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• Neural Network Basics

  - by Stat Onetwothree

  I'm a computer science student and for this years project, I need to create and apply a Genetic Algorithm to something. I think Neural Networks would be a good thing to apply it to, but I'm having trouble understanding them. I fully understand the concepts but none of the websites out there really explain the following which is blocking my understanding: How the decision is made for how many nodes there are. What the nodes actually represent and do. What part the weights and bias actually play in classification. Could someone please shed some light on this for me? Also, I'd really appreciate it if you have any similar ideas for what I could apply a GA to. Thanks very much! :)

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• Prototype mouseleave for two elements

  - by TenJack

  I have created a small navigation element that is positioned right on top of another element. It is only shown when a user mousenters/mouseovers the main element. I am having some trouble with the prototype. I would like this small nav element to be hidden when a user mouses out of the main box, but I would also like the small nav element to remain visible if a user mouses out of the main box but mouses into the small nav at the same time. This is my attempt so far with some pseudo-code to hopefully explain: $('main_box').observe('mouseenter', function(){ $('small_div').show() }) $('main_box').observe('mouseleave', function(){ if this element is $('small_div') then Event.stop() $('small_div').observe('mouseleave', function(){ if this element is $('main_box') Event.stop observe $('main_box') mouseleave else $('small_div').hide(); }) else $('small_div').hide(); }) The main thing I'm having trouble with is figuring out what element the mouse is over at a given point in time. Is there a way to do something like: on mouseleave do blah unless the mouse is over a specific element then do not do blah?

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• Anyone using ASP.NET MembershipProvider with Nhibernate?

  - by JLago

  Hi, I'm trying to implement Membership controls in a mvc 2 application and i'm having trouble dealing with the MembershipUser class. I have my own data store (in Postgresql) and I'm using Nhibernate to deal with it from C#. The thing is, I have my own user class, but I can't use it with any provider I found that implements Membership, because all the functions return the predefined MembershipUser class and cannot return my own. I'm losing my mind here, is there any way i can work with this, or should I implement everything myself? thanks in advance!

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• What's the most efficient way to format the following string?

  - by Ian P

  I have a very simple question, and I shouldn't be hung up on this, but I am. Haha! I have a string that I receive in the following format(s): 123 123456-753 123455-43 234234-4 123415 The desired output, post formatting, is: 123-455-444 123-455-55 123-455-5 or 123-455 The format is ultimately dependent upon the total number of characters in the original string.. I have several ideas of how to do this, but I keep thing there's a better way than string.Replace and concatenate... Thanks for the suggestions.. Ian

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• Using jQuery to find keywords in string

  - by Nic Hubbard

  In php, I have used preg_match_all() to find keywords (using the format %keyword%) in a string, which works wonderfully and returns an array of all found keywords. What I would like to do, is do the same thing using jQuery or javascript. I have tried using the filter() function, and it kind of works. But I think I am missing something. How can I find ALL instances of the keyword in a string, using a regex? Here is what I have worked out so far: $("[id^='editableContent-']").filter(function() { alert($(this).html().match(/\%(.*?)\%/)); }); Any suggestions are welcome!

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• what's the UNC path for local computer from a remote machine ?

  - by KaluSingh Gabbar

  I am writing a small utility program in IronPython to install applications on remote machine using managementclass which uses WMI. Now, the script would install an application on Machine_B from Machine_A, it works fine as long as you have the msi file on the local drive of the Target machine (Machine_B, in this case). I want to be able to do same thing with .msi file being on the Host (Machine_A) machine. network_scope = r"\\%Machine_B\root\cimv2" scope = ManagementScope(network_scope, options) scope.Connect() mp = ManagementPath("Win32_Product") ogo = ObjectGetOptions() mc = ManagementClass(scope, mp, ogo) inParams = mc.GetMethodParameters ("Install") inParams["PackageLocation"] = r"C:\installs\python-3.1.1.msi" inParams["AllUsers"] = True retVal = mc.InvokeMethod ("Install", inParams, None) print retVal ["ReturnValue"].ToString() PROBLEM : [Machine A] --- Where I am running the script, and want to host the .msi file [Machine B] --- where I want to install the application So, How can I define the UNC path for local machine ? what will be inParams["PackageLocation"] = ??

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• Extracting Information from Images

  - by Khorkrak

  What are some fast and somewhat reliable ways to extract information about images? I've been tinkering with openCV and this seems so far to be the best route plus it has Python bindings. So to be more specific I'd like to determine what I can about what's in an image. So for example the haar face detection and full body detection classifiers are great - now I can tell that most likely there are faces and / or people in the image as well as about how many. okay - what else - how about whether there are any buildings and if so what do they seem to be - huts, office buildings etc? Is there sky visible, grass, trees and so forth. From what I've read about training classifiers to detect objects, it seems like a rather laborious process 10,000 or so wrong images and 5,000 or so correct samples to train a classifier. I'm hoping that there are some decent ones around already instead of having to do this all myself for a bunch of different objects - or is there some other way to go about this sort of thing?

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• keep open windows console after a python syntax error

  - by basweber

  File associations on my machine (winxp home) are such that a python script is directly opened with the python interpreter. If I double click on a python script a console window runs and every thing is fine - as long as there is no syntax error in the script. In that case the console window opens up for a moment but it is closed immediately. Too fast to read the error message. Of course their would be the possibility to manually open a console window and to execute the script by typing python myscript.py but I am sure that there is a more convenient (i.e. "double click based") solution.

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• Oracle transaction read-consistency ?

  - by trojanwarrior3000

  I have problem understanding read consistency in db(oracle). Suppose I am manger of a bank . A customer has got lock (which I dont know) and is doing some updation. Now after he has got lock I am viewing account info of the same customer and try to do some thing on it.But because of read consistency I will see data as it existed before customer got the lock. So will not that affect inputs I am getting and the decisions that I am gonna make during that period?

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• Is there a name for the technique of using base-2 numbers to encode a list of unique options?

  - by Lunatik

  Apologies for the rather vague nature of this question, I've never been taught programming and Google is rather useless to a self-help guy like me in this case as the key words are pretty ambiguous. I am writing a couple of functions that encode and decode a list of options into a Long so they can easily be passed around the application, you know this kind of thing: 1 - Apple 2 - Orange 4 - Banana 8 - Plum etc. In this case the number 11 would represent Apple, Orange & Plum. I've got it working but I see this used all the time so assume there is a common name for the technique, and no doubt all sorts of best practice and clever algorithms that are at the moment just out of my reach.

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• Learning Python coming from PHP

  - by Coronatus

  Community wiki so don't vote to close, kthxbai. My dynamic language experience is solely PHP. I want to learn Python now to broaden my career opportunities and just because I like programming. :) When learning Java, I used a site (lost the URL/real name now), something like "Java for PHP developers" that had all on one side of the page the PHP code, and on the other side the Java code to do the same thing. Is there a website like that for Python? Any other recommendations/advice? Thanks Edit: I have no votes left today, but I'll up-vote good answers tomorrow :)

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• Recompilation problem with groovlets (Groovy)

  - by BasB

  I'm new to Groovy, really like it, but found a compilation problem. I'm using Jetty as a webserver, which is serving .groovy files (groovlets) Consider two files: Test1.groovy which contains:    println new Test2().property Test2.groovy which contains:   public class Test2 {    String property = "print this"  } When calling /Test1.groovy in a browser it prints "print this". But when I change the property in something else, it still prints "print this", it won't recompile. The only thing I can do is restart jetty. Note that when all the code is in one file, recompilation does work. Is there a workaround for this..? Thanks, Bas.

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• Is Windows 7 Home Premium edition sufficient for software development?

  - by Lee Englestone

  Is the Windows 7 Home Premium sufficient for software development? Development would be in Visual Studio 2010. I'm on a budget so would rather purchase 'Home Premium' rather than 'Professional' or 'Ultimate'. The Microsoft site says there is next to nothing functionality wise between them that developers would miss. Can anyone confirm or deny? BTW. Does it come with a version of IIS? I realize that this is not a technical question. But it is important to me and I'm sure other developers wonder the same thing. Cheers, -- Lee

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• How to implement a timer for regular events?

  - by Torben Jonas

  I would like to implement some timers into my application. My goal is to provide an easy way to execute some function every x seconds/minutes so I thought about implementing a 1 sec, 5 sec and 15 seconds timer. The first thing i would like to update every 1 second is the built in clock (don't know if there is any other solution in c#, used this method in c++) Another use would be e.g. a sync function etc. which shall be executed every xx seconds. My question is if there are any useful tutorials on this topic? It is the first time that I would like to implement such an timer system into one of my applications and I do not know if there are any things I have to keep in mind. Thank you in advance for any answer :)

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• Construct a variadic template of unsigned int recursively

  - by Vincent

  I need a tricky thing in a C++ 2011 code. Currently, I have a metafunction of this kind : template<unsigned int N, unsigned int M> static constexpr unsigned int myFunction() This function can generate number based on N and M. I would like to write a metafunction with input N and M, and that will recursively construct a variadic template by decrementing M. For example, by calling this function with M = 3, It will construct a variadic template called List equal to : List... = myFunction<N, 3>, myFunction<N, 2>, myFunction<N, 1>, myFunction<N, 0> How to do that (if it is possible of course) ?

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• Which edition of windows internals should I read?

  - by pecker

  Hello, I want to get into windows driver development. I heard from the community that before diving into driver development one must be familiar with windows internals that means one must read "Windows Internals by Mark Russinovich. I'm going to buy this book today. Which edtition should I buy? 4th edition covers Windows XP & Windows 2003 where as 5th edition covers Windows Vista & windows server 2008. I don't know in driver world how much difference this thing would make. How different are these two editions? should I first read 4th edition & then come to 5th or should I directly dive into 5th?

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• Bitwise operators versus .NET abstractions for bit manipulation in C# prespective

  - by Leron

  I'm trying to get basic skills in working with bits using C#.NET. I posted an example yesterday with a simple problem that needs bit manipulation which led me to the fact that there are two main approaches - using bitwise operators or using .NET abstractions such as BitArray (Please let me know if there are more build-in tools for working with bits other than BitArray in .NET and how to find more info for them if there are?). I understand that bitwise operators work faster but using BitArray is something much more easier for me, but one thing I really try to avoid is learning bad practices. Even though my personal preferences are for the .NET abstraction(s) I want to know which i actually better to learn and use in a real program. Thinking about it I'm tempted to think that .NET abstractions are not that bad at, after all there must be reason to be there and maybe being a beginner it's more natural to learn the abstraction and later on improve my skills with low level operations, but this is just random thoughts.

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• An Actor "queue" ?

  - by synic

  In Java, to write a library that makes requests to a server, I usually implement some sort of dispatcher (not unlike the one found here in the Twitter4J library: http://github.com/yusuke/twitter4j/blob/master/twitter4j-core/src/main/java/twitter4j/internal/async/DispatcherImpl.java) to limit the number of connections, to perform asynchronous tasks, etc. The idea is that N number of threads are created. A "Task" is queued and all threads are notified, and one of the threads, when it's ready, will pop an item from the queue, do the work, and then return to a waiting state. If all the threads are busy working on a Task, then the Task is just queued, and the next available thread will take it. This keeps the max number of connections to N, and allows at most N Tasks to be operating at the same time. I'm wondering what kind of system I can create with Actors that will accomplish the same thing? Is there a way to have N number of Actors, and when a new message is ready, pass it off to an Actor to handle it - and if all Actors are busy, just queue the message?

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• Using jep.invoke() method

  - by hofsoc

  Hi, I need to call a function from a python script and pass in parameters into it. I have a test python script which I can call and run from java using Jepp - this then adds the person. Eg Test.py import Finding from Finding import * f = Finding() f.addFinding("John", "Doe", 27) Within my Finding class I have addFinding(firstname, lastName, age) However, I wish to be able to do this from within java. Should I be using the jep.invoke() method. Does anyone have a hello world example of such a thing being done or forward me to some good examples? Does anyone have any suggestions please? Thanks in advance

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• Looking for Team Development type Software like SVN

  - by SoLoGHoST

  I am in need of a software that is PHP-Based, or similar that can be installed on my server that doesn't offer SVN Perks. It should be somewhat similar to an SVN, however, since the server doesn't support SVN, we'll need another means of doing sort of the same thing. We have a team of Developers and need to accomplish progress in the same way that an SVN does, but without that type of server support. Is there any software that could be installed via webhosting that would be somewhat, if not exactly, similar to an SVN? Please help, Thanks :) P.S. - This is related to development AFAIK, but not exactly code-related.

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• Should Marketing departments have basic HTML skills?

  - by Phil.Wheeler

  Working within an organisation as part of the in-house site development team, a lot of my team's throughput is driven by the colouring-in (marketing) department. It is their responsibility to provide approved content and imagery for the features or enhancements that we include on each iteration of the company site. One thing I've noticed in this job and several previous ones is that the Marketing department is extremely particular about wording and presentation, but has little to no understanding of the actual medium with which they're working - the web. I find that my team is constantly making best guesses for various HTML attributes like image alt text, titles, rel tags, blockquote cite attributes and the like. How reasonable is it to expect that marketing departments have a strong understanding of the purpose of HTML metadata? Should it be the developer's job to remind and inform each time or are marketing departments falling behind the technology they're working with? What could I reasonably expect our marketing department to understand and provide every time with each new work request?

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• What applications is Python optimal for?

  - by Alan

  I'm already a professional J2EE developer by day, and Rails developer by night. I'm planning on adding Python to my list of skills. I'm already convinced a language is just a tool, so I'm not interested in a religious war. I agree with the Pragmatic Programmers that learning one language/year is a good thing for your professional development So, in your considered opinion, what kinds of applications does Python hit the sweet spot? And why? What advantages does it have, and why do these advantages outweigh the costs in adopting Python? ADD: I also plan on learning a pure functional language like Scheme.

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• How can I check a user/password combination on an ActiveDirectory without putting the password in a String?

  - by Jean Hominal

  I want to check User/Password combination on a Windows domain. Right now I do it with the following code: bool Login(String username, String password) { var principalContext = new PrincipalContext(ContextType.Domain); principalContext.ValidateCredentials(username, password); } While it works, the thing that bugs me is that I have to put the password in a String in order to use that API; as I am using a SecureString to store the password everywhere else, I would really like to use some way of checking the username / password combination without having to pass the password as a managed System.String. What would be the best way of achieving that?

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• PHP Linefeeds (\n) Not Working

  - by dosboy

  For some reason I can't use \n to create a linefeed when outputting to a file with PHP. It just writes "\n" to the file. I've tried using "\\n" as well, where it just writes "\n" (as expected). But I can't for the life of me figure out why adding \n to my strings isn't creating new lines. I've also tried \r\n but it just appends "\r\n" to the line in the file. Example: error_log('test\n', 3, 'error.log'); error_log('test2\n', 3, 'error.log'); Outputs: test\ntest2\n Using MAMP on OSX in case that matters (some sort of PHP config thing maybe?). Any suggestions?

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• align WMD editor's preview HTML with server-side HTML validation (e.g. no embedded javascript)

  - by Justin Grant

  There are many SO questions (e.g. here and here) about how to do server-side scrubbing of Markdown produced by the WMD editor to ensure the HTML generated doesn't contain malicious script, like this: <img onload="alert('haha');" src="http://www.google.com/intl/en_ALL/images/srpr/logo1w.png" /> This doesn't affect the WMD client's preview box. I doubt this is a big deal since if you're scrubbing the HTML on the server, an attacker can't save the bad HTML so no one else will be able to see it later and have their cookies stolen or sessions hijacked by the bad script. But it's still kinda odd to allow an attacker to run any script in the context of your site, and it's probably a bad idea to allow the client preview window to allow different HTML than your server will allow. StackOverflow has clearly plugged this hole. How did they do it? [NOTE: I already figured this out but it required some tricky javascript debugging, so I'm answering my own question here to help others who may want to do ths same thing]

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