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• Robotics Simulator

  - by Arkapravo

  Which is the best robotics simulator ? Player Project (simulator + control interface) Microsoft Robotics Studio (simulator + control interface) KiKS (in Matlab, only for Khepera) MobotSim (for point like robots ) ROS (I have only heard about it) URBI (also, only heard about it) Any other As of now, I am just looking to get simple simulations of Potential Field method, Bug Algorithms, A* Algorithm etc ! This article gives a number of such softwares etc, however I was looking for a first hand view from fellow stackoverflowers. Anyone who has worked with any other software etc is most welcome to share his/her experience !

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• About "If.." in Scheme (plt-scheme)

  - by Amit

  I had a pretty simple requirement in my Scheme program to execute more than one statement, in the true condition of a 'if'. . So I write my code, something like this: (if (= 1 1) ((expression1) (expression2)) ; these 2 expressions are to be executed when the condition is true (expression3) ) Obviously, the above doesn't work, since I have unintentionally created a # procedure with # arguments. So, to get my work done, I simply put the above expressions in a new function and call it from there, in place of the expression1, expression2. It works. So, my point here is: is there any other conditional construct which may support my requirement here?

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• Open Source/Free Social Networking SDK

  - by Nix

  I am currently gathering some technology requirements for a site that will be a social network based. I don't want to re-invent the wheel so i am looking for some type of SDK or collection of tools that can provide me with a way of creating/managing a social network. I understand that no framework will probably fit my exact needs so I am also looking for a flexible/extensible framework. An example extension point would be allowing the user to provide sub networks, maybe a global network that could be sub classified as work and friends. Beyond that it would also be nice to somehow be able to import contacts from other networking sites (Facebook, Linked In, etc). My current technology suite will more than likely consist of the following: IIS 7.0 WCF Data Services SQL Server 2005/2008 ASP.NET front end. So my two questions are 1) C# Open Source Social Network SDK 2) C# Open Source Social Netowrk APIs (facebook, linked in, etc) If there is any more information you may need please let me know.

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• image focus calculation

  - by Oren Mazor

  Hi folks, I'm trying to develop an image focusing algorithm for some test automation work. I've chosen to use AForge.net, since it seems like a nice mature .net friendly system. Unfortunately, I can't seem to find information on building autofocus algorithms from scratch, so I've given it my best try: take image. apply sobel edge detection filter, which generates a greyscale edge outline. generate a histogram and save the standard dev. move camera one step closer to subject and take another picture. if the standard dev is smaller than previous one, we're getting more in focus. otherwise, we've past the optimal distance to be taking pictures. is there a better way? update: HUGE flaw in this, by the way. as I get past the optimal focus point, my "image in focus" value continues growing. you'd expect a parabolic-ish function looking at distance/focus-value, but in reality you get something that's more logarithmic

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• Splitting strings using a delimiter in python.

  - by Jahkr

  OK so I have a string that has this: Dan|warrior|54 I'm trying to make so I can use python and split it using | as the delimiter. Here's what I have so far: #!/usr/bin/env python dan = 'dan|warrior|54' print dan.split('|') and that results into this: ['dan', 'warrior', '54'] I know it's incomplete but what do I have to do to finish it? Yes, I tried googling this problem... but it's not happening. :( I want so that I can choose specifically which one from the delimiter so if I was dan.split('|')[1] .. it would pick warrior. See my point?

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• How to order by a known id value in mysql

  - by markj

  Hi, is it possible to order a select from mysql by using a known id first. Example: $sql = "SELECT id, name, date FROM TABLE ORDER BY "id(10)", id DESC Not sure if the above makes sense but what I would like to do is first start ordering by the known id which is 10 which I placed in quotes "id(10)". I know that cannot work as is in the query but it's just to point out what I am trying to do. If something similar can work I would appreciate it. Thanks.

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• Protected Members of Other Instances in Scala

  - by Masterofpsi

  I just ran into a difficulty while learning Scala. I have an inheritance hierarchy that is essentially equivalent to this: class A { protected def myMethod() = println("myMethod() from A") } class B extends A { def invokeMyMethod(a: A) = a.myMethod() } But trying to compile this sample, I get the error "test.scala:7: error: method myMethod cannot be accessed in A". Coming from Java, my understanding is that protected members should be accessible at any point from a derived class, and nowhere have I seen anything that tells me that protected members in Scala are limited by instance. Does anyone have an explanation for this?

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• 404 Error Hosting WCF Service via IIS 7.5 Shared Content

  - by Chad Gruka

  We're attempting to host a WCF Service (.NET 3.5 SP1) using Shared Content on IIS 7.5. At the moment it's returning a 404 error. My assumption at this point is that WCF can not be hosted via a UNC path (See workaroundHosting WCF service in IIS6 using UNC). Steps I've taken: - Established a FullTrust to/with the UNC path. - The service works hosting it on a local disk. - A basic HTML page renders without issue from the UNC path. - A ASPX page renders without issue from the UNC path. - Explicitly set "Full Control" permissions to the user running the service. The reason for using Shared Content in IIS 7.5 to host this WCF Service, and several other websites, in a web farm. Using Shared Content avoids the need for file replication between the nodes in the farm. (Note we are also using Shared Configuration to support this environment.)

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• jquery ui tabs major style change

  - by Jonah

  I am using jquery UI tabs and I need to majorly change the styling on it. I need to rempve the background image, the borders, almost everything. I need it to look minimal, and not like it's self contained. What's the best way to do this? I need to use the default UI styling for the calendar widget however, which is on the same page. I've done a lot of research and everyone seems to point to the theme-roller. However, i do not just want to change the colors and border radii. I need to delete crap. theme-roller seems to be just change things like colors (not really useful for the real world) Is it even worth using jquery UI for my tabs?

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• Remove characters after specific character in string, then remove substring?

  - by sah302

  I feel kind of dumb posting this when this seems kind of simple and there are tons of questions on strings/characters/regex, but I couldn't find quite what I needed (except in another language: http://stackoverflow.com/questions/2176544/remove-all-text-after-certain-point). I've got the following code: [Test] public void stringManipulation() { String filename = "testpage.aspx"; String currentFullUrl = "http://localhost:2000/somefolder/myrep/test.aspx?q=qvalue"; String fullUrlWithoutQueryString = currentFullUrl.Replace("?.*", ""); String urlWithoutPageName = fullUrlWithoutQueryString.Remove(fullUrlWithoutQueryString.Length - filename.Length); String expected = "http://localhost:2000/somefolder/myrep/"; String actual = urlWithoutPageName; Assert.AreEqual(expected, actual); } I tried the solution in the question above (hoping the syntax would be the same!) but nope. I want to first remove the queryString which could be any variable length, then remove the page name, which again could be any length. How can I get the remove the query string from the full URL such that this test passes?

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• Problems with sticky footer - CSS - main content wont go 100% height (float)

  - by Jamie

  I'm trying to implement hxxp://www.cssstickyfooter.com however I am having a few problems! See screenshot: hxxp://img22.imageshack.us/img22/2654/71161106.jpg The div "Content" contains both left and right columns. On smaller resolutions this is working as expected however once the user starts to increase there resolution the content doesn't expand as I intend it to. If you notice the blue box. That should stretch to the footer at the bottom of the page. If you notice that the blue divider line (right_container3-4) stops also at the same point. CODE HTML: hxxp://tinyurl.com/m39x52 CSS: hxxp://tinyurl.com/lb62ej I would apriciate any help at all! I've been racking my brains for ages on this one, its just a small site so I suppose it's not too much of an issue. But it's nice to know all the same! Thankyou P.S. Sorry about the URL formatting

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• What is the C# equivalent of this Excel VBA code for Shapes?

  - by code4life

  This is the VBA code for an Excel template, which I'm trying to convert to C# in a VSTO project I'm working on. By the way, it's a VSTO add-in: Dim addedShapes() As Variant ReDim addedShapes(1) addedShapes(1) = aBracket.Name ReDim Preserve addedShapes(UBound(addedShapes) + 1) addedShapes(UBound(addedShapes)) = "unique2" Set tmpShape = Me.Shapes.Range(addedShapes).Group At this point, I'm stumped by the addedShapes(), not sure what this is all about. Update: Matti mentioned that addedShapes() represents a variant array in VBA. So now I'm wondering what the contents of addedShapes() should be. Would this be the correct way to call the Shapes.Range() call in C#? List<string> addedShapes = new List<string>(); ... Shape tmpShape = worksheet.Shapes.get_Range (addedShapes.Cast<object>().ToArray()).Group(); I'd appreciate anyone who's worked with VBA and C# willing to make a comment on my question & problem!

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• Multithreading/Parallel Processing in PHP

  - by manyxcxi

  I have a PHP script that will generate a report using PHPExcel from data queried from a MySQL DB. Currently, it is linear in processing in that it gets the data back from MySQL, reads in the Excel template, writes the data to the template, then outputs it. I have optimized the code to the point that the data is only iterated over once, and there is very little processing done on the PHP side. The query returns hundreds of lines in less than .001 seconds, so it is running fast enough. After some timing I have found my bottlenecks to be (surprise, surprise) reading the template and writing the output. I would like to do this: Spawn a thread/process to read the template Spawn a thread/process to fetch the data Return back to parent thread - Parent thread will wait until both are complete Proceed on as normal My main questions are is this possible, is it worth it? If yes to both, how would you tackle it? Also, it is PHP 5 on CentOS

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• Use python decorators on class methods and subclass methods

  - by AlexH

  Goal: Make it possible to decorate class methods. When a class method gets decorated, it gets stored in a dictionary so that other class methods can reference it by a string name. Motivation: I want to implement the equivalent of ASP.Net's WebMethods. I am building this on top of google app engine, but that does not affect the point of difficulty that I am having. How it Would look if it worked: class UsefulClass(WebmethodBaseClass): def someMethod(self, blah): print(blah) @webmethod def webby(self, blah): print(blah) # the implementation of this class could be completely different, it does not matter # the only important thing is having access to the web methods defined in sub classes class WebmethodBaseClass(): def post(self, methodName): webmethods[methodName]("kapow") ... a = UsefulClass() a.post("someMethod") # should error a.post("webby") # prints "kapow" There could be other ways to go about this. I am very open to suggestions

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• How to sign installation files of a Visual Studio .msi

  - by Alex

  This may be a duplicate, though I can't find it at this time. If so please point me in the right direction. I recently purchased an authenticode certificate from globalsign and am having problems signing my files for deployment. There are a couple of .exe files that are generated by a project and then put into a .msi. When I sign the .exe files with the signtool the certificate is valid and they run fine. The problem is that when I build the .msi (using the visual studio setup project) the .exe files loose their signatures. So I can sign the .msi after it is built, but the installed .exe files continue the whole "unknown publisher" business. How can I retain the signature on these files for installation on the client machine? You help is appreciated. -Alex

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• Algorithm for analyzing text of words

  - by Click Upvote

  I want an algorithm which would create all possible phrases in a block of text. For example, in the text: "My username is click upvote. I have 4k rep on stackoverflow" It would create the following combinations: "My username" "My Username is" "username is click" "is click" "is click upvote" "click upvote" "i have" "i have 4k" "have 4k" .. You get the idea. Basically the point is to get all possible combinations of 'phrases' out of a sentence. Any thoughts for how to best implement this?

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• naive bayesian spam filter question

  - by Microkernel

  Hi guys, I am planning to implement spam filter using Naive Bayesian classification model. Online I see a lot of info on Naive Bayesian classification, but the problem is its a lot of mathematical stuff, than clearly stating how its done. And the problem is I am more of a programmer than a mathematician (yes I had learnt Probability and Bayesian theorem back in school, but out of touch for a long long time, and I don't have luxury of learning it now (Have nearly 3 weeks to come-up with a working prototype)). So if someone can explain or point me to location where its explained for programmers than a mathematician, it would be a great help. PS: By the way I have to implement it in C, if you want to know. :( Regards, Microkernel

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• IE6 Hacks: Getting jQuery tools expose to work properly on my site

  - by Wild Thing

  Hi, I am trying to get the jQuery tools 'expose' function to work properly in IE6. The page is http://204.51.246.10:12123/ You will need IE6 to reproduce the bug (obviously :)). If you click 'Sign In' on the top-right corner (below the 'Join Today!' button), you will notice that the sign in panel (fieldset#login-controls) is getting covered by the background of its parent element (.signinPanel), which is very weird. It is not on the top of z-index, and I can't figure out why. Please note that in order to get fieldset#login-controls positioned correctly, I have applied the following hack for IE6: $("#header, #header div, #header table, #header td, #header tr").css("position", "static"); $("fieldset#login-controls *").css("position", "static"); This might be the reason for the above. I am pretty lost at this point, as I can't figure what's going on - any advise would be appreciated. Cheers, Wild Thing

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• Voice transmission over LAN using java?

  - by Ala ABUDEEB

  Hello I'm building a java application which works in a LAN environment, every computer on that LAN have this application installed on it, at some point i need this application to transfer voice simultaneously to all computer over the LAN (voice broadcasting) according to the following mechanism: Only one computer of the LAN can send voice using a microphone(the administrator) All computers receive that voice simultaneously (of course using my application) The voice should be recorded on the administrator computer after finishing the session. Could anyone give me an idea of how to use java in working with voice transmission? What java library can help me do that? Please help, thank you

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• Intellij + GWT 2: Development Mode ignores changes to static content

  - by Kaffeine Coma

  The new Development Mode in GWT 2 is awesome, but unfortunately as launched from Intellij IDEA 9, it does not seem to notice changes made to static files such as html, css, etc. It immediately see changes in *.java files, but not the static ones. If I make a change in a static file I need to quite the Development Mode tool and re-launch it. This is painfully slow, and negates much of the point of using dev mode in the first place I assume this is some artifact resulting from the way the Intellij runner launches it- it creates an out/artifacts/project_war_exploded directory with the static content and class files. How can I get Intellij Dev Mode tool to follow changes made to the original static source files?

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• ASPNETDB and ASPSTATE database. How to change the connectionstrings?

  - by George

  I have two ASP-specific SQL Server databases 1) ASPState - To store session state 2) ASPNETDB - To store Security/Role stuff. In my web.config, I am specifying the connection string used to identify the location of the APState database: <sessionState mode="SQLServer" sqlConnectionString="server=(local)\sql2008b;uid=sa;pwd=iainttelling;" timeout="120"/> Where is the conenction string specified for the ASPNETDB database? I am trying to point it to a db on a remote server. I have a feeling it is somewhere in IIS orthe Machine Config. I'd like to add it to my WEB.CONFIG Could someone help me to do this?

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• suggestions for Membership in ASP.NET MVC application

  - by mare

  With this question I am mostly looking for answers from people that have implemented the out-of-the-box ASP.NET membership in their own database - I've set up the tables inside my database and as far as I can see they contain mostly what I need but not everything. I will have the notion of a Firm (Company) to which Users will belong so I will have to associate the aspnet_Users with my Firms table (each user will be a member of exactly one firm). If possible, provide some guidelines how did you do it and what I might run into if I have to modify the table design at some point in the future. Preferably I will be using the default Membership provider. I am having trouble to decide whether to go from scratch or use what ASP.NET already offers.

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• Hibernate: Parent/Child relationship in a single-table

  - by Dee

  I hardly see any pointer on the following problem related to Hibernate. This pertains to implementing inheritance using a single database table with a parent-child relationship to itself. For example: CREATE TABLE Employee ( empId BIGINT NOT NULL AUTO_INCREMENT, empName VARCHAR(100) NOT NULL, managerId BIGINT, CONSTRAINT pk_employee PRIMARY KEY (empId) ) Here, the managerId column may be null, or may point to another row of the Employee table. Business rule requires the Employee to know about all his reportees and for him to know about his/her manager. The business rules also allow rows to have null managerId (the CEO of the organisation doesn't have a manager). How do we map this relationship in Hibernate, standard many-to-one relationship doesn't work here? Example code would be appreciated.

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• Hibernate: Parent/Child relationship in a single-table

  - by Dee

  I hardly see any pointer on the following problem related to Hibernate. This pertains to implementing inheritance using a single database table with a parent-child relationship to itself. For example: CREATE TABLE Employee ( empId BIGINT NOT NULL AUTO_INCREMENT, empName VARCHAR(100) NOT NULL, managerId BIGINT, CONSTRAINT pk_employee PRIMARY KEY (empId) ) Here, the managerId column may be null, or may point to another row of the Employee table. Business rule requires the Employee to know about all his reportees and for him to know about his/her manager. The business rules also allow rows to have null managerId (the CEO of the organisation doesn't have a manager). How do we map this relationship in Hibernate, standard many-to-one relationship doesn't work here? Example code would be appreciated.

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• jQuery calculation plugin: show total in form field rather than text

  - by Katherine

  I'm embarrassed by the 'basicness' of this question, but after wasted hours, here goes. In an effort to do something with the jQuery Calculation plugin, I am playing with the basic example of the order form on the plugin site. I want to have the grand total as a form field,rather than text, so I can use the value. The function that calculates and shows the grand total is: function ($this){ // sum the total of the $("[id^=total_item]") selector var sum = $this.sum(); $("#grandTotal").text( // round the results to 2 digits sum.toFixed(2) ); } the total updates on keyup in: <span id="grandTotal"></span> But this does not work with: <input type="text" id="grandTotal" value=""/> Can anyone point me to what I need to add/change to make that work? To call my javascript basic would be a compliment, so please talk to me like I know nothing!

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