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• Plain-English tutorial on artificial neural networks?

  - by Stuart

  I've Googled, StackOverflowed, everything, and I cannot seem to find a tutorial I can understand. I understand the concept of genetic algorithms, and how to implement them, (Though I haven't tried) but I cannot grasp the concept of neural networks. I know vaguely how they work... And that's about it. Could someone direct me to a tutorial that could help someone who has not even graduated middle school yet? Sure, I'm several years ahead of the majority of people my grade, but I don't understand summation, (which I apparently need if I don't want a simple binary output) vectors, and other things that I apparently should know. Is there a simple, bare-bones tutorial for neural networks? After I learn the basics, I'll proceed to more difficult ones. Preferably, they would be in Java. Thanks!

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• Cookies with urllib

  - by CMC

  This will probably seem like a really simple question, and I am quite confused as to why this is so difficult for me. I would like to write a function that takes three inputs: [url, data, cookies] that will use urllib (not urllib2) to get the contents of the requested url. I figured it'd be simple, so I wrote the following: def fetch(url, data = None, cookies = None): if isinstance(data, dict): data = urllib.urlencode(data) if isinstance(cookies, dict): # TODO: find a better way to do this cookies = "; ".join([str(key) + "=" + str(cookies[key]) for key in cookies]) opener = urllib.FancyURLopener() opener.addheader("Cookie", cookies) obj = opener.open(url, data) result = obj.read() obj.close() return result This doesn't work, as far as I can tell (can anyone confirm that?) and I'm stumped.

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• Enabling PostgreSQL support in PHP on Mac OS X

  - by Jordan Scales

  I'm having a terribly difficult time getting the command "pg_connect()" to work properly on my Mac. I'm currently writing a PHP script (to be executed from console) to read a PostgreSQL database and email a report. I've gone into my php.ini file and added extension=pgsql.so But, I'm met with the following error. PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/extensions/no-debug-non-zts-20090626/php_pgsql.so' - dlopen(/usr/lib/php/extensions/no-debug-non-zts-20090626/php_pgsql.so, 9): image not found in Unknown on line 0 PHP Fatal error: Call to undefined function pg_connect() in... (blah file here) When running phpinfo(), I see nothing about PostgreSQL, so what is my issue here?

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• Extracting a string starting with x and ending with y

  - by DMan

  First of all, I did a search on this and was able to find how to use something like String.Split() to extract the string based on a condition. I wasn't able to find however, how to extract it based on an ending condition as well. For example, I have a file with links to images: http://i594.photobucket.com/albums/tt27/34/444.jpghttp://i594.photobucket.com/albums/as/asfd/ghjk6.jpg You will notice that all the images start with http:// and end with .jpg. However, .jpg is succeeded by http:// without a space, making this a little more difficult. So basically I'm trying to find a way (Regex?) to extract a string from a string that starts with http:// and ends with .jpg

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• Anyone use Distributed VCS in a corporate environment?

  - by Eddie Parker

  I'm curious to hear about people's experiences with distributed version control in a corporate environment. Specifically: Was it difficult to gain adoption? Now that it's in place, is it well liked? What 'model' are you using (hub & spoke? Something else?) Allowing you use hub & spoke, are there any discipline problems with pushing to a central server? I'd like to hear if anyone has non-programmers working within this environment, preferably artists and the like to whom VCS can be a bit daunting. Did it work out for them?

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• How to setup a DotNetNuke Development Environment with Source Control?

  - by Joosh21

  My team is developing a new DotNetNuke web application and would like to know what is recommended to setup a development environment with source control and automated builds? We would like to keep the DNN source code separate from our custom modules and extensions source code. The DotNetNuke Compiled Module template for Visual Studio wants us to store the source code in the DesktopModules directory of the DNN source code and output to the DNN source code bin directory. Is this the recommended structure? I would rather keep the files in different locations, but then it becomes more difficult to run and debug locally as it would require an install of the module for each change. Also, how should an automated build deploy any changes? How have others set this up? Is there a recommended best practice?

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• best way to parse plain text file with a nested information structure

  - by Beffa

  The text file has hundreds of these entries (format is MT940 bank statement) {1:F01AHHBCH110XXX0000000000}{2:I940X N2}{3:{108:XBS/091502}}{4: :20:XBS/091202/0001 :25:5887/507004-50 :28C:140/1 :60F:C0914CHF7789, :61:0912021202D36,80NTRFNONREF//0887-1202-29-941 04392579-0 LUTHY + xxx, ZUR :86:6034?60LUTHY + xxxx, ZUR vom 01.12.09 um 16:28 Karten-Nr. 2232 2579-0 :62F:C091202CHF52,2 :64:C091302CHF52,2 -} This should go into an Array of Hashes like [{"1"=>"F01AHHBCH110XXX0000000000"}, "2"=>"I940X N2", 3 => {108=>"XBS/091502"} etc. } ] I tried it with tree top, but it seemed not to be the right way, because it's more for something you want to do calculations on, and I just want the information. grammar Mt940 rule document part1:string spaces [:|/] spaces part2:document { def eval(env={}) return part1.eval, part2.eval end } / string / '{' spaces document spaces '}' spaces { def eval(env={}) return [document.eval] end } end end I also tried with a regular expression matches = str.scan(/\A[{]?([0-9]+)[:]?([^}]*)[}]?\Z/i) but it's difficult with recursion ... How can I solve this problem?

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• Filtering model results for Django admin select box

  - by blcArmadillo

  I just started playing with Django today and so far am finding it rather difficult to do simple things. What I'm struggling with right now is filtering a list of status types. The StatusTypes model is: class StatusTypes(models.Model): status = models.CharField(max_length=50) type = models.IntegerField() def __unicode__(self): return self.status class Meta: db_table = u'status_types' In one admin page I need all the results where type = 0 and in another I'll need all the results where type = 1 so I can't just limit it from within the model. How would I go about doing this?

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• Where to get MSDN Help Viewer for 2010 like earlier MSDN with Index, Tree and one window?

  - by Akash Kava

  I upgraded to Visual Studio 2010 RC, and I remember filling one big form for MSDN help improvement campaign and I was wondering I will get to see a Help Viewer like MSDN included in Visual Studio 2008, which included One Program (Not IE), Index and the way to view preferred language setting. Google results shows that there were headlines that Microsoft Help Viewer released for 2010 RC, but where is it? is it the same one which opens in IE and has absolute difficult way to view it? Current MSDN opening in IE is so inconvenient, there is no index, there is no grouping of content, like I typed search for TextBox and it showed up for ASP.NET, WinForms and I got lost to find out the reference in multiple pages for search results.

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• Suppress/Override application.html.erb

  - by user310628

  Is there any way to suppress the default js and css loaded by application.html.erb on a view by view basis? I'm finding it incredibly difficult to manage a global css and js includes configuration when certain views need different js libraries that for some reason seem to be conflicting with one another. For example, I might want jquery 1.3 for one view and 1.4.2 for another. I don't necessarily want to have to have an include for every view (I do want to have a global site-wide default), but I would also like to be able to override those for any view I want. Thanks!

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• How to generate complex url like stackoverflow?

  - by Freewind

  I'm using playframework, and I hope to generate complex urls like stackoverflow. For example, I want to generate a question's url: http://aaa.com/questions/123456/How-to-generator-a-complex-url Note the last part, it's the title of the question. But I don't know how to do it. UPDATED In the playframework, we can define routes in conf/routes file, and what I do is: GET /questions/{<\d+>id} Questions.show In this way, when we call @{Questions.show(id)} in views, it will generate: http://aaa.com/questions/123456 But how to let the generated has a title part, is difficult.

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• How to detect code duplication during development ?

  - by David Dibben

  We have a fairly large code base, 400K LOC of C++, and code duplication is something of a problem. Are there any tools which can effectively detect duplicated blocks of code? Ideally this would be something that developers could use during development rather than just run occasionally to see where the problems are. It would also be nice if we could integrate such a tool with CruiseControl to give a report after each check in. I had a look at Duploc some time ago, it showed a nice graph but requires a smalltalk environment to use it, which makes running it automatically rather difficult. Free tools would be nice, but if there are some good commercial tools I would also be interested.

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• C++ Primer (Stanley Lipmann) or The C++ programming language (special edition)

  - by Kim

  I have a Computer Science degree (long2 time ago) .. I do know Java OOP but i am now trying to pick up C++. I do have C and of course data structure using C or pascal. I have started reading Bjarne Stroustrup book (The C++ Programming Language - Special Edition) but find it extremely difficult esp. some section which i don't have exposure such as Recursive Descent Parser (chapter 6). In terms of the language i don't foresee i have problem but i have problem as mentioned cos' those topic are usually covered in a Master Degree program such as construction of compiler. I just bought a book called C++ primer (Stanley Lipmann) which i heard it is a very good book for C++. Only setback is it's of course no match with the amount of information from the original C++ creator. Please advice. Thanks.

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• How do I do a postback to a CGI service

  - by TheLearner

  I am building a C# client for a CGI service (not sure what its called exactly). It accepts a bunch of XML and spits out a response. I have tested it straight in Firefox and it works (see below). Now I am not sure how to do this in C# code though? Does anyone have a helpful snippet of code, I can't imagine it would be that difficult? http://www.travelcommunications.co.uk/cgi-bin/d3web_gzip.ssh?%3CTCOML%20version=%22NEWFORMAT%22%3E%3CTransferOnly%3E%3CAvailability%3E%3CRequest%3E%3CAgentCode%3ETEST%3C/AgentCode%3E%3CAgentType%3ETA%3C/AgentType%3E%3CDeparturePointCode%3EALC%3C/DeparturePointCode%3E%3CDeparturePointType%3EAIRPORT%3C/DeparturePointType%3E%3CArrivalPointCode%3EBEN%3C/ArrivalPointCode%3E%3CArrivalPointType%3ERESORT%3C/ArrivalPointType%3E%3CSectorType%3ERETURN%3C/SectorType%3E%3CArrDate%3E10.10.10%3C/ArrDate%3E%3CArrTime%3E10:00%3C/ArrTime%3E%3CRetDate%3E17.10.10%3C/RetDate%3E%3CRetTime%3E10:00%3C/RetTime%3E%3CBrochure%3E001%3C/Brochure%3E%3CAdults%3E2%3C/Adults%3E%3CChildren%3E0%3C/Children%3E%3CInfants%3E0%3C/Infants%3E%3CCurrencyCode%3EUKL%3C/CurrencyCode%3E%3C/Request%3E%3C/Availability%3E%3C/TransferOnly%3E%3C/TCOML%3E

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• Compact Framework best practices: Building a GUI

  - by Ciaran

  I'm maintaining a Windows CE app built with the .NET Framework that has about 45 forms. There are 5 'sections' which lead to the function you want. The application is 100% full screen and it is important that it can't be minimized. Since there are so many forms, it's difficult to keep track of which form should be displayed after one is closed. For this, I'm setting the form owner property before showing it, and showing the owner when closing it. I've also been advised that it is best to instantiate all forms when the application loads, and not dispose them to save processing time. I'm not sure about this. My question is, what is the best way to go about showing, hiding forms where you want any 1 form to be in front, full screen all time?

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• Group SQL tables in SQL Server Management Studio object explorer

  - by MainMa

  I have a table which has approximately sixty tables, and other tables are added constantly. Each table is a part of a schema. A such quantity of tables makes it difficult to use Microsoft SQL Server Management Studio 2008. For example, I must scroll up in object explorer to access database related functions, or scroll down each time I need to access Views or Security features. Is it possible to group several tables to be able to expand or collapse them in Object Explorer? Maybe a folder may be displayed for each schema, letting collapse the folders I don't need to use?

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• Best Fit Scheduling Algorithim

  - by Teegijee

  I'm writing a scheduling program with a difficult programming problem. There are several events, each with multiple meeting times. I need to find an arrangement of meeting times such that each schedule contains any given event exactly once, using one of each event's multiple meeting times. Obviously I could use brute force, but that's rarely the best solution. I'm guessing this is a relatively basic computer science problem, which I'll learn about once I am able to start taking computer science classes. In the meantime, I'd prefer any links where I could read up on this, or even just a name I could Google.

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• Verifying the purchaser of an App Store application

  - by Keldi

  Is there a way for the developer of an App Store application to tie a sale to an individual user/device ID/Apple account? In other words, a method for the developer to double-check that a specific user has legally purchased the software? I haven't been able to find a reliable answer to this yet. I'm not looking for specific code examples, just some sort of idea as to how possible (or difficult) this is. My intent isn't to penalize piracy; it's to be able to provide additional benefits to paid customers. As such, I'm not looking for a way to identify a cracked or pirated version, which I gather has already been solved. Thanks in advance for any help you can provide!

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• What is the difference between Java RMI and JMS?

  - by Sanoj

  When designing an distributed application in Java there seams to be a few technologies that address the same kind of problem. I have briefly read about Java Remote Method Invocation and Java Message Service, but it is hard to really see the difference. Java RMI seams to be more tightly coupled than JMS because JMS use asynchronous communication, but otherwise I don't see any big differences. What is the difference between them? Is one of them newer than the other one? Which one is more common/popular in enterprises? What advantages do they have over eachother? When is one preferred over the other? Do they differ much in how difficult they are to implement? I also think that Web Services and CORBA address the same problem.

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• strod() and sprintf() inconsistency under GCC and MSVC

  - by Dmitry Sapelnikov

  I'm working on a cross-platform app for Windows and Mac OS X, and I have a problem with two standard C library functions: strtod() (string-to-double conversion) ? sprintf (when used for outputting double-precision floating point numbers) -- their GCC and MSVC versions return different results. I'm looking for a well-tested cross-platform open-source implementation of those functions, or just for a pair of functions that would correctly and consistently convert double to string and back. I've already tried the clib GCC implementation, but the code is too long and too dependent on other source files, so I expect the adaptation to be difficult. What implementations of string-to-double and double-to-string functions would you recommend?

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• SQL constructs translated to OOP

  - by python dude

  As someone who comes from the world of Object Orientation, I find it rather difficult to wrap my head around SQL. Recently, however, I realized that the classical SQL construct select X from Y where Z is basically equivalent to the following OOP construct: List<SomeType> results = db.query(new Matcher<SomeType> () { public boolean match(SomeType candidate) { return ...; // checks condition Z on candidate, returns true for match } }; So my question is: What are the OOP equivalents for other SQL constructs, such as joins?

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• Debug Mode for CodeIgniter?

  - by nebukadnezzar

  Does CodeIgniter provide a Debug Mode, for example, when accessing an Invalid URL? Ruby on Rails does show debugging Messages when a incorrect URL has been given, and the controller is unable to resolve it using the routes map. How would I enable such debugging messages in CodeIgniter? The profiler ... $this->output->enable_profiler(TRUE); ... only affects single classes, but not all routes. So debugging without an actual debugger mode is a little... difficult. :-)

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• JUnit: 4.8.1 "Could not find class"

  - by Patrick

  Ok, I am like other and new to jUnit and having a difficult time trying to get it working. I have searched the forum but the answers provided; I am just not getting. If anyone out there could lend me a hand I would greatly appreciate it. Let me provide the basics: OS: mac OS X.6 export JUNIT_HOME="/Developer/junit/junit4.8.1" export CVSROOT="/opt/cvsroot" export PATH="/usr/local/bin:/usr/local/sbin:/usr/localmysql/bin:/opt/PalmSDK/Current/bin/:/usr/local/mysql/bin:$PATH:$JUNIT_HOME:$CVSROOT" export CLASSPATH="$CLASSPATH:$JUNIT_HOME/junit-4.8.1.jar:$JUNIT_HOME" I can compile a test class from a java file, however when I try to then run the test java org.junit.runner.JUnitCore MyTest.class I get the following: JUnit version 4.8.1 Could not find class: MyTest.class Time: 0.001 OK (0 tests) Now I have been in the directory with the MyTest.class which is just somewhere in my file system, I tried moving the source folder to the "junit" folder and the "junit/junit4.8.1" folder and the same result. I cannot even run the tests that came with junit. Thanks patrick

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• Multiple join query in eSql

  - by Syma

  Hi guys, This is my first question in stackoverflow but really not the first time to get solution here. I am struggling with multiple join in entity framework 4. I have three tables (Accounts, Users and AccountUsers) that am finding difficult to query. What I want is to get all the users for the provided accountId including the account creator. I can get all the account users with no problem but the hard side for me is getting the account creator since it's not added to AccountUsers table. below is a quick preview how the tables are related. Accounts AccountId UserId (account creator) ...other columns Users UserId ...other columns AccountUsers AccountId UserId I would prefer the query to be esql, but Linq to Entities will do. I trust you guys on stackoverflow, so I know this won't take long to get the 'Answer' mark. Thanks for even reading.

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• How to start recognizing design patterns as you are programming?

  - by Jon Erickson

  I have general academic knowledge of the various design patterns that are discussed in GoF and Head First Design Patterns, but I have a difficult time applying them to the code that I am writing. A goal for me this year is to be able to recognize design patterns that are emerging from the code that I write. Obviously this comes with experience (I have about 2 years in the field), but my question is how can I jumpstart my ability to recognize design patterns as I am coding, maybe a suggestion as to what patterns are easiest to start applying in client-server applications (in my case mainly c# webforms with ms sql db's, but this could definitely be language agnostic).

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