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• When can I be sure a directed graph is acyclic?

  - by Daniel Scocco

  The definition for directed acyclic graph is this: "there is no way to start at some vertex v and follow a sequence of edges that eventually loops back to v again." So far so good, but I am trying to find some premises that will be simpler to test and that will also guarantee the graph is acyclic. I came up with those premises, but they are pretty basic so I am sure other people figured it out in the past (or they are incorrect). The problem is I couldn't find anything related on books/online, hence why I decided to post this question. Premise 1: If all vertices of the graph have an incoming edge, then the graph can't be acyclic. Is this correct? Premise 2: Assume the graph in question does have one vertex with no incoming edges. In this case, in order to have a cycle, at least one of the other vertices would need to have two or more incoming edges. Is this correct?

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• Register Schema Master in Active Directory

  In order to view the complete schema in AD, I have to register the schmmgmt.dll and then open a snap in in MMC, the steps can be summarized as: Go to CMD> Windows System Folder > System32 folder Type in "regsvr32 schmmgmt.dll" Open MMC > File > Add/Remove Snap-In > Active Directory Schema Then I can browser all available attributes in this AD Schema  ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Register Schema Master in Active Directory

  In order to view the complete schema in AD, I have to register the schmmgmt.dll and then open a snap in in MMC, the steps can be summarized as: Go to CMD> Windows System Folder > System32 folder Type in "regsvr32 schmmgmt.dll" Open MMC > File > Add/Remove Snap-In > Active Directory Schema Then I can browser all available attributes in this AD Schema  ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How do I programatically determine which port a SQL Server is running on?

  - by Ralph Willgoss

  How do I programatically determine which port a SQL Server is running on?/*===== Param ref for xp_readerrorlog ===1. Value of error log file you want to read: 0 = current, 1 = Archive #1, 2 = Archive #2, etc...2. Log file type: 1 or NULL = error log, 2 = SQL Agent log3. Search string 1: String one you want to search for4. Search string 2: String two you want to search for to further refine the results5. Search from start time6. Search to end time7. Sort order for results: N'asc' = ascending, N'desc' = descendingHow many error logs do I have?SMSStudio -> Management -> SQL Server Logs -> (right click) -> configure = see values*/USE MasterGO--  get log countDECLARE @logcount intDROP TABLE #ResultCREATE TABLE #Result (ArchiveNo int, Date datetime, Size int)INSERT INTO #ResultEXEC xp_enumerrorlogsSET @logcount = (SELECT COUNT(*) FROM #Result)-- search logsDECLARE @counter intSET @counter = 0WHILE @counter <= @logcountBEGIN    EXEC xp_readerrorlog @counter, 1, N'Server is listening on', 'any', NULL, NULL, N'asc'    SET @counter = @counter + 1ENDGO

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• Hints to properly design UML class diagram

  - by mic4ael

  Here is the problem. I have just started learning UML and that is why I would like to ask for a few cues from experienced users how I could improve my diagram because I do know it lacks a lot of details, it has mistakes for sure etc. Renovation company hires workers. Each employee has some kind of profession, which is required to work on a particular position. Workers work in groups consisting of at most 15 members - so called production units, which specializes in a specified kind of work. Each production unit is managed by a foreman. Every worker in order to be able to perform job tasks needs proper accessories. There are two kind of tools - light and heavy. To use heavy tools, a worker must have proper privileges. A worker can have at most 3 light tools taken from the warehouse.

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• Real life example of an agile game development process

  - by Ken

  I'm trying to learn about applying agile methodologies to game development. But seems to be impossible to find real life examples. What I am looking for are things like; Initial user stories Final user stories (complete, covering the entire game requirements) Acceptance criteria Task list Sprint backlogs (before and after each sprint) The agile books seem to have some limited examples, many of which seem contrived. In this era of open source software, there must be an documented example of the process applied to a game that is publicly available. I am asking specifically about games because they are so different from normal applications. Regular applications are built to all users to complete specific tasks in order to get stuff done(book a room, print a report etc). People play games for much less tangible reasons, so I think the process is significantly different. [it doesn't have to be scrum, it could be any process, just needs to be a real life example game and be reasonably complete]

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• October 2012 Chicago IT Architects Group Meeting Recap

  - by Tim Murphy

  It seemed very ironic that the day we have a presentation on the architecture of building applications for Windows 8 the Surface tablet is opened for pre-order.  Tom Benton started the evening enlightening the attendees on the user experience for those who had not seen it yet.  He even passed around his table from last year’s Build conference for everyone to play with.  This was followed with a tour of the capabilities and structures that make up a Windows Store App on Windows 8.  Taking it to its conclusion, he rounded out the discussion by covering the certification and deployment process. As usual it was great to see a lot of familiar faces last night.  We are always looking for more people to join in our discussions.  Stay tuned here for announcements up upcoming meetings and topics.  Also, if you have a topic you would like to present or see presented feel free to contact me through this blog. del.icio.us Tags: Chicago Information Technology Architects Group,CITAG,Winodws 8,Windows Store,Tom Benton

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• Looking for information on Scholastic BASIC programming books from the mid-1980s

  - by Jason Berkan

  My very first introduction to programming was in grade school, when I would purchase books full of BASIC code listings from the Scholastic school catalogue. Lately I have been searching teh Internetz for information on these books, but without any success. Does anyone know or remember anything about these books? All I can recall is that they were large paperbacks full of various BASIC code listings, some of which were game like. They all included instructions on how to modify the code listings for the different systems of the day, and I distinctly remember that they would always ask for a number in order to seed the RANDOMIZE command (since I figured out on my own that RANDOMIZE TIMER eliminated the need for the question and answer).

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• Lenovo IdeaPad P400 - Disabling the annoying requirement for the Fn key to use F1-F12

  - by Yon

  On Lenovo laptops, in order to use F5 you need to press Fn-F5 (same with F1-F12). It's really annoying and I'd like to reverse the situation. On Windows, a Lenovo driver could help: http://forums.lenovo.com/t5/ThinkPad-Edge-S-series/Disable-Fn-Keys-E420/td-p/803609 How can I resolve this on Ubuntu 12.04? I couldn't find Lenovo drivers for Linux. UPDATE: Found a peculiar solution for this on Windows. Can anyone recommend a good equivalent for Xubuntu: http://forums.lenovo.com/t5/IdeaPad-Y-U-V-Z-and-P-series/How-do-you-reset-the-function-keys-on-a-P500-ideapad-to-legacy/td-p/958995

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• How do I handle priority and propagation in an event system?

  - by Peeter

  Lets say I have a simple event system with the following syntax: object = new Object(); object.bind("my_trigger", function() { print "hello"; }); object.bind("my_trigger", function() { print "hello2"; }); object.trigger("my_trigger"); How could I make sure hello2 is printed out first (I do not want my code to depend on which order the events are binded). Ontop of that, how would I prevent my events from propagating (e.g. I want to stop every other event from being executed)

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• Why do I need to relaunch dkpg-reconfigure keyboard-configuration after every startup?

  - by yves Baumes

  I've switched recently to an UK keyboard, from a FR keyboard. It is an usb keyboard, and first I plugged it in, I had to launch dpkg-reconfigure keyboard-configuration in order to request the correct layout (ie: uk). But after every reboot of the machine, the laytout comes back to the FR layout. How can I make the modification persisting? I am using Ubuntu, running the Stump Window Manager. And here is the /etc/default/keyboard at any time (that is right after startup, and before and after I run the dpkg-reconfigure tool) XKBMODEL="hhk" XKBLAYOUT="gb" XKBVARIANT="" XKBOPTIONS="terminate:ctrl_alt_bksp"

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• Mixing self signed certs with traditional SSL

  - by brentonstrine

  I have a traditional SSL cert going to a subdomain secure.mydomain.com on my domain. My host required me to have a dedicated IP in order to do this. I would also like to use HTTPS on my site for when I log into WordPress, etc. and since this is just for me, I don't mind self signing it and clicking through the scary messages. Is there a way to use a self signed cert for mydomain.com/wp-admin (just for me) when I already am on a dedicated IP that already has a traditional SSL cert for normal users on secure.mydomain.com? (FWIW, I'm on WHM without root access.)

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• My Rhythmbox plugin can't meet the Ubuntu Software Center "my-app" requirements

  - by allquixotic

  At http://developer.ubuntu.com/publish/my-apps-packages/ the following technical requirements are cited: Technical requirements In order for your application to be distributed in the Software Centre it must: Be in one, self-contained directory when installed Be able to be installed into the /opt/ directory (*) Be executable by all users from the /opt/ directory (**) Write all configuration settings to ~/.config/ (This can be one file or a directory containing multiple configuration files) A Rhythmbox plugin cannot satisfy any of these requirements. Rhythmbox has compiled-in locations where it looks for installed plugins. So, is there no way for me to publish my app in Ubuntu Software Center? Would it have to go into Universe repository (which would require tremendously more work and political maneuvering to get it accepted)? I already have all the Debian package infrastructure built for it, so I have made a PPA for it.

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• How do I reload the clock applet?

  - by Agmenor

  It seems I am running this bug. Sometimes my clock applet just stops running, and I have a pop-up window saying 'The clock has quit unexpectedly'. Between 'Reload' and 'Close', I have unfortunately chosen the second option. Even if I have rebooted, I cannot launch the applet anymore. I am on Ubuntu 10.10. Can somebody give me the command line that I could use in the application launcher appearing when Alt + F2 are hit ? Or any other solution in order to recover the applet on the gnome-panel ?

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• How to maximize Java resources for gaming?

  - by Keidax

  I notice that when I play Minecraft, my CPU usage is only around 15 to 20 percent, at most. Is it possible to force my computer to allocate as much RAM, CPU time, etc. to the game, in order to get the best experience possible? Or, is the low CPU usage due to limitations in the JVM or the game code itself? I have OptiFine installed, and I've already tried using renice to change the process priority and -Xmx to allocate more memory to Java. What else can I do?

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• How to spawn a character at certain point and walk to a set point

  - by Robert H.

  I am making a game where I have a background image of a neighborhood. Each location has a different number of customers that are generated to walk on sidewalks. They all walk to a specific location (like a stand or cart that sells stuff), after they get to location I want them to interact with the cart. However, if another customer is already in a sale interaction then the others get in line in order of arrival. After the transaction the customers walk off screen. Any information on how I can do this and what game engine would be needed? Any one have any idea where I should go for this. I already have my game done up through Eclipse/Java without any game engine.

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• Isometric projection bad coordonate

  - by Christophe Debove

  I have a 2D map, for each element I apply this isometric projection to place my Sprite //Element e; float[] f= projection(e.getX(), e.getY() ,z); // x and y represent Sprite Coordonate (tile_width and height depend of my // camera size and the number of elements in x and in y float x = f[0]*tile_width; float y = f[1]*tile_height; public float[] projection(float x, float y, float z) { return new float[]{ (( x )-(y) ) , ((x/2) + (y/2) - z )}; } the sprite for one element : The result of my projection : The problem is I need to add an offset of tile_height/2 to the y and tile_width/2 to the x to have something like this (in the red rectangle I drawed with paint what I want) : Where did I make wrong? (I found the projection method in How should I sort images in an isometric game so that they appear in the correct order? )

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• How to embed an authorize.net payment gateway form into a single page website with one item for sale?

  - by Adam S

  My website sells one item. I am currently using the simple checkout button embedded on the website. Rather than having the button I would like the order form to be on the single page with a field for quantity. At first I imagined that there would be a simple form that I could embed however it looks like that I need a full integration into my website through the Advanced Integration Method (AIM) which is much more complicated then I wanted. I don't want integration into my website, can I do it without, and if I have to what is the cleanest and simplest way to do it?

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• Boot Ubuntu from a bootable USB hangs on purple screen

  - by user210946

  I recently bought a laptop (Lenovo Y410P) with Windows 8 pre-installed and I'm trying to dual boot Windows 8 and Ubuntu 13.0. I created a bootable usb using Pendrive. Then I changed the Boot Mode to Legacy Support and the boot order so it boots from the flash storage first. When I restarted the computer, I got the error message "SYSLINUX 4.06 EDD 2012-10-23 Copyright (c) 1994-2012 H. Peter Anvin et al" and it just hung there. Fair enough. After some googling I formatted my flash drive in FAT format instead of FAT32. The "SYSLINUX..." error message is gone but now it hangs on a purple screen http://imgur.com/WbdXpZN Does anyone have a suggestion what to do here? I've looked at various posts but none of them seems to have a solution that the author confirmed it worked.

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• How to avoid code duplication for a system which has logic that may change year wise?

  - by aravind

  What would be the way to design a system which has logic that may change year wise? There is an application which conducts online exams. There are five questions for a particular subject. The questions may (or may not) change year wise. As per my current design, the questions in database are stored year wise. There are some year specific code logic as well. In order to enable the application for another year, the year specific database records and code will be copied or duplicated. How to avoid this code duplication?

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• NHibernate Pitfalls: Lazy Scalar Properties Must Be Auto

  - by Ricardo Peres

  This is part of a series of posts about NHibernate Pitfalls. See the entire collection here. NHibernate supports lazy properties not just for associations (many to one, one to one, one to many, many to many) but also for scalar properties. This allows, for example, only loading a potentially large BLOB or CLOB from the database if and when it is necessary, that is, when the property is actually accessed. In order for this to work, other than having to be declared virtual, the property can’t have an explicitly declared backing field, it must be an auto property: 1: public virtual String MyLongTextProperty 2: { 3: get; 4: set; 5: } 6:  7: public virtual Byte [] MyLongPictureProperty 8: { 9: get; 10: set; 11: } All lazy scalar properties are retrieved at the same time, when one of them is accessed.

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• Which tips helped you learn touch-typing? [closed]

  - by julien

  I've been learning touch-typing for about two weeks now, and I'm really commited to mastering this skill. Eventhough I'm doing ok with prose already, I'm struggling with programming syntax and even more with keybindings. Those stray you away from the home row more than regular words, and aren't as easy to practice. So I often hunt and peck in order to just get it out, but when reverting to old habits like this, I find it hard to get back into the touch-typing mindframe quickly. One little trick that has helped me so far when getting lost is to reposition every finger on its home row key, and mentally visualize the layout bias of the keyboard, ie the backslash kind of alignment of key columns. It's hard to describe though and probably a bit weird... Hope you guys have better tips !

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• Custom code in SharePoint

  - by Sahil Malik

  SharePoint 2010 Training: more information Microsoft launched SharePoint 2013 with great fanfare. But what stuck out was the introductory blog post by Corporate SVP of SharePoint, Jeff Teper. You can read the blogpost titled “The New SharePoint”. But one paragraph has stuck out, “Use SharePoint as an out-of-box application whenever possible - We designed the new SharePoint UI to be clean, simple and fast and work great out-of-box. We encourage you not to modify it which could add complexity, performance and upgradeability and to focus your energy on working with users and groups to understand how to use SharePoint to improve productivity and collaboration and identifying and promoting best practices in your organization.” The keywords here is “whenever possible”. The reality is, frequently it is not possible to not customize SharePoint in order to meet the customer requirements. But you must try and minimize SharePoint customization. There are many ways Read full article ....

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• How do I get write access to ubuntu files from Windows?

  - by Steven

  I'm running Ubuntu 11.10 on my Virtual Machine as a web server. I've mounted the W:/ drive in Win 7 to my /www folder in Ubuntu. I can read the files, but I'm not able to write to the files. In Samba, I have created the following user: <www-data> = "<www-data>" And given guest ok for the www folder: [www] comment = Ubuntu WWW area path = /var/www browsable = yes guest ok = yes read only = no create mask = 0755 ;directory mask = 0775 force user = www-data force group = www-data I've also run sudo chmod -R 755 www to make ensure correct rw access. What am I missing in order to get write access to my ubuntu files from Windows?

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• Is committing/checking code everyday a good practice?

  - by ArtB

  I've been reading Martin Fowler's note on Continuous Integration and he lists as a must "Everyone Commits To the Mainline Every Day". I do not like to commit code unless the section I'm working on is complete and that in practice I commit my code every three days: one day to investigate/reproduce the task and make some preliminary changes, a second day to complete the changes, and a third day to write the tests and clean it up^ for submission. I would not feel comfortable submitting the code sooner. Now, I pull changes from the repository and integrate them locally usually twice a day, but I do not commit that often unless I can carve out a smaller piece of work. Question: is committing everyday such a good practice that I should change my workflow to accomodate it, or it is not that advisable? ^ The order is more arbitrary and depends on the task, my point was to illustrate the time span and activities, not the exact sequence.

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