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• Good implementations of reinforced learning?

  - by Paperino

  For an ai-class project I need to implement a reinforcement learning algorithm which beats a simple game of tetris. The game is written in Java and we have the source code. I know the basics of reinforcement learning theory but was wondering if anyone in the SO community had hands on experience with this type of thing. What would your recommended readings be for an implementation of reinforced learning in a tetris game? Are there any good open source projects that accomplish similar things that would be worth checking out? Thanks in advanced Edit: The more specific the better, but general resources about the subject are welcomed. Follow up: Thought it would be nice if I posted a followup. Here's the solution (code and writeup) I ended up with for any future students :). Paper / Code

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• iphone/ipad orientation handling

  - by Mark

  This is more of a general question for people to provide me guidance on, basically Im learning iPad/iPhone development and have finally come across the multi-orientation support question. I have looked up a fair amount of doco, and my book "Beginning iPhone 3 Development" has a nice chapter on it. But my question is this, if I was to programatically change my controls (or even use different views for each orientation) how on earth to people maintain their code base? I can just imagine so many issues with spaghetti code/thousands of "if" checks all over the place, that it would drive me nuts to make one small change to the UI arrangement. Does anyone have experience handling this issue? What is a nice way to control it? Thanks a lot Mark

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• I'm a professional Java developer, should I learn .NET?

  - by Alex Spurling

  Java and .NET seem to have a great number of parallels especially in the web application area. Both languages have many of the same technologies especially in terms of open source libraries (JUnit and NUnit, Hibernate and NHibernate) but there are also plenty of differences and different approaches to solving certain software development problems. As a Java developer I get the feeling I'm missing out on learning about web application development from the .NET point of view and I could learn a lot about the general principles by learning two languages rather than getting stuck in the details of Java and not seeing the bigger picture. So the first question is, do you agree? Does learning two separate but similar languages such as Java and .NET make you a better programmer? Secondly, I'm worried that if I choose to take, for example, a MCPD ASP.NET 3.5 certification it won't actually help me get work doing .NET development because it goes against all my existing experience. Is trying to broaden your skills a good career choice or is it a better decision to choose one technology and stick with that?

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• Handling User Authentication in C#.NET?

  - by Daniel

  I am new to .NET, and don't have much experience in programming. What is the standard way of handling user authentication in .NET in the following situation? 1.In Process A, User inputs ID/Password 2.Process A sends the ID/Password to Process B over a nonsecure public channel. 3.Process B authenticates the user with the recieved ID/Password what are some of the standard cryptographic algorithms I can use in above model? The users(customers that bought my company's software) will be running the software(Process A) locally in their computer(connected to internet). I need to authenticate the users so that only registered users can run the program. Thank You!

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• Good books on Sybase ASE 15?

  - by Ilya Kochetov

  We need to get some good books on Sybase ASE 15 for our developers. The people in the team have previous experience with different SQL flavors (MS SQL, MySQL, Informix and Oracle) but no one worked with Sybase before. Therefore I am looking for two kinds of books: Book for developers on how to use Sybase for queries,sprocs, views etc. Has to be a book for professionals and not something like 'learn SQL in 21 day' Book for the DB administrator on how to maintain the database. This could be on any level and a dummy guide would not go wrong :) Thank you

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• When is assembler faster than C?

  - by Adam Bellaire

  One of the stated reasons for knowing assembler is that, on occasion, it can be employed to write code that will be more performant than writing that code in a higher-level language, C in particular. However, I've also heard it stated many times that although that's not entirely false, the cases where assembler can actually be used to generate more performant code are both extremely rare and require expert knowledge of and experience with assembler. This question doesn't even get into the fact that assembler instructions will be machine-specific and non-portable, or any of the other aspects of assembler. There are plenty of good reasons for knowing assembler besides this one, of course, but this is meant to be a specific question soliciting examples and data, not an extended discourse on assembler versus higher-level languages. Can anyone provide some specific examples of cases where assembler will be faster than well-written C code using a modern compiler, and can you support that claim with profiling evidence? I am pretty confident these cases exist, but I really want to know exactly how esoteric these cases are, since it seems to be a point of some contention.

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• Seeking tuturial: introduction to ODBC with Delphi

  - by mawg

  I have a lot of embedded C/C++/Ada experience and an outdated smattering of Delphi plus some database stuff. Now I have to implement an app in Delphi which can manipulate MySql, Oracle, maybe MS Acess. In short, I need ODBC. I need to programatically created a database, define its structure and populate its contents, then later query its existence and programatically search. I would prefer not to use 3rd party components, unless there is a compelling reason to do so (performance ought not to be an issue for the app, it won't have much data or be run often, at least not in v1.0) . Can anyone point me at a tutorial which can get me up to speed? Thanks

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• Inflector::humanize($key) converts Date of joining TO Date Of Joining

  - by Aruna

  Hi, I have a Form and i am submitting them like using function submit($formid = null,$fillerid=null) { $this->data['Result']['form_id']=$formid; $this->data['Result']['submitter_id']=$fillerid; $this->data['Result']['submitter']=$this->Session->read('filler'); echo "submitter: ".$this->Session->read('filler'); $results=$this->Form->hasResults($this->data); //echo http_build_query($_POST); if(empty($results)){ foreach ($_POST as $key => $value): if(is_array($value)){ $value = implode('', $_POST[$key]); $this->data['Result']['value']=$value; } else{ $this->data['Result']['value']=$value; } $this->data['Result']['form_id']=$formid; $this->data['Result']['submitter_id']=$fillerid; $this->data['Result']['label']=Inflector::humanize($key); $this->data['Result']['submitter']=$this->Session->read('filler'); $this->Form->submitForm($this->data); endforeach; $this->Session->setFlash('Your entry has been submitted.'); } I am having A fORM LIKE <form method="post" action="/FormBuilder/index.php/forms/submit/1/4" id="ResultSubmit"> <div class="input text"><label for="1">Firstname</label><input type="text" value="" style="width: 300px;" id="1" name="Firstname"/></div> <br/> <div class="input text"><label for="2">Last Name</label><input type="text" value="" style="width: 300px;" id="2" name="Last Name"/></div> <br/> <div class="input text"><label for="3">Age</label><input type="text" value="" style="width: 200px;" id="3" name="Age"/></div> <br/> <center> <span id="errmsg3"/> </center> <div class="input textarea"><label for="4">Address</label><textarea style="height: 300px;" id="4" rows="6" cols="30" name="Address"/></div> <br/> <div class="input text"><label for="5">Date Of Joining</label><input type="text" value="" style="width: 300px;" id="5" name="Date of joining"/></div><br/> <div class="input text"><label for="6">Email - Id</label><input type="text" value="" style="width: 300px;" id="6" name="Email - id"/></div> <br/> <div class="input text"> <label for="7">Personal Number</label><input type="text" value="" maxlength="3" style="width: 30px;" id="7" name="Personal Number[]"/><input type="text" value="" style="width: 30px;" maxlength="3" id="7-1" name="Personal Number[]"/><input type="text" value="" style="width: 70px;" maxlength="4" id="7-2" name="Personal Number[]"/></div> <span id="errmsg7"/> <br/> <div class="input select"><label for="8">Gender</label><select id="8" name="Gender"> MaleFemale <div class="input text"><label for="9">Official Number</label><input type="text" value="" style="width: 200px;" id="9" name="Official Number"/></div><br/> <div class="input select"><label for="10">Experience</label><select id="10" name="Experience"> <option value="Fresher">Fresher</option><option yrs="" 5="" value="Below">Below 5 Yrs</option><option yrs="" 10="" value="Above">Above 10 yrs</option></select></div><br/> actually My input has the names as Firstname Last Name Age Address Date of joining Email - id Personal Number Gender Official Number But when i use Inflector::humanize($key) for saving the names which has white space characters they have converted into like Date Of Joining i.e.., O and J becomes Capital letters... But i need to save them as such as Date of joining.. How to do so???

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• PHP + SQL Server or VB.NET + MySQL

  - by Muhammad Mussnoon

  Can someone suggest that out of the two mentioned (odd?) combinations, which is less odd, or in other words, is less trouble to work with + maintain. If it helps, the system is going to have two front-ends - one web application and one desktop application. The desktop application is going to be coded using VB.NET, and the web application in PHP. There's really no reason why the desktop application can't be replaced by a web application as well - except that one of the programmers seem to really want to code it in VB.... However, none of us have experience working with either of these pairs (you could easily call us n00bs), so we are a bit apprehensive to start. P.S. hosting service will be gotten from some provider and not be on the client's own server.

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• Resources for Programmatic Rendering of Topology Maps

  - by bn

  Servus, Do you know of any frameworks, APIS, languages, or other resources that are well suited for drawing topology maps that allow a user to interact with objects on the map? I am not constrained by language choice and the program can be web-based, or stand-alone. I thought I would check before rolling my own. My goal is not to draw cartographic maps, but more like this picture: http://www.fineconnection.com/files/images/GraphicalNM.PNG, or if you are familiar with Edward Tufte's books, the data-visualization mechanisms he describes such as a map of a metro or subway. Also, if you have had any experience rendering these types of user interfaces or usage of underlying datastructures, I would be grateful to hear any thoughts you have on the subject, advice, any "gotchas." Thank you very for your time, -bn

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• What is the most Word-like ASP.NET custom control that you can buy?

  - by rtemp

  We are looking to implement a rich-text box in an ASP.NET application and our requirements are specific to using the "Track Changes" features of Microsoft Word. The closest thing we found in the RadEditor by Telerik. This is a nice control that has a "Track Changes" button and will give you the ability to track the changes from the text in the box to now. It does not let you track your changes from the two previous versions. We have used CVSWeb in the past and the display was not great but it did have the ability (in a web page) to diff two different versions of text (source code in this case). Does anyone have any experience or know of any web-based diff tools that work nicely with a rich-text editor in the web?

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• How to convert from K&R C to ANSI C?

  - by Vadakkumpadath

  I am trying to execute following code which is the 1988 entry of Obfuscated C Code Contest. #define _ -F<00||--F-OO--; int F=00,OO=00;main(){F_OO();printf("%1.3f\n",4.*-F/OO/OO);}F_OO() { _-_-_-_ _-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_ _-_-_-_ } From entry description, this code is calculating pi by looking at its own area. I successfully compiled it without changing the code. But when I executed, it is giving me a value 0.25, what I am expecting is 3.14. Code description says it is in K&R C and it doesn't work correctly in ANSI C without some change. I think I have to do those modification to execute it properly. I don't have any previous experience with K&R C. So can someone help me to change above code to ANSI C or point to the problems if any. I am using Microsoft Visual Studio 2008 to execute this.

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• What every web developer should know?

  - by arikfr

  Let's say you got a new intern, who's a third-year CS student. He has firm knowledge of the basics, has some experience with C/Java from the courses he took and a lot of desire to learn more. What would you teach him in order to become a good web developer? What I had in mind is: HTML/CSS and the importance of writing semantic markup Javascript, some JS framework (jQuery), JSON Basics of Git/Subversion (whatever you use) The language we use (Ruby, Python, PHP, C#, whatever) Introduction the web framework we use (Rails, Django, ASP.NET MVC...) MVC - what/why/who RESTful web services - how to consume them and how to create one What's on your list?

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• FakeTable with tSQLt remove triggers

  - by user1454695

  I have jsut started to use tSQLt and is about to test a trigger. I call the FakeTable procedure and do my test but the trigger is not executed. If don't use FakeTable the trigger is executed. That seems to be really bad and I canät find any info that there is any method to readded them. Then I thought the triggers are removed by FakeTable but I can recreate them after the call and did the following code in my test: DECLARE @createTrigger NVARCHAR(MAX); SELECT @createTrigger = OBJECT_DEFINITION(OBJECT_ID('MoveDataFromAToB')) EXEC tSQLt.FakeTable 'dbo.A'; EXEC(@createTrigger); I got the following error: "There is already an object named 'MoveDataFromAToB' in the database.{MoveDataFromAToB,14} (There was also a ROLLBACK ERROR -- The current transaction cannot be committed and cannot be rolled back to a savepoint. Roll back the entire transaction.{Private_RunTest,60})" Anyone that have any experience with tSQLt and know anyworkaround for this problem?

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• Manipulating multi-track ogg files programatically

  - by Chad Birch

  I'm planning to create a program for manipulating multi-track OGG files, but I don't have any experience with the relevant libraries, so I'm looking for recommendations about which language/library to use for this. I don't really have any preference for the language, I'll happily code it in C, C#, Python, whatever makes things the easiest (or even possible). Perhaps it's even a possibility to automate Audacity somehow? In terms of requirements, I'm not looking for anything particularly fancy. It will probably be a command-line program, I don't need to be able to play the audio, draw image representations of the waveforms, etc. The program will basically be used as a converter, but I need to do some processing before outputting. That is, I need the ability to programatically remove some tracks, set panning per-track, change track volumes, etc. Nothing too complex, just some basic processing, and then output the result in either MP3 or a format easily converted to MP3, such as WAV. Any suggestions or general information would be appreciated, thanks.

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• MVVM Light toolkit - maintained? Here today - gone tomorrow? ...

  - by mark smith

  Hi there, I have been taking a look at mvvm light toolkit, i must admit i haven't got a lot of experience with it but i live what i see.. I did use the mvvm toolkit (microsoft) but currently use vs 2010 and no templates are available as yet. I was looking for some insight into mvvm light toolkit... Is it always maintained ? i..e its not going to be gone tomorrow... Or shoudl i be looking elsewhere?? I would really appreciate any feedback... I also saw some info on how it is blendable which the mvvm toolkit (microsoft) didn't seem to have.. Prism also seems to be also a likely candidate but from what i understand its not a MVVM framework / toolkit i would be using it with wpf Any help really appreciated Thank you

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• Microsoft Dynamics CRM -- Do people build websites with it?

  - by Marcy Sutton

  Forgive my ignorance, but do people build websites with Microsoft Dynamics CRM? I have a potential client who says that is the technology they will use for a new web project, for which I would be doing the HTML templating. I want to learn all I can as I am new to this particular system, but I can't seem to find anything related to web building and CRM. Is it more likely the client is developing another piece of technology to work with the CRM that they are neglecting to tell us about? Any experience or insight about this process is greatly appreciated!

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• Using pyodbc to insert rows into a MS Access MDB, how do I escape the paramaters?

  - by MDBGuy

  Hi, I'm using pyodbc to talk to a legacy Access 2000 .mdb file. I've got a cursor, and am trying to execute this: c.execute("INSERT INTO [Accounts] ([Name], [TypeID], [StatusID], [AccountCat], [id]) VALUES (?, ?, ?, ?, ?)", [u'test', 20, 10, 4, 2]) However, doing so results in pyodbc.Error: ('HYC00', '[HYC00] [Microsoft][ODBC Microsoft Access Driver]Optional feature not implemented (106) (SQLBindParameter)') I understand I can simply change the question marks to the literal values, but in my experience proper escaping of strings across databases is... not pretty. PHP and mysql team up to bring mysql_real_escape_string and friends, but I can't seem to find pyodbc's function for escaping values. If you could let me know what the recommended way of inserting this data (from python) is, that'd be very helpful. Alternatively, if you have a python function to escape the odbc strings, that would also be great. Thanks for the help.

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• Make jqGrid fill it's container

  - by Horacio

  I am using the jQuery layout plugin and the jqGrid plugin in one of my projects and they work great except for a little problem... I want the jqGrid to fill up completely the pane (jQuery layout pane) that contains it. Resizing the pane should resize the jqGrid, closing the pane should hide the jqGrid, etc, etc... Both jqGrid and jQuery Layout provide callbacks but when I use them the page layout breaks horribly. Has anyone any experience mixing jqGrid with jQuery Layout? http://www.secondpersonplural.ca/jqgriddocs/index.htm http://layout.jquery-dev.net/

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• Open-source comment engines

  - by Jim Greenleaf

  I'm looking for a solid open-source commenting engine written in PHP. It needs to have workflow/moderation capabilities as well. I've checked into Disqus, and while I like the concept, the site owner's may develop their own login system at a later point, which would have to integrate with the comment system. Also, I'm not sure that they want the comments hosted remotely. Does anyone have any recommendations that I might look into? Alternatively, if you have experience with Disqus, what do you like/dislike about it?

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• Asterisk AGI framework for IVR; Adhearsion alternative?

  - by tedbehling

  I am trying to get started writing scalable, telecom-grade applications with Asterisk and Ruby. I had originally intended to use the Adhearsion framework for this, but it does not have the required maturity and its documentation is severely lacking. AsteriskRuby seems to be a good alternative, as it's well documented and appears to be written by Vonage. Does anyone have experience deploying AGI-based IVR applications? What framework, if any, did you use? I'd even consider a non-Ruby one if it's justified. Thanks!

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• GWT Post build command in Eclipse

  - by Henrik

  I am starting getting used to Eclipse, but I have much more experience with Visual Studio. In Visual Studio it is possible to run auto commands after the build has finished. Now I am creating a GWT project and several other projects at once in one solution (or workspace) in Eclipse. Some files which are compiled with the GWT project needs to be copied to another location when they have been compiled. I am currently doing this manually and would like to do it automatically. I am not doing it often, since the project works fine in debug mode (...?gwt.codesvr=localhost:9997). But where is the location for executing a post build command for a GWT project in eclipse? Is it possible?

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• jqtransform form events problem

  - by Newbie

  I'm a web designer with css experience, but I'm not a JS developer. I used jqtransform to style a search form , the problem is it removes all events from selectors and the search button . here is the code before jqtransform <input id="go-search" type="button" name="btn_search" value="search" onclick="searchLocations()" /> and after applying the script, the button doesn't do any thing I opened the page source and here how it looks like: <button class=" jqTransformButton" type="button" name="btn_search" id="go-search"><span><span>search</span></span></button> Please help me !

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• Dice face value recognition

  - by Jakob Gade

  I’m trying to build a simple application that will recognize the values of two 6-sided dice. I’m looking for some general pointers, or maybe even an open source project. The two dice will be black and white, with white and black pips respectively. Their distance to the camera will always be the same, but their position on the playing surface will be random. (not the best example, the surface will be a different color and the shadows will be gone) I have no prior experience with developing this kind of recognition software, but I would assume the trick is to first isolate the faces by searching for the square profile with a dominating white or black color (the rest of the image, i.e. the table/playing surface, will in distinctly different colors), and then isolate the pips for the count. Shadows will be eliminated by top down lighting. I’m hoping the described scenario is so simple (read: common) it may even be used as an “introductory exercise” for developers working on OCR technologies or similar computer vision challenges.

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• Are these good interview questions for Flex developer?

  - by Ivan Belov

  I am responsible for creating a team, which will build a Flex application. Unfortunately I have zero experience with Flex. So I found an expert within our company to interview candidates. Our expert came up with the following questions: how to write item renderers explain methods commitProperties, updateDisplayList, measure binding positive / negative parts, problems with binding what is ClassFactory ? And why is it needed ? how callLater works ? what is layoutChrome ? what is skin ? did you use autogeneration for Java backend ? how to override managers ? like PopupManager . These sound a little too specific for my taste. Would you say they are decent questions? Is it fair to say, for example, that if Flex developer does not know how to write item renderer, he has very little knowledge of Flex?

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