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  • Code Golf: Beehive

    - by LiraNuna
    The challenge The shortest code by character count that will generate a beehive from user input. A beehive is defined a a grid of hexagons in a size inputted by the user as two positive numbers greater than zero (no need to validate input). The first number (W) represents the width of the beehive - or - how many hexagons are on each row. The second number (H) represents the height of the beehive - or - how many hexagons are on each column. A Single hexagon is made from three ASCII characters: _, / and \, and three lines: __ / \ \__/ Hexagons complete each other: the first column of the beehive will be 'low', and the second will be high - alternating and repeating in the same pattern forming W hexagons. This will be repeated H times to form a total of WxH hexagons. Test cases: Input: 1 1 Output: __ / \ \__/ Input: 4 2 Output: __ __ __/ \__/ \ / \__/ \__/ \__/ \__/ \ / \__/ \__/ \__/ \__/ Input: 2 5 Output: __ __/ \ / \__/ \__/ \ / \__/ \__/ \ / \__/ \__/ \ / \__/ \__/ \ / \__/ \__/ Input: 11 3 Output: __ __ __ __ __ __/ \__/ \__/ \__/ \__/ \__ / \__/ \__/ \__/ \__/ \__/ \ \__/ \__/ \__/ \__/ \__/ \__/ / \__/ \__/ \__/ \__/ \__/ \ \__/ \__/ \__/ \__/ \__/ \__/ / \__/ \__/ \__/ \__/ \__/ \ \__/ \__/ \__/ \__/ \__/ \__/ Code count includes input/output (i.e full program).

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  • Traditional loop versus Action delegate in C#

    - by emddudley
    After learning about the Action delegate in C# I've been looking for ways I can best use it in my code. I came up with this pattern: Action<string> DoSomething = (lSomething) => { // Do something }; DoSomething("somebody"); DoSomething("someone"); DoSomething("somewhere"); If I were to have used a traditional loop, it would look something like this: List<string> lSomeList = new List<string>(); lSomeList.Add("somebody"); lSomeList.Add("someone"); lSomeList.Add("somewhere"); foreach (string lSomething in lSomeList) { // Do something } Are there any appreciable differences between the two? To me they look equally easy to understand and maintain, but are there some other criteria I might use to distinguish when one might be preferred over the other?

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  • Arduino - AdHoc Network Setup

    - by methodMan
    I`m currently working with an arduino trying to build an adhoc network to which a device can connect to and send web request to. The problem I am currently having is that I can only set up one connection and then when that connection is terminated (client.stop()) all subsequent connections are not picked up by the server, even a curl command just sits there spinning. The first connection I start when I reset the server works fine and I am able to talk to the server; but after that, the arduino can no longer find new clients (even though it's trying with the library given). I`m using the sparkfun library for the wifly shield cloned from github, along with an Arduino Uno. My current code is based off their default example 'WiFly_AdHoc_Example' but I had to remove a few things to get the network to start up which might be the cause of this problem. Here is the .ino file that I am running. #include <SPI.h> #include <WiFly.h> //#include <SoftwareSerial.h> //SoftwareSerial mySerial( 5, 4); //Part from example not used(see below) WiFlyServer server(80); void setup() { Serial.begin(9600); //The code below is from the example but when I run it the WiFly will hang // on Wifly.begin(). Without it the WiFly starts up fine but only works for // one request. //mySerial.begin(9600); //WiFly.setUart(&mySerial); // Tell the WiFly library that we are not //using the SPIUart Serial.println("**************Starting WiFly**************"); // Enable Adhoc mod WiFly.begin(true); Serial.println("WiFly started, creating network."); if (!WiFly.createAdHocNetwork("wifly")) { Serial.print("Failed to create ad hoc network."); while (1) { // Hang on failure. } } Serial.println("Network created"); Serial.print("IP: "); Serial.println(WiFly.ip()); Serial.println("Starting Server..."); server.begin(); Serial.print("Server started, waiting for client."); } void loop() { delay(200); WiFlyClient client = server.available(); if (client) { Serial.println("Client Found."); // a string to store received commands String current_command = ""; while (client.connected()) { if (client.available()) { //Gets a character from the sent request. char c = client.read(); if (c=='#' || c=='\n') //End of extraneous output { current_command = ""; } else if(c!= '\n') { current_command+=c; } if (current_command== "get") { // output the value of each analog input pin for (int i = 0; i < 6; i++) { client.print("analog input "); client.print(i); client.print(" is "); client.print(analogRead(i)); client.println("<br />"); } } else if(current_command== "hello") { client.println("Hello there, I'm still here."); } else if (current_command== "quit") { client.println("Goodbye..."); client.stop(); current_command == ""; break; } else if (current_command == "*OPEN*") { current_command == ""; } } } // give the web browser time to receive the data delay(200); // close the connection client.stop(); } } If anyone understands this better then I (I`m new to arduino) please leave some helpful comments. Or just help me out on getting this little web server up and running so that I can hit it with more then one request. If there is any other helpful information I can provide please let me know. Thanks for reading and hope you can help. EDIT: Using telnet I can successfully connect (the first time) and send commands to the arduino including one to terminate the connection (calls the client.stop() method). But when I try to reconnect though telnet, it says the connection was successful but on the arduino it's still looping thinking the client is still false. WHAT??? I know right, I'm getting mixed messages from telnet vs arduino. None of the commands work obviously since the ardunio is still looping waiting for a client that evaluates to true. I'm gonna take a look at WiFlyServer from the library I imported and see if I can dig up the problem because somehow that server.available() method isn't finding new clients. Noticing a lot of TODO's in the library code.... EDIT: So I found the reason for the problem, it was in WiFlyServer.cpp file from the sparkfun library. The code that was causing the reconnect issue was infact in the server.availible() method. Right at the top of the method, there is a check: // TODO: Ensure no active non-server client connection. if (!WiFly.serverConnectionActive) { activeClient._port = 0; } For some reason when I comment this out, I can reconnect fine and everything works as it should. I will now dive into the library and see if I can fix this, I'm not exactly sure what this is doing but it gets called when the server connection is not active and is somehow blocking subsequent connections. Does anyone have any ideas how I might get to the root of this problem without using this commenting hack? Please help, no-one has commented or answered yet! Don't you want to join in on the fun???

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  • Optimizing a large iteration of PHP objects (EAV-based)

    - by Aron Rotteveel
    I am currently working on a project that utilizes the EAV model. This turns out to work quite well, but like many others I am now stumbling upon some performance issues. The data set in this particular case consists of aproximately 2500 entities, each with aprox. 150 attributes. Each entity and each attribute is represented by a PHP-object. Since most parts of the application only iterate through a filtered set of entities, we have not had very large issues yet. Now, however, I am working on an algorithm that requires iteration over the entire dataset, which causes a major impact on performance. This information is perhaps not very much to work with, but since this is an architectural problem, I am hoping for a architectural pattern to help me on the way as well. Each entity, including it's attributes takes up aprox. 500KB of memory.

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  • AdMob SDK for iPad?

    - by pix0r
    Trying to get my Universal app released and I rely on AdMob ads for revenue in this particular app. I'm having an issue getting AdMob support working, though I keep finding references to people actually running AdMob on their iPad Simulators. Terminating app due to uncaught exception 'AdMobInvalidLibaryVersionException', reason: 'This version of AdMob SDK is incompatible with the iPhone 3.2 SDK or above. Make sure your Active SDK is set to 3.1.X . If you need to build with 3.2, use the 3.2 preview library.' I have not been able to find this "3.2 preview library" anywhere. Any ideas?

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  • Ajaxifying Struts2 application

    - by scotty
    I just started working on an application that is build on the Struts2 framework. I am coming from a .Net application with lot of Ajax features like dimming the rest of the site and show dialog box 'please wait while X is happening' ...auto complete and such other ajax features. I searched google for Ajax plugins for Struts2 but did not find anything that looks like it would be worth it. Is my only option to use jquery and its plugins? Is this a pattern that some of you have seen also? Hopefully Java applications are not dead soon because of its inability to cope with ajax...compared to .Net

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  • Regex to detect a proper permalink?

    - by Fedor
    These permalinks above are rerouted to my page: page.php?permalink=events/foo page.php?permalink=events/foo/ page.php?permalink=ru/events/foo page.php?permalink=ru/events/foo/ The events is dynamic, it could be specials or packages. My dilemma is basically; I need to detect an empty link in order so I can feed a robots no index meta tag in the case of: page.php?permalink=events page.php?permalink=events/ page.php?permalink=ru/events/ page.php?permalink=ru/events I can't use a simple pattern such as [a-zA-Z]+\/?(.+)/ since it won't work on the i18n permalinks. What regex could I use which would detect this, using $_GET['permalink'] as the reference to the permalinks? And avoid false positives? Update: Empty link means there's no fragment after the "events/" part. These are empty: page.php?permalink=events page.php?permalink=events/ page.php?permalink=ru/events/ page.php?permalink=ru/events

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  • How to use DAOs with hibernate/jpa?

    - by Ari
    Assuming the DAO structure and component interaction described below, how should DAOs be used with persistence layers like hibernate and toplink? What methods should/shouldn't they contain? Would it be bad practice to move the code from the DAO directly to the service? For example, let's say that for every model we have a DAO (that may or may not implement a base interface) that looks something like the following: public class BasicDao<T> { public List<T> list() { ... } public <T> retrieve() { ... } public void save() { ... } public void delete() { ... } } Component interaction pattern is -- service DAO model

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  • ASP.NET GridView and UpdatePanel

    - by Echilon
    I have a GridView, inside a UserControl, inside an UpdatePanel on a page. There's a button in the GridView which needs to fire a postback. What happens is: User clicks button - RowCommand Fires - Custom event is raised on UserControl - Page detects this and changes the active view index for a multiview and also the page title and some other controls outside the UpdatePanel. The problem is, the page posts back asyncchronously, the page title changes, but the actions requireing a full postback don't happen because a full postback doesn't occur. To register the button as a postback trigger I'm using: ImageButton btnResults = e.Row.FindControl("btnResults") as ImageButton; ScriptManager scrCurrent = ScriptManager.GetCurrent(this.Page); if (btnResults != null && scrCurrent != null) { scrCurrent.RegisterPostBackControl(btnResults); } I know this is a bit of a complicated problem, but I'd really appreciate any help.

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  • Openfire scalability question XMPP Server

    - by candoyo
    Hello! Do you guys know how well openfire scales? My users will be using the application to do normal chatting like msn no file transfer for now. We will be using Amazon's EC2 server to run the chat server we would like to support over 1 Million users in total and around 30-50K active users during peak times. Since clustering is now opensource, I though Openfire might be the way to go, how much will it cost for the coherence license or can I bipass that somehow? Also, I wanted to develop plugin for Openfire if we go with it. Any pointers on how to set up a dev env and get going would be helpful too! Thanks ya'all! :)

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  • InstallShield setup and Click-Once

    - by QQQ
    Hi InstallShield 10 apparently can create an installer and integrate with click once, but this feature is not active in trial version. Anyway I tried to create a click once deployment by hand (using mage) and succeed with a sample wpf application, what I want to do is click once with an installShield setup.exe file, buy it seems that it's not a .net application and I can't use it for click once. Does anyone know how installShield manages this with it's click once feature? or how can I create click once with the regular setup.exe file. Thanks.

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  • Flex TextArea leading invalid

    - by Andreas
    Hi, When I set leading to 0 with Verdana (and others to) for a Flex TextArea I get strange results: fontsize - space between baselines 8 - 10 (125%) 10 - 12 (120%) 12 - 14 (117%) 14 - 17 (121%) 16 - 18 (113%) 18 - 22 (122%) 20 - 25 (125%) 25 - 31 (124%) shouldn't all of these be the same (should only be 100%)? Or least follow a pattern, because I can't se any. :( When i set leading to 0, the space between my baselines should be the same as the font size/height. This is not the case here. How do I know how to get the space between the baseline to be equal to the height of the font?

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  • Django query: Count and Group BY

    - by Tyler Lane
    I have a query that I'm trying to figure the "django" way of doing it: I want to take the last 100 calls from Call. Which is easy: calls = Call.objects.all().order_by('-call_time')[:100] However the next part I can't find the way to do it via django's ORM. I want to get a list of the call_types and the number of calls each one has WITHIN that previous queryset i just did. Normally i would do a query like this: "SELECT COUNT(id),calltype FROM call WHERE id IN ( SELECT id FROM call ORDER BY call_time DESC LIMIT 100 ) GROUP BY calltype;" I can't seem to find the django way of doing this particular query. Here are my 2 models: class Call( models.Model ): call_time = models.DateTimeField( "Call Time", auto_now = False, auto_now_add = False ) description = models.CharField( max_length = 150 ) response = models.CharField( max_length = 50 ) event_num = models.CharField( max_length = 20 ) report_num = models.CharField( max_length = 20 ) address = models.CharField( max_length = 150 ) zip_code = models.CharField( max_length = 10 ) geom = models.PointField(srid=4326) calltype = models.ForeignKey(CallType) objects = models.GeoManager() class CallType( models.Model ): name = models.CharField( max_length = 50 ) description = models.CharField( max_length = 150 ) active = models.BooleanField() time_init = models.DateTimeField( "Date Added", auto_now = False, auto_now_add = True ) objects = models.Manager()

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  • Anchor bug on IE9, anchor hitbox overlapped

    - by user1456399
    The menu below works just fine in Firefox and Chrome, but in IE9, but hitbox for the "HOME" anchor is being covered partially by the list item behind it except for the actual test, and a single horizontal pixel line at the top and bottom of the button. Can anyone see what I'm missing? Code to follow: index.html <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html;charset=utf-8" > <title>Navigation</title> <style> .menu-container { width:960px; height:45px; margin:0 auto; position:relative; z-index:2; background-color: #3d3d3d; margin-bottom: 20px; } .menu-navigation { font-family:Arial, Helvetica, sans-serif; font-size:13px; list-style:none; padding:0; margin:0; text-align: right; font-size: 0; /* Removes whitespace between <li> */ } .menu-navigation > li { display:inline; margin:0; border-left:solid 1px #242424; background-color:transparent; font-size: 12px; padding: 15px 0 15px 0; } .menu-navigation > li:hover, .menu-navigation > li.current-menu-item { background-color:#202020; } .menu-navigation > li.active, .menu-navigation > li.active:hover { background-color:#131313; } .menu-navigation > li a { text-decoration:none; color:#bbbbbb; } .menu-navigation > li a:hover { color:#efefef; } .menu-navigation > li span a { color:#ffffff; } .menu-navigation > li a:focus { outline:none; } .menu-navigation > li.menu-item-parent > span, .menu-navigation > li > span > a { text-transform:uppercase; outline:0; text-decoration:none; color:#ffffff; text-shadow:1px 1px 1px #000000; line-height: 45px; display: inline-block; height: 45px; padding: 0 20px 0 20px; } .menu-navigation > li.menu-item-parent > span { background:url("../img/down.png") no-repeat right center; } .menu-navigation > li.menu-item-parent > span:hover, .menu-navigation > li > span > a:hover { cursor:pointer; } </style> </head> <body> <div class="menu-container"> <ul class="menu-navigation"> <li><span><a href="#">This is a link</a></span></li> <li><span><a href="#">This is a link</a></span></li> <li class="menu-item-parent"><span>Not a link</span></li> <li class="menu-item-parent"><span>Not a link</span></li> <li class="menu-item-parent"><span>Not a link</span></li> </ul> </div> </body> </html> EDIT: Alright, I've changed the code to isolate the issue, and narrowed down the problem CSS. Simply adding a background image fixes the issue. The code is set up so it styles so the hit boxes for all the menu items are the same regardless if there's a link in them or not to facilitate an "onClick" drop down on those menu items without anchors. Refer to lines 81 - 86. Remove those lines (just a background image), and the hit box issue is seen in the menu items "NOT A LINK" as well. Further, the act of adding a background image fixes the hit box issue of "THIS IS A LINK" menu items. Simply add the following snippet to the CSS: .menu-navigation > li > span > a { background:url("../img/down.png") no-repeat right center; } Adding a background image, even if there is no actual image, is changing something with regards to the hit box... I'm just not sure what...

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  • DataSource for Tomcat web app, Spring and Hibernate

    - by EugeneP
    Web app runs on Tomcat. Datasource is configured with Spring configuration, and is used by Hibernate. If we cannot use JNDI, what would you suggest to use as a DataSource? org.springframework.jdbc.datasource.DriverManagerDataSource will be ok? It's not very good, but sincerely speaking, it can be used on production server, right? Just a bit of headache with too frequent connection reopening. Also, we can use BasicDataSource from Apache. It's much better of course, but here's the question. IF WE DON'T USE JNDI, THEN: If every instance of an app will create its own copy of a DataSource, and every DataSource can have 5 open connections, what do we get? Num_of_running_apps * Num_of_max_active_connections = max active open connection on a DB for this user? Second question: from the perspective of Hibernate, is there any difference about what datasource implementation is used? Will it work with no matter what datasource perfectly and in a stable way?

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  • How to effectively measure developer's work hours?

    - by twk
    I have a few software developers working for my projects and I would like to provide them a way to register time they spent on real development. There is good will to register development hours, no force, but we try to avoid techniques like excel sheets register because this is so uncomfortable. I can track svn commits, but this is unreliable. Developers also helps supporting different projects during the day, so assuming they work on one project by whole day is not true. I've seen utilities that popups a message every hour to confirm the project you're working on but this is annoying. Some kind of active-window-title-anaylzer might help (you can get solution name from there in the case of Visual Studio) but I have no experience with such idea. If you have any experience with programmers/designers work hours registration, please share with me. Thanks

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  • What's a good tutorial for creating a gem with RSpec?

    - by ramon.tayag
    I've been searching around for ways to create a gem with RSpec, but haven't found descriptive tutorials. I started out with Ryan Bates' Making a gem, but I'm looking for a tutorial that discusses creating an acts_as style gem with RSpec. By acts_as, I mean to say that the gem adds certain methods to an existing class in Rails. Why is this important? Because I've found gem templates like New Gem, got a spec to run but when I try to test an Active Record object it starts choking. I've tried requiring active_record in spec_helper.rb but I must be doing something wrong because it doesn't solve the problem. When it comes to plugins, I found this Rails Guide. If there's a gem version for that around that'd be awesome. Thanks guys! P.S. I love screencasts.

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  • Why is there no music streaming API service?

    - by Chad Johnson
    Apple has decided to kill lala.com. I loved that site. Now, everyone has to go back to paying $0.89+ for songs from Amazon, iTunes, etc. Lame. Rhapsody would be great, except there are no clients for Mac or Linux. They do have a web interface, buy it is nothing compared to lala's web 2.0y interface. What I just don't understand is, why is there no music API streaming service out there? Basically, developers could hook the service into any desktop or web app, and then users of the app could pay $x a month (like with Rhapsody) and play any amount of music, so long as their subscription is active. Why not? Lala streamed music to web browsers, so surely it could be as secure as lala is (was), preventing music theft.

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  • Integer comparison as string

    - by J Pollack
    Hi I have an integer column and I want to find numbers that start with specific digits. For example they do match if I look for '123': 1234567 123456 1234 They do not match: 23456 112345 0123445 Is the only way to handle the task by converting the Integers into Strings before doing string comparison? Also I am using Postgre regexp_replace(text, pattern, replacement) on numbers which is very slow and inefficient way doing it. The case is that I have large amount of data to handle this way and I am looking for the most economical way doing this.

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  • VBScript + Regular Expressions

    - by Karthik
    Dim sString sString = "John;Mary;Anne;Adam;Bill;Ester" Is there a regex I can use to retrieve the following from the above list: John (; at the end of the name) Anne (; at the beginning and end) Ester (; at the beginning) I am currently using the following regex for each: 1. Joh.* 2. .*An.* 3. .*st.* But, the above retrieves the entire string instead of the values I want. How can I get the correct values? Code: Dim oRegex : Set oRegex = New RegExp oRegex.Global = False oRegex.IgnoreCase = False 'John oRegex.Pattern = "Joh.*" Set oMatch = oRegex.Execute(sString) sName = oMatch(0) The above code retrieves the entire string, instead of only John. Same issue with the others :(

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  • Asp.Net MVC 2 Client validation implementation for Enterprise Library Validation Block

    - by er-v
    Hello to everybody. I've found a very good article about how to use EntLib Validation Block for server validation in MVC 2. But as there pointed out The current design of EntLib’s Validation Application Block uses the Composite pattern; that is, when we ask for validation for an object, it returns back a single validator object that contains a list of all the validation work to be done. While this is very convenient from a normal usage scenario, the unfortunate side-effect is that we can’t “peek inside” to see what the individual validations are that it’s doing, and therefore can’t generate the appropriate client-side validation hints. So how is it possible to implement client side validation for EntLib? Is there work around?

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  • Xcode 3.2 + LLVM = no local symbols when debugging

    - by glebd
    I have a project for Mac OS X 10.5 that I'm building on 10.6 using Xcode 3.2. When I use GCC 4.2 for Debug build and hit a breakpoint, Xcode debugger displays local variable information normally. If I choose LLVM GCC 4.2 or Clang LLVM, when I hit breakpoint, local symbols are not available, and GDB says No symbol 'self' in current context if I try to print self or any other local symbol. In all cases Generate debug info option is set. The Debug configuration is set to $(NATIVE_ARCH) and 10.5 SDK, Build active architecture only option is set. When GDB starts, I can see it is being configured as x86_64-apple-darwin. I must be missing something obvious. How do I make GDB show local symbols when using a LLVM compiler?

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  • emacs23 pops up debugger way too frequently

    - by werner r.
    Since I've upgraded to Ubuntu lucid and emacs23, Emacs pops up the debugger in situations, where emacs22 does not. For example, when hitting C-c C-c in org-mode, emacs22 simply states can do nothing useful at this location, whereas in emacs23 the debugger shows up. Debugger entered--Lisp error: (error "C-c C-c can do nothing useful at this location") signal(error ("C-c C-c can do nothing useful at this location")) error("C-c C-c can do nothing useful at this location") org-ctrl-c-ctrl-c(nil) call-interactively(org-ctrl-c-ctrl-c nil nil) That only illustrates the pattern -- the behavior is not limited to org-mode. Occurring every 3 minutes, it really annoys me. How can I prevent it? I've already tried to stop this using debug-on-error and stack-trace-on-error: it didn't work.

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  • Show blank UITableViewCells in custom UITableView

    - by Typeoneerror
    I am trying to customize a UITableView. So far, it looks good. But when I use a custom UITableViewCell sub-class, I do not get the blank table cells when there's only 3 cells: Using the default TableView style I can get the repeating blank rows to fill the view (for example, the mail application has this). I tried to set a backgroundColor pattern on the UITableView to the same tile background: UIColor *color = [UIColor colorWithPatternImage:[UIImage imageNamed:@"score-cell-bg.png"]]; moneyTableView.backgroundColor = color; ...but the tile starts a bit before the TableView's top, so the tile is off once the actual cell's are done displaying: How can I customize my tableview but still keep the blank rows if there's less rows than fill a page?

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  • :focus in IE not working

    - by o-logn
    Hey, I've created a site with CSS that requires the :focus pseudo class. I change the 'filter' and 'background-image' effects when a textbox is selected (i.e. has focus). This works in Chrome/FF, but doesn't seem to work in IE8 (and, presumable, previous versions if IE). I tried to look for answers, and have tried to use :active - but that doesn't work. Is there a way of changing attributes such as 'filter' using psuedo-classes? Failing that, can I do it in JS with the OnClick event? Thanks

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