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• Looking for evolutionary music example code

  - by Dan Dyer

  I would like to implement an interactive evolutionary algorithm for generating music (probably just simple melodies to start with). I'd like to use JFugue for this. Its website claims that it is well-suited to evolutionary music, but I can't find any evolutionary examples. I already have a framework to provide the evolutonary machinery. What I am looking for is some simple, working code that demonstrates viable approaches for the musical part (e.g. suitable encodings and evolutionary operators for the evolved tunes). I have some ideas how it might be achieved, but I'm not particularly knowledgeable about music theory, so to start with I'd like to just reimplement something that is known to work. So does anybody have, or know of, any freely available code (any language is fine) that demonstrates one or more approaches to evolutionary music? EDIT: I'm specifically looking for evolutionary code rather than other techniques that could be used for music synthesis.

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• Implementing arrays using a stack

  - by Zack

  My programming language has no arrays, no lists, no pointers, no eval and no variable variables. All it has: Ordinary variables like you know them from most programming languages: They all have an exact name and a value. One stack. Functions provided are: push (add element to top), pop (remove element from top, get value) and empty (check if stack is empty) My language is turing-complete. (Basic arithmetics, conditional jumps, etc implemented) That means, it must be possible to implement some sort of list or array, right? But I have no idea how... What I want to achieve: Create a function which can retrieve and/or change an element x of the stack. I could easily add this function in the implementation of my language, in the interpreter, but I want to do it in my programming language. "Solution" one (Accessing an element x, counting from the stack top) Create a loop. Pop off the element from the stack top x times. The last element popped of is element number x. I end up with a destroyed stack. Solution two: Do the same as above, but store all popped off values in a second stack. Then you could move all elements back after you are done. But you know what? I don't have a second stack!

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• PushViewController after presentModalViewController like in Apples Alarm Clock app

  - by Fabian

  Hello together, my Question is quite simple. I have an add-button. When I tap on it -- presentmodelviewController presents a UIViewController, which contains a simple Table with cells. When I tap on a Cell, i want to display a new View using pushViewController, which automatically creates a "back Button". At the top of it in this new View i have a Textfield, where I can enter some Text. When I tap the back-button, the view slides back to the add-View (which was presented using modalView...). Now i want the text edited in the view before to be placed in the Label of the first row (cell) on which I tapped. So I want to do this for 5 cells. Each of them presenting another xib. Please, can anyone help? Thanks for your helpful replies.

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• Junit: splitting integration test and Unit tests.

  - by jeff porter

  Hello all, I've inherited a load of Junit test, but these tests (apart from most not working) are a mixture of actual unit test and integration tests (requiring external systems, db etc). So I'm trying to think of a way to actually separate them out, so that I can run the unit test nice and quickly and the integration tests after that. The options are.. 1: Split them into separate directories. 2: Move to Junit4 and annotate the classes to separate them. 3: Use a file naming convention to tell what a class is , i.e. AdapterATest and AdapterAIntergrationTest. 3 has the issue that Eclipse has the option to "Run all tests in the selected project/package or folder". So it would make it very hard to just run the integration tests. 2: runs the risk that developers might start writing integration tests in unit test classes and it just gets messy. 1: Seems like the neatest solution, but my gut says there must be a better solution out there. So that is my question, how do you lot break apart integration tests and proper unit tests?

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• How to change default image of derived ToolStripButton?

  - by Special Touch

  It seems like a simple task. Create a C# class that derives from ToolStripButton. The derived ToolStripButton should behave exactly the same as the parent class in the designer and the application, except that the default image should be different. Surprisingly just changing the constructor is not sufficient: public CustomToolStripButton() { base.Image = (Image) new Bitmap(typeof(CustomToolStripButton), "CustomImage.bmp"); } When the ToolStripButton is displayed in the designer, the original default image is shown. There must be a simple solution. What could it be?

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• Source Control - XCode - Visual Studio 2005/2008 / 2010

  - by Mick Walker

  My apologies if this has been asked before, I wasnt quite sure if this question should be asked on a programming forum, as it more relates to programming environment than a particular technology, so please accept my (double) appologies if I am posting this in the wrong place, my logic in this case was if it effects the code I write, then this is the place for it. At home, I do a lot of my development on a Mac Pro, I do development for the Mac, iPhone and Windows on this machine (Xcode & Visual Studio - (multiple versions installed in bootcamp, but generally I run it via Parallels)). When visiting a client, I have a similar setup, but on my MacBook Pro. What I want is a source control solution to install on the Mac Pro, that will support both XCode and multiple versions of visual studio, so that when I visit a client, I can simply grab the latest copy from source control via the MacBook Pro. Whilst visiting the client, he / she may suggest changes, and minor ones I would tend to make on site, so I need the ability to merge any modified code back into the trunk of the project / solution when I return home. At the moment, I am using no source control at all, and rely on simply coping folders and overwriting them when I return from a client- thats my 'merge'!!! I was wondering if anyone had any ideas of a source provider I could use, which would support both Windows and Mac development environments, and is cheap (free would be better).

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• How can I disable the CTRL-ALT-DEL key combination completely on XP/Vista/7?

  - by Travesty3

  I have been googling extensively to figure this out, and nobody seems to be able to give a direct answer. Let me start by saying that I'm NOT talking about requiring CTRL-ALT-DEL to enter logon information. I'm working on a golf simulator program which is used at golf centers. I need the ability to completely disable the CTRL-ALT-DEL key sequence so that the golf center customers can't get out of the program and access the computer at all. I realize there are other key combinations that need to be handled as well, we already have this entire feature working in XP, but we're going to be switching to Windows 7 soon, and CTRL-ALT-DEL is the only one that doesn't seem to work in Win7. I'd really like an all-around solution if at all possible. This same program may also be installed on a client's personal computer for an in-home golf simulator, but the computers that really need this feature (golf center computers) are provided to the golf center by us, so would the best option be to write a new shell? I don't know anything about that at all, other than others that suggest writing a new shell for kiosk mode. I'd really like a simpler option, like modifying the registry in some way. I have heard that you can remove some buttons from the menu screen that pops up, but unless I can remove pretty much all of them (including the shutdown/restart button in the bottom-right corner), this won't be enough of a solution for me. Thanks for taking the time to read this and thanks again for any help you could provide! -Travis

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• Versioning friendly, extendible binary file format

  - by Bas Bossink

  In the project I'm currently working on there is a need to save a sizable data structure to disk (edit: think dozens of MB's). Being an optimist, I thought that there must be a standard solution for such a problem; however, up to now I haven't found a solution that satisfies the following requirements: .NET 2.0 support, preferably with a FOSS implementation Version friendly (this should be interpreted as: reading an old version of the format should be relatively simple if the changes in the underlying data structure are simple, say adding/dropping fields) Ability to do some form of random access where part of the data can be extended after initial creation (think of this as extending intermediate results) Space and time efficient (XML has been excluded as option given this requirement) Options considered so far: Protocol Buffers: was turned down by verdict of the documentation about Large Data Sets - since this comment suggested adding another layer on top, this would call for additional complexity which I wish to have handled by the file format itself. HDF5,EXI: do not seem to have .net implementations SQLite/SQL Server Compact edition: the data structure at hand would result in a pretty complex table structure that seems too heavyweight for the intended use BSON: does not appear to support requirement 3. Fast Infoset: only seems to have paid .NET implementations. Any recommendations or pointers are greatly appreciated. Furthermore if you believe any of the information above is not true, please provide pointers/examples to prove me wrong.

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• javascript hide/unhide, but want an arrow to point down/up on hide/unhide

  - by user1305810

  I have a simple hide/unhide div section using simple JavaScript. I need to have an arrow image, which will toggle the content visibility when clicked, and I want the little arrow to toggle between right/down positions when the content is hidden and unhidden. HTML content: <a href="javascript:showOrHide();"><img src="Image_Files/Copyright.png" alt="BioProtege Inc" border="0" /></a> <img src="Image_Files/Copyright_Arrow_Hidden.png" alt="Arrow" border="0" /> <div id="showorhide"> Copyright 2012+ BioProtege-Inc.Net | LG Fresh Designz <br /> Contact Us @ [email protected] </div> JavaScript content: function showOrHide() { var div = document.getElementById("showorhide"); if (div.style.display == "block") { div.style.display = "none"; } else { div.style.display = "block"; } }

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• How do I get the User Entered Value in AjaxControlToolkit ComboBox when the enter key is pressed?

  - by Jason

  The Problem: The user entered value is missing in the .Text attribute of the AjaxControlToolkit ComboBox when the enter key pressed. Also the “on change” events events are not called but I am not using postbacks anyway so I do not care. Example: private void BuildFileListDetails(NHibernateDataProvider _providerM) { int resultsPage = Convert.ToInt32(ddlNavPageNumber.Text); const int RESULTS_PAGE_SIZE = 100; // The cbFileName.Text equals "" Not what user entered string searchFileName= cbFileName.Text; var xrfFiles = _providerM.GetXrfFiles(searchFileName, resultsPage, RESULTS_PAGE_SIZE); gvXrfFileList.DataSource = xrfFiles; gvXrfFileList.DataBind(); } My Solution: I needed to access the AjaxToolkit "ComboBox" imbedded TextBox control's .Text to access the value entered by user. private void BuildFileListDetails(NHibernateDataProvider _providerM) { int resultsPage = Convert.ToInt32(ddlNavPageNumber.Text); const int RESULTS_PAGE_SIZE = 100; string searchFileName; //The Solution: Access the AjaxToolkit "ComboBox" imbedded TextBox control's .Text to access the value entered by user. TextBox textBox = cbFileName.FindControl("TextBox") as TextBox; if (textBox != null) { searchFileName = textBox.Text; //textBox.Text = "User Entered Value" } else { searchFileName = cbFileName.Text; } var xrfFiles = _providerM.GetXrfFiles(searchFileName, resultsPage, RESULTS_PAGE_SIZE); gvXrfFileList.DataSource = xrfFiles; gvXrfFileList.DataBind(); }

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• How to use Castle Windsor with ASP.Net web forms?

  - by Xian

  I am trying to wire up dependency injection with Windsor to standard asp.net web forms. I think I have achieved this using a HttpModule and a CustomAttribute (code shown below), although the solution seems a little clunky and was wondering if there is a better supported solution out of the box with Windsor? There are several files all shown together here // index.aspx.cs public partial class IndexPage : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { Logger.Write("page loading"); } [Inject] public ILogger Logger { get; set; } } // WindsorHttpModule.cs public class WindsorHttpModule : IHttpModule { private HttpApplication _application; private IoCProvider _iocProvider; public void Init(HttpApplication context) { _application = context; _iocProvider = context as IoCProvider; if(_iocProvider == null) { throw new InvalidOperationException("Application must implement IoCProvider"); } _application.PreRequestHandlerExecute += InitiateWindsor; } private void InitiateWindsor(object sender, System.EventArgs e) { Page currentPage = _application.Context.CurrentHandler as Page; if(currentPage != null) { InjectPropertiesOn(currentPage); currentPage.InitComplete += delegate { InjectUserControls(currentPage); }; } } private void InjectUserControls(Control parent) { if(parent.Controls != null) { foreach (Control control in parent.Controls) { if(control is UserControl) { InjectPropertiesOn(control); } InjectUserControls(control); } } } private void InjectPropertiesOn(object currentPage) { PropertyInfo[] properties = currentPage.GetType().GetProperties(); foreach(PropertyInfo property in properties) { object[] attributes = property.GetCustomAttributes(typeof (InjectAttribute), false); if(attributes != null && attributes.Length > 0) { object valueToInject = _iocProvider.Container.Resolve(property.PropertyType); property.SetValue(currentPage, valueToInject, null); } } } } // Global.asax.cs public class Global : System.Web.HttpApplication, IoCProvider { private IWindsorContainer _container; public override void Init() { base.Init(); InitializeIoC(); } private void InitializeIoC() { _container = new WindsorContainer(); _container.AddComponent<ILogger, Logger>(); } public IWindsorContainer Container { get { return _container; } } } public interface IoCProvider { IWindsorContainer Container { get; } }

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• IRC Server configuration possibilities

  - by Katai

  I need to know a couple of things, concerning IRC servers that I couldnt directly find out over google (or werent clear enough for me to be sure if it actually works) I'm working at a larger community site, and wanted to deliver an in-page chat. Since it would be a nice feature to let people access it from outside too, over their own clients, I tought implementing an IRC Server would be the best solution (probably dedicated, I'll have to teach myself a couple of things for that) I plan to include a Web-based IRC client over an APE Client / Server. The problem is, I want to strip down the user rights, to disallow many functionalities that IRC would offer: Change of nicknames: The user logs in over the Page login, and I'll automatically create an IRC auth for this user with that password. So basically, he would connect to the IRC client over a button. And after connecting, he shouldnt be able to change his nickname at all Creating channels: I want the possibility to create channels, but not from 'normal' users. Basically, I would prefer to set up basic channels that are public, and if a user really creates an own channel, that one should be private and via invitation (is that possible?) Private conversations: private conversations should be filtered out from the allaround IRC client, into separate 'in-browser-windows' that I create over JS. I guess I just have to filter the stuff coming from IRC - or is there a better solution to that? Only 'registered' users have access: Like I said, if someone registers on the page, I would like to create an IRC 'account' for him. Users that arent registered on the page, cant access the IRC server at all (or get thrown out). Mainly to avoid spammers or bots from outside. Is this stuff solvable over IRC? I've read some FAQ's and Instructions for IRC OP's and servers, but I couldnt find a clear answer - it seems that everyone can do pretty much everything - I would like to configure it in a way that user possibilities are more cut down. Basically, giving users the possibility to chat, but not more. So the Question basically is, how possible / solvable this issues are allaround, or if I have to find other solutions for this.

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• How can I reduce build time using a parallel build / parallelizing the tests?

  - by Alex Baranosky

  SImple question :) How can I reduce build time using a parallel build / parallelizing the tests?

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• Porting a piece of Lisp code to Clojure (PAIP)

  - by Robert Brown

  I'm reading Paradigms of Artificial Intelligence Programming (PAIP) by Peter Norvig and I'm trying to write all the code in Clojure rather than common Lisp. However I'm stuck on this piece of code on page 39: (defparameter *simple-grammar* '((sentence -> (noun-phrase verb-phrase)) (noun-phrase -> (Article Noun)) (verb-phrase -> (Verb noun-phrase)) (Article -> the a) (Noun -> man ball woman table) (Verb -> hit took saw liked)) "A grammar for a trivial subset of English.") (defvar *grammar* *simple-grammar*) How can I translate this into Clojure? Thanks.

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• LinqToSql - ChangeConflictException. when submiting child and parent

  - by ari

  This problem drives me crazy. Here's the code using (BizNetDB db = new BizNetDB()) { var dbServiceCall = db.ServiceCalls.SingleOrDefault(x => x.ServiceCallID == serviceCallDetail.ServiceCallID); var dbServiceCallDetail = dbServiceCall.ServiceCallDetaills.SingleOrDefault(x=> x.ServiceCallDetailID == serviceCallDetail.ServiceCallDetailID); if (dbServiceCallDetail == null) { dbServiceCallDetail = new Data.ServiceCallDetaill(); dbServiceCall.ServiceCallDetaills.Add(dbServiceCallDetail); } dbServiceCallDetail.EndSession = serviceCallDetail.EndSession; dbServiceCallDetail.ExitTime = serviceCallDetail.ExitTime; dbServiceCallDetail.Solution = serviceCallDetail.Solution; dbServiceCallDetail.StartSession = serviceCallDetail.StartSession; serviceCallDetail.SessionMinutes = (serviceCallDetail.EndSession - serviceCallDetail.StartSession).Minutes; serviceCallDetail.DriveMinutes = serviceCallDetail.ExitTime.HasValue ? (serviceCallDetail.StartSession - serviceCallDetail.ExitTime.Value).Minutes : 0; var totalMinutes = (from d in db.ServiceCallDetaills .Where(x => x.ServiceCallID == serviceCallDetail.ServiceCallID && x.ServiceCallDetailID != dbServiceCallDetail.ServiceCallDetailID) group d by d.ServiceCallID into g select new { SessionMinutes = g.Sum(x => x.SessionMinutes), DriveMinutes = g.Sum(x => x.DriveMinutes) }).First(); dbServiceCall.SessionMinutes = totalMinutes.SessionMinutes + serviceCallDetail.SessionMinutes; dbServiceCall.DriveMinutes = totalMinutes.DriveMinutes + serviceCallDetail.DriveMinutes; try { db.SubmitChanges(); } catch (ChangeConflictException ex) { db.ChangeConflicts.ResolveAll(RefreshMode.OverwriteCurrentValues); db.SubmitChanges(); } The second Submit did solve the problem.. but I want to solve it from the root! when I disabled this lines (The parent changes): dbServiceCall.SessionMinutes = totalMinutes.SessionMinutes + serviceCallDetail.SessionMinutes; dbServiceCall.DriveMinutes = totalMinutes.DriveMinutes + serviceCallDetail.DriveMinutes; everithing is Ok. please help...

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• Mathematical annotations in a PDF file

  - by kvaruni

  I like to annotate papers I read in a digital way. Numerous programs exist to help in this process. For example, on OS X one can use programs such as Skim or even Preview. However, making annotations is dreadful when one wishes to add mathematical annotations, such as formulas or greek letters. A cumbersome "solution" is to select the desired symbol one by one using the Special Characters palette, though this considerably slows down the annotation process. Is there any way to add mathematical annotations to a PDF? The only two limitations that I would impose on a solution is that 1) the mathematical text needs to be selectable, i.e. it must be text and 2) I want to limit the number of programs I need to make the process as painless as possible. Some of the more promising solutions I have tried include generating LaTeX with LaTeXiT, but it seems to be impossible to add a PDF on top of another PDF. Another attempt was to use jsMath to generate the symbols and copy-paste these as annotation using one of the jsMath fonts. This results in unreadable, incorrect characters.

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• How do I reset the scale/zoom of a web app on an orientation change on the iPhone?

  - by Elisabeth

  I'm having the same problem that a couple of others have had with getting the correct behavior in a web app on an orientation change, and there doesn't seem to be an obvious solution - I've seen this question asked a couple of times on Stack Overflow and no one's yet been able to answer it. When I start the app in portrait mode, it works fine. Then I rotate into landscape and it's scaled up. To get it to scale correctly for the landscape mode I have to double tap on something twice, first to zoom all the way in (the normal double tap behavior) and again to zoom all the way out (again, the normal double tap behavior). When it zooms out, it zooms out to the correct NEW scale for landscape mode. Switching back to portrait seems to work more consistently; that is, it handles the zoom so that the scale is correct when the orientation changes back to portrait. I am trying to figure out if this is a bug? or if this is something that can be fixed with Javascript? With the viewport meta content, I am setting the initial-scale to 1.0 and I am NOT setting minimum or maximum scale (nor do I want to). I am setting the width to device-width. Any ideas? I know a lot of people would be grateful to have a solution as it seems to be a persistent problem. Thank you!

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• Javascript Detect Control Key Held on Mouseup

  - by Michael Mikowski

  I've searched a good deal, and can't seem to find a satisfactory solution. I hope someone can help. While I am using jQuery, I am also writing many thousands of lines of Javascript. So a "pure" javascript solution is just fine. I'm trying to determine if the control key is physically held down on a mouseup event. That's it; there are no other preconditions. Does anyone know how to do this reliably, cross-browser? I've tried storing this in a state variable by noting when the key is pressed and released: // BEGIN store control key status in hash_state $().bind('keydown','ctrl',function( arg_obj_e ){ hash_state.sw_ctrldn = true; console.debug( hash_state.sw_ctrldn ); }); $().bind('keyup','ctrl',function( arg_obj_e ){ hash_state.sw_ctrldn = false; console.debug( hash_state.sw_ctrldn ); }); // END store control key status in hash_state However, this really doesn't work. If you test this using firebug and watch the console, you will see that auto-repeat seems to happen, and the value toggles. I inspected the mouseup event to see if there is anything useful there, but to no avail: var debugEvent = function( arg_obj_e ){ var str = ''; for ( var attr in arg_obj_e ){ str += attr + ': ' + arg_obj_e[attr] + '\n'; } console.debug(str); } Any help would be appreciated.

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• Generating all unique combinations for "drive ya nuts" puzzle

  - by Yuval A

  A while back I wrote a simple python program to brute-force the single solution for the drive ya nuts puzzle. The puzzle consists of 7 hexagons with the numbers 1-6 on them, and all pieces must be aligned so that each number is adjacent to the same number on the next piece. The puzzle has ~1.4G non-unique possibilities: you have 7! options to sort the pieces by order (for example, center=0, top=1, continuing in clockwise order...). After you sorted the pieces, you can rotate each piece in 6 ways (each piece is a hexagon), so you get 6**7 possible rotations for a given permutation of the 7 pieces. Totalling: 7!*(6**7)=~1.4G possibilities. The following python code generates these possible solutions: def rotations(p): for i in range(len(p)): yield p[i:] + p[:i] def permutations(l): if len(l)<=1: yield l else: for perm in permutations(l[1:]): for i in range(len(perm)+1): yield perm[:i] + l[0:1] + perm[i:] def constructs(l): for p in permutations(l): for c in product(*(rotations(x) for x in p)): yield c However, note that the puzzle has only ~0.2G unique possible solutions, as you must divide the total number of possibilities by 6 since each possible solution is equivalent to 5 other solutions (simply rotate the entire puzzle by 1/6 a turn). Is there a better way to generate only the unique possibilities for this puzzle?

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• InstallUtil Publishing WMI Schema to 64 Bit Directory Instead of 32 Bit Directory

  - by Nick

  This is similar to this question, but it doesn't look like a good solution was ever determined, so I'm opening a new one with clarified details. We wrote a .NET service, which among other things, publishes some of the class hierarchy using WMI. On a 64-Bit machine, we are running the 32-bit version of InstallUtil to install the service. It installs successfully, but when the service runs, we receive the following error message when publishing a WMI class using Instrumentation.Publish() DirectoryNotFoundException - (Could not find a part of the path 'C:\Windows\system32\WBEM\Framework\root\MyNamespace\MyService'.) However, this directory does exist in the C:\Windows\syswow64 directory. If we manually copy that directory structure to the system32 directory, then everything works. However, we are looking for automated solution, because we have this packaged up in an MSI which we distribute onto many servers. We have tried running the 64-Bit version of InstallUtil, to see if that would work, however... and this is the really weird part... it gives us an error on install that says Installing WMI Schema: Started An exception occurred during the Install phase. System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Windows\system32\WBEM\Framework\root\MyNamespace\MyService.mof'. It looks as if somehow, the WMI installer flipped around. Has anyone else experienced this, or know of a work around?

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• C# file write permission issue under "Program Files" folder

  - by George2

  Hello everyone, I am using inno setup to make a installation package for my application, and my application is written by C# + .Net 2.0 + VSTS 2008. Inno setup = http://www.jrsoftware.org/isinfo.php and I install my application under Program Files/Foo folder (Foo is my application name). My application is targeting to Windows Vista. The issue I found is my program cannot write to the folder Program Files/Foo. And I need the permission of write to this folder in order to save some configuration files. The strange thing I notice is the folder Program Files/Foo is marked as readonly and I have checked all folders under Program Files are marked with read only, such as Office. My questions are, Why all folders are marked as read only under Program Files? It means we should not write to individual application folders under Program Files? If not, where should we write information to disk like user last selected configuration information of an individual application? If we could write to individual application folders under Program Files, what is the solution? I do not want my application to Run As administrator to solve this issue, and if there are solution to write to this folder, I want to require minimal permission if possible. thanks in advance, George

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• Low level qemu based debugging

  - by Dacav

  I've to test some low level code on an ARM architecture. Typically experimentation is quite complicated on the real board, so I was thinking about QEMU. What I'd like to get is some kind of debugging information like printfs or gdb. I know that this is simple with linux since it implements both the device driver for the QEMU Integrator and the gdb feature, but I'm not working with Linux. Also I suspect that extracting this kind of functionality from the Linux kernel source code would be complicated. I'm searching from some simple operating system that already implements one of those features. Do you have some advice? Thanks in advance.

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• XPATH query, HtmlAgilityPack and Extracting Text

  - by Soham

  I had been trying to extract links from a class called "tim_new" . I have been given a solution as well. Both the solution, snippet and necessary information is given here The said XPATH query was "//a[@class='tim_new'], my question is, how did this query differentiate between the first line of the snippet (given in the link above and the second line of the snippet). More specifically, what is the literal translation (in English) of this XPATH query. Furthermore, I want to write a few lines of code to extract the text written against NSE: <div class="FL gL_12 PL10 PT15">BSE: 523395 &nbsp;&nbsp;|&nbsp;&nbsp; NSE: 3MINDIA &nbsp;&nbsp;|&nbsp;&nbsp; ISIN: INE470A01017</div> Would appreciate help in forming the necessary selection query. My code is written as: IEnumerable<string> NSECODE = doc.DocumentNode.SelectSingleNode("//div[@NSE:]"); But this doesnt look right. Would appreciate some help.

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• Implementation of any Hamiltonian Path Problem algorithm

  - by Julien

  Hi all ! Here is my problem : I have an array of points, the points have three properties : the "x" and "y" coordinates, and a sequence number "n". The "x" and "y" are defined for all the points, the "n" are not. You can access and write them calling points[i]-x, points[i]-y, points[i]-n. i.e. : points[i]->n = var var = points[i]->n So the title maybe ruined the surprise, but I'm looking for a possible implementation of a solution to the Hamiltonian path problem : I need to set the "n" number of each point, so that the sequence is the shortest path (not cycle, the edges have to be disjoint) that goes exactly once through each point. I looked for a solution and I found The Bellman Ford Algorithm but I think it doesn't work since the problem doesn't specify that it has to go through all of the points is it correct ? If it is, does somebody has another algorithm and the implementation ? If the Bellman Ford Algorithm works, how would I implement it ? Thanks a lot, Julien

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• Low Latency Serial Communications In .Net

  - by bvillersjr

  I have been researching various third party libraries and approaches to low latency serial communications in .Net. I've read enough that I have now come full circle and know as little as I did when I started due to the variety of conflicting opinions. For example, the functionality in the Framework was ruled out due to some convincing articles stating: "that the Microsoft provided solution has not been stable across framework versions and is lacking in functionality." I have found articles bashing many of the older COM based libraries. I have found articles bashing the idea of a low latency .Net app as a whole due to garbage collection. I have also read articles demonstrating how P/Invoking Windows API functionality for the purpose of low latency communication is unacceptable. THIS RULES OUT JUST ABOUT ANY APPROACH I CAN THINK OF! I would really appreciate some words from those with been there / done that experience. Ideally, I could locate a solid library / partner and not have to build the communications library myself. I have the following simple objectives: Sustained low latency serial communication in C# / VB.Net 32/64 bit Well documented (if the solution is 3rd party) Relatively unimpacted (communication and latency wise) by garbage collection . Flexible (I have no idea what I will have to interface with in the future!) The only requirement that I have for certain is that I need to be able to interface with many different industrial devices such as RS485 based linear actuators, serial / microcontroller based gauges, and ModBus (also RS485) devices. Any comments, ideas, thoughts or links to articles that may iron out my confusion are much appreciated!

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