed Gnome3 using the apt-get commands in the terminal. When I rebooted and ran "Gnome Shell" it opened up classic mode. I thought that my cursor might have slipped the first time, but on multiple retries logging in under gnome shell would open the gnome classic desktop. I even uninstalled Gnome Shell and reinstalled it with software center, but I still have the same problem. I was wondering if this might be an issue with my graphics card? Any help would be much appreciated, thanks! -Joe

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• Does this factory method pattern example violate open-close?

  - by William

  In Head-First Design Patterns, they use a pizza shop example to demonstrate the factory method pattern. public abstract class PizzaStore { public Pizza orderPizza(String type) { Pizza pizza; pizza = createPizza(type); pizza.prepare(); pizza.bake(); pizza.cut(); pizza.box(); return pizza; } abstract Pizza createPizza(String type) } public class NYPizzaStore extends PizzaStore { Pizza createPizza(String item) { if (item.equals("cheese") { return new NYStyleCheesePizza(); } else if (item.equals("veggie")) { return new NYStyleVeggiePizza(); } else if (item.equals("clam")) { return new NYStyleClamPizza(); } else if (item.equals("pepperoni")) { return new NYStylePepperioniPizza(); } else return null; } } I don't understand how this pattern is not violating open-close. What if we require a beef Pizza, then we must edit the if statement in the NYPizzaStore class.

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• Flickering/Flashing screen problem related to keyboard

  - by LeandroCR

  This will seems quite bizarre but that's a huge problem for me, I'm facing it for a long time since Ubuntu 12.04. My Ubuntu/Linux Mint/Debian (Unity/Gnome) always starts flickering after using the computer for a while, I always thought this had something to do with the video board. I have an Vostro 3550 (Radeon 6xxx/Intel Onboard). First I realized that when I was navigating trough an website, when i selected with the mouse a combo, the combo closed it self automatically then the screen starts flickering. The i realized when i was trying to make the login in the terminal (crtl + alt + f1) a strange character appears, like: ^@ repeatedly. When i keep CRTL pressed the system never flickers! I have absolutely no problem using Windows. What can i do? There is no such thing as Keyboard driver on Dell Support. I would love to use Ubuntu only, but this is very annoying. Problem happens on Ubuntu 12.04, .10 and 13.04 Linux Mint 15 (Cinnamon) Debian Live with Gnome

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• Advice: should I focus on PHP + MySQL, or split my time for more JS and CSS? [closed]

  - by fakaff

  I started learning web development about three months ago (in between working my regular job), and I'm finally starting to get some vague, distant notion of understanding. I find the server-side stuff the most interesting; though I've not gone anywhere near Apache quite yet, which I assume will be necessary at some point. As cool as toying around with visuals and UI is, programming and database stuff inspires me with new ideas and possibilities every minute (I've even bought, on a whim, a wonderfully dry bunch of books on database theory and relational algebra). And whatever CSS or Javascript tutorial I'm doing, it often feels like a distraction from the PHP/MySQL stuff I'd rather be playing with. For someone like me who's just starting out, which is the most advisable course of action? (in terms of being marketable as a programmer): To focus on PHP and SQL stuff exclusively, and only once I master those to diversify my skills. To first learn all three (PHP/MySQL, Javascript, CSS and design) and only once I'm fluent in all three focus on PHP and databases?

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• What resources about business should an internal IT department programmer be familiar with

  - by Badger

  I am developer / analyst in an internal IT department at a medium sized business. I have to deal with business people all the time and many of the things I create can have profound impacts on the business. I am starting to regret not taking any business classes in college because I don't understand the first thing about running a business so I don't always understand what people are wanting, the best I can do is "think through it". Does anyone have suggested methods of learning this stuff, maybe some resources. And please don't just say to ask people who work here. I have tried that before and I get no where.

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• duplicate pages

  - by Mert

  I did a small coding mistake and google indexed my site wrongly. this is correct form: https://www.foo.com/urunler/171/TENGA-CUP-DOUBLE-HOLE but google index my site like this : https://www.foo.com/urunler/171/cart.aspx first I fixed the problem and made a site map and only correct link in it. now I checked webmaster tools and I see this; Total indexed 513 Not selected 544 Blocked by robots 0 so I think this can be caused by double indexes and they looks not selected makes my data not selected. I want to know how to fix this "https://www.foo.com/urunler/171/cart.aspx" links. should I fix in code or should I connect to google to reindex my site. If I should redirect wrong/duplicate links to correct ones, what the way should be? thanks for your time in advance.

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• Acquiring the Skill of SEO

  Many people might not be aware of the topic or what the article is in fact focusing upon. Basically the term referred in the above topic is related to internet tactics. It refers to search engine optimization which is a very well-known skill nowadays. Well moving on towards the definition, it is the process of improving the ranking of a particular website on a search engine. It is known as an internet market strategy in which first of all an analysis of working of search engines is carried out.

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• Ping one remote server from another remote server

  - by user666254

  It's simple to ping a server in C#, but suppose I have servers A, B and C. A connects to B. A asks B to ping C, to check that B can talk to C. A needs to read the outcome. Now, first of all is this possible without installing an application onto B? In other words, can I perform the entire check from just running a program on A? If so, can anyone suggest the route I would take to achieve this? I've looked at sockets but from the examples I've seen these require a client AND server application to function.

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• How can I print-screen just one window and not my entire desktop?

  - by Michael Durrant

  I could swear I've always been able to do alt-printscreen to get 'just that window' but right now I am getting my entire desktop. Any idea why this would be or what I can do to get my ability to do small window screen shots? I've tried a lot of combination with the ctrl, alt, shift and print-screen keys but no luck, nothing happens in response. One option: shift-ctrl print-screen lets me do a selection using a cross hair to size out the screen capture but I don't know where this gets saved. I'm not being given the choice and it's not in Desktop or Pictures. I use an external keyboard, but I've tried using the laptop's own keyboard and no difference. I am running Ubuntu 12.04 and the laptop is a Samsung Ultrabook 900 Update: I rebooted and it "fixed" it - for now. However this is not the first time I've seen this so I'm still curious as to why it happens, what I can do to fix w/o reboot and if other share the same problem.

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• nut (UPS) and SSL certificates

  - by Mausy5043

  Today I installed nut on my Ubuntu server (14.03). $ uname -a Linux boson 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux The UPS is connected to another server (called neutron), so I use nut-client to keep tabs on the UPS state. When I do sudo upsc [email protected] I get: Init SSL without certificate database battery.charge: 15 battery.charge.low: 10 battery.charge.warning: 50 battery.date: not set battery.mfr.date: 2012/11/27 : The first line of the output concerns me. I've not seen this on other installations of nut on Debian-based servers. What can I do to get rid of that line? EDIT: This "Init SSL without certificate database" is extra annoying because it is not part of the output of upsc and therefore I cannot grep it out.

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• How can I implement a database TableView like thing in C++?

  - by Industrial-antidepressant

  How can I implement a TableView like thing in C++? I want to emulating a tiny relation database like thing in C++. I have data tables, and I want to transform it somehow, so I need a TableView like class. I want filtering, sorting, freely add and remove items and transforming (ex. view as UPPERCASE and so on). The whole thing is inside a GUI application, so datatables and views are attached to a GUI (or HTML or something). So how can I identify an item in the view? How can I signal it when the table is changed? Is there some design pattern for this? Here is a simple table, and a simple data item: #include <string> #include <boost/multi_index_container.hpp> #include <boost/multi_index/member.hpp> #include <boost/multi_index/ordered_index.hpp> #include <boost/multi_index/random_access_index.hpp> using boost::multi_index_container; using namespace boost::multi_index; struct Data { Data() {} int id; std::string name; }; struct row{}; struct id{}; struct name{}; typedef boost::multi_index_container< Data, indexed_by< random_access<tag<row> >, ordered_unique<tag<id>, member<Data, int, &Data::id> >, ordered_unique<tag<name>, member<Data, std::string, &Data::name> > > > TDataTable; class DataTable { public: typedef Data item_type; typedef TDataTable::value_type value_type; typedef TDataTable::const_reference const_reference; typedef TDataTable::index<row>::type TRowIndex; typedef TDataTable::index<id>::type TIdIndex; typedef TDataTable::index<name>::type TNameIndex; typedef TRowIndex::iterator iterator; DataTable() : row_index(rule_table.get<row>()), id_index(rule_table.get<id>()), name_index(rule_table.get<name>()), row_index_writeable(rule_table.get<row>()) { } TDataTable::const_reference operator[](TDataTable::size_type n) const { return rule_table[n]; } std::pair<iterator,bool> push_back(const value_type& x) { return row_index_writeable.push_back(x); } iterator erase(iterator position) { return row_index_writeable.erase(position); } bool replace(iterator position,const value_type& x) { return row_index_writeable.replace(position, x); } template<typename InputIterator> void rearrange(InputIterator first) { return row_index_writeable.rearrange(first); } void print_table() const; unsigned size() const { return row_index.size(); } TDataTable rule_table; const TRowIndex& row_index; const TIdIndex& id_index; const TNameIndex& name_index; private: TRowIndex& row_index_writeable; }; class DataTableView { DataTableView(const DataTable& source_table) {} // How can I implement this? // I want filtering, sorting, signaling upper GUI layer, and sorting, and ... }; int main() { Data data1; data1.id = 1; data1.name = "name1"; Data data2; data2.id = 2; data2.name = "name2"; DataTable table; table.push_back(data1); DataTable::iterator it1 = table.row_index.iterator_to(table[0]); table.erase(it1); table.push_back(data1); Data new_data(table[0]); new_data.name = "new_name"; table.replace(table.row_index.iterator_to(table[0]), new_data); for (unsigned i = 0; i < table.size(); ++i) std::cout << table[i].name << std::endl; #if 0 // using scenarios: DataTableView table_view(table); table_view.fill_from_source(); // synchronization with source table_view.remove(data_item1); // remove item from view table_view.add(data_item2); // add item from source table table_view.filter(filterfunc); // filtering table_view.sort(sortfunc); // sorting // modifying from source_able, hot to signal the table_view? // FYI: Table view is atteched to a GUI item table.erase(data); table.replace(data); #endif return 0; }

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• Question about mod_rewrite rule for redirecting failing pages

  - by SimpleCoder

  I'm setting up a mod_rewrite rule that redirects failing pages to a custom Page Not Found page. This is with Wordpress. I'm using the guide here: http://httpd.apache.org/docs/2.2/rewrite/rewrite_guide_advanced.html#redirect404. My rule so far looks like this: RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.+) http://example.com/?page_id=254 [R] This works. It seems to be a combination of the first and second suggestion that worked, since the -U flag did nothing. My question is, out of curiosity why the following happens: When I change REQUEST_FILENAME to REQUEST_URI (as the second example suggests), the page loads, but none of the style sheets load. All of my formatting is gone, and this happens on every page. Can anyone think of why this might happen?

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• boot loading problem after wubi installation of Ubuntu 12.04 on Win7

  - by user63085

  I was new in Ubuntu OS and I was just trying to use wubi windows installer to get a Ubuntu first for hands-on. I followed exactly the same as the instructions and after reboot win7, there is no Ubuntu selection in windows boot manager, with only Windows 7 showing there evilly -.- What I've found out was that the grub folder inside Ubuntu folder ( in my C:\ drive) was empty, either inside the ubuntu\disks\grub or ubuntu\install\grub. I thought this might be the reason why I could not load ubuntu during startup. Cause I've also looked into the EasyBCD settings, and ubuntu entry with Bootloader Path: \ubuntu\winboot\wubildr.mbr was lying there peacefully, looking perfectly fine. However it was not in boot loader actually. Is there a way to restore the grub folder with grub2, or is there any way to fix this problem so that I can find the "Ubuntu" selection at windows startup? Very appreciate your help :) Henry

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