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• Sum of path products in DAG

  - by Jules

  Suppose we have a DAG with edges labeled with numbers. Define the value of a path as the product of the labels. For each (source,sink)-pair I want to find the sum of the values of all the paths from source to sink. You can do this in polynomial time with dynamic programming, but there are still some choices that can be made in how you decompose the problem. In my case I have one DAG that has to be evaluated repeatedly with different labelings. My question is: for a given DAG, how can we pre-compute a good strategy for computing these values for different labelings repeatedly. It would be nice if there was an algorithm that finds an optimal way, for example a way that minimizes the number of multiplications. But perhaps this is too much to ask, I would be very happy with an algorithm that just gives a good decomposition.

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• Visual Studio web tests: Can a coded webtest be run through the Web Test Editor run view?

  - by Frank Rosario

  Hello, Full disclosure, I'm new to Visual Studio Web Tests and coding for them. I've written a webtest; coded in VB; it runs great. Our QA engineer wants to use this script for performance testing; but he wants the nice GUI that comes when you build a WebTest with the VS WebTest Editor and run it. Is there a way to run a coded webtest through this view? He wants to be able to view each test as it runs to see which pages are having issues, but within the GUI he's used to. Alternatively, I know I could just code something that writes out to a log file; but before I go with that solution; I just wanted to see if this is possible. Any constructive input is greatly appreciated.

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• How to Disable the Move System Menu Item?

  - by Andreas Rejbrand

  In Microsoft Windows, this works: mnu := GetSystemMenu(h, false); EnableMenuItem(mnu, SC_CLOSE, MF_BYCOMMAND or MF_GRAYED); But this does not work: mnu := GetSystemMenu(h, false); EnableMenuItem(mnu, SC_MOVE, MF_BYCOMMAND or MF_GRAYED); Hence I know how to disable the "Close" system menu item of a window, but not the "Move" item. How do I do that? Update Of course one alternative to using the very nice function EnableMenuItem, is to use SetMenuItemInfo: FillChar(info, sizeOf(info), 0); with info do begin cbSize := sizeOf(info); fMask := MIIM_STATE; fState := MFS_GRAYED; end; SetMenuItemInfo(mnu, SC_MOVE, false, info); But this again works perfectly for SC_CLOSE, but not at all for SC_MOVE!

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• How can I dynamically add an <object> tag with JavaScript in IE?

  - by Detlef D. Doerscheln

  I have to add either an embed tag for Firefox or an object tag for Internet Explorer with JavaScript to address the appropriate ActiveX / Plugin depending on the browser. The plugin could be missing and needs to get downloaded in this case. The dynamically added embed tag for Firefox works as expected. The dynamically added object tag for Internet Explorer seems to do nothing at all. The object tag needs the following attributes to function properly. id ="SomeId" classid = "CLSID:{GUID}" codebase = "http://www.MyActicexSource.com/MyCuteActivex.CAB#Version=2,0,0,1" Even a general working idea or method would be nice. Thanks!

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• Redmine connecting to SVN through SSL

  - by Pekka

  I am having trouble connecting Redmine to a locally hosted subversion repository using SSL. I suspect it's the self-signed certificate that usually triggers a warning in the SVN client and browser. When I try to connect to the local repo through SSL in Redmine, I get a red "Revision not available" error. When I try connecting through svn://, the connection times out, and I have to restart the web server. Connecting without SSL works without problems. It would be nice to run subversion on SSL to make it safely accessible from the outside as well. I could run the repository through plain HTTP but would like SSL for outside communication. As far as I understand, subversion can't be run both ways at the same time. Does anybody know what to do in such a situation? Is there a configuration setting to ignore invalid certificates somewhere?

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• url rewriting asp .htaccess file

  - by GigaPr

  I i just moved my website (asp.net) to the live environment. i realized they are running IIS 6 so all my nice and clean url rewriting doesn t work anymore. i was trying to implemente url rewriting using the .htaccess file i want to rewrite www.amicobio.co.uk/Menu.aspx as www.amicobio.co.uk/Food-Menu so in the .htaccess i set CaseInsensitive On Options +FollowSymlinks RewriteEngine On RewriteRule ^Food-Menu$ Menu.aspx but it doesn t work it says The requested URL /a/m/amicobio.co.uk/public/Menu.aspx was not found on this server. obviously yhe path is wrong but what is /a/m/ ? and how do i fix it? all the files in amicobio.co.uk/public/ thanks

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• Checking Drupal authentication from external PHP

  - by peppergrower

  This may well be simple, but I'm new to Drupal. The organization I work for switched to Drupal a little while ago, but there's still some legacy code in various external PHP files that would be cumbersome to convert over to work within Drupal. However, it would be very nice to be able to restrict access to some of these pages based on a person being authenticated against Drupal. (Some pages are administrative and are currently visible to anyone who knows the URL, for instance. Yes, poor design, but that's what I inherited...) How can I check with Drupal, from an external PHP file, to see if the person visiting a given page has authenticated?

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• C#: Put member variables into a list.

  - by David

  Hi all Assuming I have a method which accepts an IList or similar thing as a parameter: public void JiggleMyList(IList<string> list)... Is there an easy way that I can pass in string members of a list of objects? I mean, if for example, I have a list of Person objects which expose a string property called FullName, is there a quick way to stuff the FullNames of all the Person objects into the method parameter, or do I have to create a new List and iterate through the Person objects: List<string> fullNames = new List<string>; foreach (Person person in people) { fullNames.Add(person.FullName); } JiggleMyList(fullNames); I come across this all the time, and it would be nice if there was a shortcut. Many thanks David

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• What to name an array of flags?

  - by Chris

  I have a project where lots of the objects hold state by maintaining simple boolean flags. There are lots of these, so I maintain them within a uint32_t and use bit masking. There are now so many flags to keep track of, I've created an abstraction for them (just a class wrapping the uint32_t) with set(), clear(), etc. My question: What's a nice accurate, concise name for this class? What name could I give this class so that you'd have a reasonable idea what it was [for] knowing the name only? Some ideas I had: FlagBank FlagArray etc Any ideas? Thanks in advance! Cheers, -Chris

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• In C# should I use uint or int for values that are never supposed to be negative?

  - by Hamish Grubijan

  Suppose that the MaxValue of (roughly :) ) 2^31 vs 2^32 does not matter. On one hand, using uint seems nice because it is self-explanatory, it indicates (and promises?) that some value may never be negative. However, int is more common, and a cast is often inconvenient. One can just use int and always supplement it with code contracts (everyone has moved to .Net 4.0 by now, right?) Standard libraries do use int for Length and Size properties, even though those should never be negative. So, is it obvious to you that int is better than uint most of the time, or is it more complicated? Please ask questions if you find that this question is not clearly stated. Thanks.

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• ASP.NET MVC IoC usability

  - by Andrew Florko

  Hello everybody, How often do you use IoC for controllers/DAL in real projects? IoC allows to abstract application from concrete implementation with additional layer of interfaces that should be implemented. But how often concrete implementation changes? Should we really have to do job twice adding method to interface then the implementation if implementation hardly will ever be changed? I took part in about 10 asp.net projects and DAL (ORM-like and not) was never rewritten completely. Watching lots of videos I clearly understand that IoC "is cool" and the really nice way to program, but does it really needed?

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• How do I keep the shape of an UIELement while doing a Drag and Drop in WPF

  - by Kamikaze

  Hi all!I'll give an example of what I intend to do: I have 2 StackPanels one containing an Ellipse the other one containing nothing; I want to drag the Ellipse from one stack panel to the other . The actual drag & drop is already done and works fine. However I'd like to know how to keep that that Ellipse shape at the tip of my mouse cursor (I've been searching all day and couldn't find anything that helps ) Even an windows forms example would be nice , I'll be able to adapt it :). Thanks for the help!

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• Complex Django filter question

  - by HWM-Rocker

  Lets say I have this class (simplified): class Tag (...): children = models.ManyToManyField(null=True, symmetrical=False) Now I already implemented the functions get_parents, get_all_ancestors. Is there a nice pythonic way to just the top level tags? If I had designed my Tags differently (to point to the parents instead) I would just make get_all_parents().filter(children=null). My first thought is to create a new function that will go recursively through all parents and save those that has none. But is there a possibility with filters or Query-objects to do the same (with fewer lines of code)? Thanks for your help. [edit] When it is finished, it should be a hierarchical tagging system. Each tag can have children, parents, but only the children are saved. I want to get all the top level tags, that point through many children / childrens children to my tag.

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• Clear command line output from Python [Eclipse]

  - by Tomas Lycken

  I'm using Eclipse for writing Python, and I want to be able to easily clear the screen. I've seen this question, and tried (among other things suggested there) the following solution import os def clear(): os.system('cls' if os.name == 'nt' else 'clear') but it doesn't entirely solve my problem. Instead of clearing the screen, the routine prints a small square (as if wanting to print an unknown character) to the command output window in Eclipse. Typing cls in the command line works perfectly fine, as does running a Python script with the above code from command line. But how can I make it look nice in Eclipse as well?

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• make website page get news articles from feeds

  - by Andy

  Hi, I would like to start publishing some news articles from time to time. An option would be to create a new web page for every article but this sounds like it can be done easier. For instance I noticed clear channel uses some kind of feed, like: http://www.z100.com/cc-common/news/sections/newsarticle.html?feed=104650&article=7011404 I don't know what it means and how it works but looks like a nice way to get the article from some kind of database I guess? Does someone knows how this works, or some other way to create new articles etc, some dynamical functionality for instance to generate links to the articles and get the right article from a database for example. thanks!

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• What are some good algorithms for drawing lines between graph nodes?

  - by ApplePieIsGood

  What I'm specifically grappling with is not just the layout of a graph, but when a user selects a graph node and starts to drag it around the screen area, the line has to constantly be redrawn to reflect what it would look like if the user were to release the node. I suppose this is part of the layout algorithm? Also some applications get a bit fancy and don't simply draw the line in a nice curvy way, but also bend the line around the square shaped node in almost right angles. See attached image and keep in mind that as a node is dragged, the line is drawn as marching ants, and re-arranged nicely, while retaining its curved style.

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• Advice needed: What tech expertise do I need to accomplish my goal?

  - by quaternion

  I have a business plan & money to hire a developer - the essentials involve simple online games for children (played via traditional computer over the internet) such that their scores are uploaded to a database that can be viewed via a nice portal. What I don't know is: what technologies I would want my developer to know (the only somewhat unusual requirement I have is that the games have relatively accurate timing of keypresses/mouse presses) how much I should expect to pay (in general, what is the appropriate range) how many hours a program of the complexity of a simple tower defense -type game should take to develop (to be clear, the idea is not to implement TD, but rather other games of similar complexity) whether I should go with capable acquaintances, some online kind of online web-dev bidding site, or just try to find a capable undergraduate at the local university who I can wow with his/her first big paycheck, how I should communicate the software's specifications to my hired developer... Is there a standard I should be using? whether I should hire a webdev consultant for a few hours to help me answer these questions, instead of asking stackoverflow Thanks for any advice!

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• How to convert an arbitrary object to String with JSTL? (calling toString())

  - by hstoerr

  Is there any way to call toString() on an object with the JSTL? (I need the String representation of an enum as index in a map in a JSP EL expression.) I hoped something like ${''+object} would work like in java, but JSTL isn't that nice, and there does not seem to be any function that does it. Clarification: I have a variable somemap that maps Strings to Strings, and I have a variable someenum that is an enumeration. I'd like to do something like ${somemap[someenum.toString()]}. (Of course .toString() does not work, but what does?)

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• image processing toolbox in matlab

  - by yasuhiro89

  I've got a specific question and a related more general one... Why does imextendedmax() not give for example 9 in A(3,3) as a max? Generally... what is the best way for finding multiple maxes/peaks? The nice thing about imextended max is it allows a threshold where presumably everything under that threshold is not counted whereas imregionalmax and findpeaks are more general, less effective. A=round(rand(5)*10) A = 1 5 4 8 3 5 1 8 8 3 9 3 9 1 2 9 7 3 5 9 6 3 5 6 8 B=imextendedmax(A,8) B = 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

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• Software to find dependencys in a database that not have them as restrictions

  - by Tomas Friden

  I have a database in SQL server 2005 that originaly comes fom an old mainframe. All relations was set in the surrounding software and there are non i the database. I need to find the relations, not by field name but by actual contence in the registers. (as suggestions, I realize I'l have to check them up) It would be nice with some extras, like finding motherless posts etc. but not a primary demand. There are some 200 registers with max 2 000 000 posts in any register. Does any one know of a software that can help me with this? The software I can find presuposes that relations are set in the database :(

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• SQL Server: Check if table exists

  - by Vincent

  I would like this to be the ultimate discussion on how to check if a table exists in SQL Server 2000/2005 using SQL Statement. When you Google for the answer, you get so many different answers. Is there an official/backward & forward compatible way of doing it? Here are two ways to start discussion: IF EXISTS (SELECT 1 FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE='BASE TABLE' AND TABLE_NAME='mytablename') SELECT 1 AS res ELSE SELECT 0 AS res; IF OBJECT_ID (N'".$table_name."', N'U') IS NOT NULL SELECT 1 AS res ELSE SELECT 0 AS res; MySQL provides a nice SHOW TABLES LIKE '%tablename%'; statement. I am looking for something similar.

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• Icons in Windows Form Applications (VS2008)

  - by typoknig

  This is yet another question about .ico files. I have read through many pages trying to figure this out but I am unable to. When I go to Properties - Application of my Windows Form Application there is a place for me to pick the icon for my application. I have made a 32x32 icon and it takes it just fine, but the image is grainy when it is applied to my .exe file, like it is a picture that has been expanded more than it should have. 1.) Why is this? 2.) Is there any .ico file size other than 32x32 than a Windows Form Application can accept? I have tried 48x48 but it doesn't like that. I just want my .exe file to look nice!

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• Prevent users from being able to access a webpage via web browser?

  - by Rob

  My friend and I are working on a program. This program is going to submit GET data to our webpage. However, we don't want users accessing the webpage any other way than the program. We can prevent users from sharing the program using HWID authentication, but nothing prevents them from using a packet scanner to get the URL of the webpage. We thought about user-agent authentication, which we will implement, but user-agents can easily be spoofed. So my question is, how can we prevent users from accessing the webpage directly, instead of through the program? Even if you don't have an answer that will completely work, anything that will help deter them would be nice. Currently we will be implementing: HWID Authentication to use the program User-Agent Authentication to access the web page Instant IP Blacklisting to anyone accessing the webpage without the proper User-Agent

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• Routing classic asp and through an MVC application

  - by Matthias

  We are starting to convert a large classic asp application into MVC (using C#). An additional requirement is, that all classic routes get "translated" to MVC ones ('mydomain.com/productdetail.asp?id=13' should become 'mydomain.com/products/13') even before we start writing the first controller or view. So basically, we want to use the routing from MVC but have the classic asp handle the response. An these are my questions: How to use the new nice urls but have the classic asp handle the construction of the html result? Within the classic asp page, the new MVC url pattern should be used for links. What is the best way of translating the old urls to the new ones and make the accessible within the classic asp site (using COM I guess). When an old/classic url is requested, how would I correctly handle that request so that browsers/searchengines would understand that the page has moved to the new url? Thanks in advance!

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• Streaming audio - where to start?

  - by Adam Davis

  I need to develop an embedded audio streaming server. Requirements: Voice quality or better Intended for low power wifi transmission Broad support in existing software and devices (ie, windows media player, quicktime, vlc, iPhone, Android, etc). Royalty/patent free, or cheap to license Preferences: Low overhead TCP/IP based streaming protocol Voice grade codec (easy to implement in software, no DSP, 32bit CPU if needed) Would be nice if it supported HTML5 browsers, but is there any codec (such as raw) that is supported by the latest browsers that is lower overhead than MP3? Therefore: What are the relevant streaming protocols I should be looking at? What are the relevant codecs I should be looking at? What transport streams should I be looking at? What am I missing, or where else should I be looking for this type of need?

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