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• Java Simple WGS84 Lat Lon to Pixel X, Y

  - by Cnich

  I've read a multitude of information regarding map projection today. The amount of information available is overwhelming. I am attempting to simply convert lat, long values into a screen X, Y coordinate not using any map. I do not need the values projected onto any map, just on the window. The window itself is representing approx. a 1500x1500 meter location. Lat, Long accuracy needed is to a 1/10th of a second. What may be some simpler ways in converting lat/long representation to the screen? I've read several articles and post regarding translation onto images, but nothing related to the natural java coordinate system. Thanks for any insight.

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• Building a directory tree from a list of file paths

  - by Abignale

  I am looking for a time efficient method to parse a list of files into a tree. There can be hundreds of millions of file paths. The brute force solution would be to split each path on occurrence of a directory separator, and traverse the tree adding in directory and file entries by doing string comparisons but this would be exceptionally slow. The input data is usually sorted alphabetically, so the list would be something like: C:\Users\Aaron\AppData\Amarok\Afile C:\Users\Aaron\AppData\Amarok\Afile2 C:\Users\Aaron\AppData\Amarok\Afile3 C:\Users\Aaron\AppData\Blender\alibrary.dll C:\Users\Aaron\AppData\Blender\and_so_on.txt From this ordering my natural reaction is to partition the directory listings into groups... somehow... before doing the slow string comparisons. I'm really not sure. I would appreciate any ideas. Edit: It would be better if this tree were lazy loaded from the top down if possible.

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• Performance: use a BinaryReader on a MemoryStream to read a byte array, or read directly?

  - by Virtlink

  I would like to know whether using a BinaryReader on a MemoryStream created from a byte array (byte[]) would reduce performance significantly. There is binary data I want to read, and I get that data as an array of bytes. I am currently deciding between two approaches to read the data, and have to implement many reading methods accordingly. After each reading action, I need the position right after the read data, and therefor I am considering using a BinaryReader. The first, non-BinaryReader approach: object Read(byte[] data, ref int offset); The second approach: object Read(BinaryReader reader); Such Read() methods will be called very often, in succession on the same data until all data has been read. So, using a BinaryReader feels more natural, but has it much impact on the performance?

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• Qt, unit testing and mock objects.

  - by Eye of Hell

  Hello. Qt framework has internal support for testing via QtTest package. Unfortunately, i didn't find any facilities in it that can assist in creating mock objects. Qt signals and slots offers a natural way to create a unit-testing friendly units with input (slots) and output (signals). But is it any easy way to test that calling specified slot in object will result in emitting correct signals with correct arguments? Of course i can manually create a mock objects and connect them to objects being tested, but it's a lot of code. Maybe it's some techniques exists that allows to somehow automate mock objects creation while unit-testing Qt-based applications?

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• How can I make a grid of clickable images from a list of data in WPF?

  - by mico

  Hello, I am a seasoned C and Java programmer, but an absolute WPF newbie. I am creating a kiosk application that will display a list of images of products that the user will click to see product details and maybe place an order. I am trying to structure my app with MVVM Foundation because I am used to the benefits of structure and tests. I wonder what is the most natural way to create a grid of clickable images that will fill the screen left to right, top to bottom (or the other way round, I have no exact requirements). Any image should be bound to an object that will become current and be displayed in the next screen. Thanks for your help.

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• jQuery/AJAX type-ahead/auto-complete

  - by Prasad

  I have read several articles/questions/forums discussing the best auto-complete plugin for jQuery. After trying several good ones, I've realized a flaw in most. If you are looking up countries and type 'In', a couple of countries show up. If you continue typing I-n-d-i-a, this results in 5 AJAX calls (see http://www.freeimagehosting.net/uploads/6f1bcd69e1.png) its quite natural that India is a subset of In, so why call again? We need to simply filter the retrieved list client-side. Anyone knows about such an implementation? What is the status of the Jquery Autocomplete feature? I read at StackOverflow that it is no longer available with Jquery; but the Jquery website has a 'New' mark besides the link to Autocomplete. Thanks

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• Libreoffice Calc run macro with HYPERLINK

  - by Kurt Borno

  I'm trying to use hyperlinks instead of buttons to run Basic macros. It seems to be more natural to me because hyperlinks are directly connected to a cell and buttons are not. I'm using the following Formula: =HYPERLINK("vnd.sun.star.script:Standard.Module1.Test?language=Basic&location=document";"Check") It should call the Subroutine Test placed in the document's macros under Standard.Module1 and display the Text 'Check' in the Cell it is written. This works absolutely fine with libreoffice 3.6.1.2 but it doesn't work at all with version 4.1.4.2. I can't see any errors it just happens nothing at all. I tried to simply click the Hyperlink and also to hold CTRL and click it. Same result - nothing. When I use a button the macro works as expected. Does anyone know how to solve this problem?

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• Extracting pure content / text from HTML Pages by excluding navigation and chrome content

  - by Ankur Gupta

  Hi, I am crawling news websites and want to extract News Title, News Abstract (First Paragraph), etc I plugged into the webkit parser code to easily navigate webpage as a tree. To eliminate navigation and other non news content I take the text version of the article (minus the html tags, webkit provides api for the same). Then I run the diff algorithm comparing various article's text from same website this results in similar text being eliminated. This gives me content minus the common navigation content etc. Despite the above approach I am still getting quite some junk in my final text. This results in incorrect News Abstract being extracted. The error rate is 5 in 10 article i.e. 50%. Error as in Can you Suggest an alternative strategy for extraction of pure content, Would/Can learning Natural Language rocessing help in extracting correct abstract from these articles ? How would you approach the above problem ?. Are these any research papers on the same ?. Regards Ankur Gupta

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• Best practices for combining Lucene.NET and a relational database?

  - by FlySwat

  I'm working on a project where I will have a LOT of data, and it will be searchable by several forms that are very efficiently expressed as SQL Queries, but it also needs to be searched via natural language processing. My plan is to build an index using Lucene for this form of search. My question is that if I do this, and perform a search, Lucene will then return the ID's of matching documents in the index, I then have to lookup these entities from the relational database. This could be done in two ways (That I can think of so far): N amount of queries (Horrible) Pass all the ID's to a stored procedure at once (Perhaps as a comma delimited parameter). This has the downside of being limited to the max parameter size, and the slow performance of a UDF to split the string into a temporary table. I'm almost tempted to mirror everything into lucenes index, so that I can periodicly generate the index from the backing store, but only need to access it for the frontend. Advice?

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• f# iterating over two arrays, using function from a c# library

  - by user343550

  I have a list of words and a list of associated part of speech tags. I want to iterate over both, simultaneously (matched index) using each indexed tuple as input to a .NET function. Is this the best way (it works, but doesn't feel natural to me): let taggingModel = SeqLabeler.loadModel(lthPath + "models\penn_00_18_split_dict.model"); let lemmatizer = new Lemmatizer(lthPath + "v_n_a.txt") let input = "the rain in spain falls on the plain" let words = Preprocessor.tokenizeSentence( input ) let tags = SeqLabeler.tagSentence( taggingModel, words ) let lemmas = Array.map2 (fun x y -> lemmatizer.lookup(x,y)) words tags

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• Deriving arrays in mathematics

  - by Gio Borje

  So I found some similarities between arrays and set notation while learning about sets and sequences in precalc e.g. set notation: {a | cond } = { a1, a2, a3, a4, ..., an} given that n is the domain (or index) of the array, a subset of Natural numbers (or unsigned integer). Most programming languages would provide similar methods to arrays that are applied to sets e.g. upperbounds & lowerbounds; possibly suprema and infima too. Where did arrays come from?

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• Using numeric_limits::max() in constant expressions

  - by FireAphis

  Hello, I would like to define inside a class a constant which value is the maximum possible int. Something like this: class A { ... static const int ERROR_VALUE = std::numeric_limits<int>::max(); ... } This declaration fails to compile with the following message: numeric.cpp:8: error: 'std::numeric_limits::max()' cannot appear in a constant-expression numeric.cpp:8: error: a function call cannot appear in a constant-expression I understand why this doesn't work, but two things look weird to me: It seems to me a natural decision to use the value in constant expressions. Why did the language designers decide to make max() a function thus not allowing this usage? The spec claims in 18.2.1 that For all members declared static const in the numeric_limits template, specializations shall define these values in such a way that they are usable as integral constant expressions. Doesn't it mean that I should be able to use it in my scenario and doesn't it contradict the error message? Thank you.

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• Language of variable names? (native foreign language speakers)

  - by Jj

  We are a spanish speaking development team, we code in django and we all are pretty fluent in english, as all documentation, sample code, APIs, etc come in english. On our last project we chose to name all the variables, class names, modules, files and such in english, even though the whole application was in spanish, we kept a strings file where all our spanish was stored. We did this because it seemed more natural to read the whole code in one language, since keywords, constructs and dependencies have names in english. On new projects we are starting, we are having second thoughts about other teams mantaining our code or just having 3rd parties having to deal with templates or context in spanish. Do you know of any best practice on this matter?

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• how to programming SYSTEM for reading_comperhension question in English.

  - by michael123

  hi , i have to do some study for reading_comperhension in English. my work is ok but there is part from natural language - nlp area that i have to used . i want some help about QAsystem , how to answer the reading_comperhension automaticly .i have simple system about it that i get from this website http://www.cs.utah.edu/contest/2003/ , there is simple system in java but did not work to my i try to load the file from Remedia dataset that have the reading_comperhension story, but no result. after run this system , i have to develop by current technique such as rule based or pattern machine or combined with simple named entity.how to make that and which of them is petter to combined with the QAsys. thank you

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• How to document an XML Schema?

  - by lucas clemente

  I have developed a XML schema for an application I wrote. Now I want to document the valid structure for the end user, however I can't come up with any natural way to do this. I've seen things like xs3p, which essentially converts a xsd schema to a HTML representation, however that doesn't look like good documentation to me; the user shouldn't need to know anything about schemas to understand what he is allowed to do. Any ideas how to document this? Any programs / editors / graphical solutions or simply concepts I can build on?

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• Junit vs TestNG

  - by Sam Merrell

  At work we are currently still using Junit3 to run our tests. We have been considering switching over to Junit4 for new tests being written but I have been keeping an eye on TestNG for a while now. What experiences have you all had with either Junit4 or TestNG and which seems to work better for very large numbers of tests. Having flexibility in writing tests is also important to us since our functional tests cover a wide aspect and need to be written in a variety of ways to get results. Old tests will not be re-written as they do their job just fine. What I would like to see in new tests though is flexibility in the way the test can be written, natural assertions, grouping, and easily distributed test executions.

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• Django comparing model instances for equality

  - by orokusaki

  I understand that, with a singleton situation, you can perform such an operation as: spam == eggs and if spam and eggs are instances of the same class with all the same attribute values, it will return True. In a Django model, this is natural because two separate instances of a model won't ever be the same unless they have the same .pk value. The problem with this is that if a reference to an instance has attributes that have been updated by middleware somewhere along the way and it hasn't been saved, and you're trying to it to another variable holding a reference to an instance of the same model, it will return False of course because they have different values for some of the attributes. Obviously I don't need something like a singleton , but I'm wondering if there some official Djangonic (ha, a new word) method for checking this, or if I should simply check that the .pk value is the same with: spam.pk == eggs.pk I'm sorry if this was a huge waste of time, but it just seems like there might be a method for doing this, and something I'm missing that I'll regret down the road if I don't find it.

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• Detect the URI encoding automatically in Tomcat

  - by Roland Illig

  I have an instance of Apache Tomcat 6.x running, and I want it to interpret the character set of incoming URLs a little more intelligent than the default behavior. In particular, I want to achieve the following mapping: So%DFe => Soße So%C3%9Fe => Soße So%DF%C3%9F => (error) The bevavior I want could be described as "try to decode the byte stream as UTF-8, and if it doesn't work assume ISO-8859-1". Simply using the URIEncoding configuration doesn't work in that case. So how can I configure Tomcat to encode the request the way I want? I might have to write a Filter that takes the request (especially the query string) and re-encodes it into the parameters. Would that be the natural way?

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• RESTful Question/Answer design?

  - by Kirschstein

  This is a toy project I'm working on at the moment. My app contains questions with multiple choice answers. The question url is in the following format, with GET & POST mapping to different actions on the questions controller. GET: url.com/questions/:category/:difficulty => 'ask' POST: url.com/questions/:category/:difficulty => 'answer' I'm wondering if it's worth redesigning this into a RESTful style. I know I'd need to introduce answers as a resource, but I'm struggling to think of a url that would look natural for answering that question. Would a redesign be worthwhile? How would you go about structuring the urls?

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• EXTEND_MODEL_CASES SQL 2005 workaround

  - by user282382

  Hi, I have a time series based mining model in SQL 2005 Analysis Serveries. I understand in 2008 you can do what if analysis by using EXTEND_MODEL_CASES with a Natural Prediction Join. I'm looking for a workaround or some method of doing the same thing but with 2005. My time series has 3 inputs, and one predict_only. I'd like to use the prediction function to see what types of prediction it makes for 6-12 time intervals in the future with inputs in a separate table. Is there any way to do this or something similar? Thanks

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• Graphical net and text

  - by chesheerkys

  Hello! My task is to make a control, that behaves itself like RichTextBox, but contains a graphical net. The only task, this net is solving, is to be visible. It should be solution in overriding OnPaint method, but it doesn't. This code: protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) { base.OnPaint(e); ...//drawing a line } gives me RichTextBox without of text This code: protected override void WndProc(ref System.Windows.Forms.Message m) { base.WndProc(ref m); if (m.Msg == 15) { Graphics g = this.CreateGraphics(); g.DrawLine(new Pen(Color.White, 1), new Point(0, 0), new Point(400, 400)); } } sometimes draws extra lines Actually since these two ways don't work, I don't know what to try. Waiting for your advices :) BR Dmitry P.S. I’ve heard a lot about great opportunities of WPF, but I’m not really common with this technology and don’t know what to start with. P.P.S. Sorry for my English, it’s not my natural language.

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• ActionScript 3 class over several files - how?

  - by Poni

  So, how do we write a class over several files in action script 3? In C# there's the "partial" keyword. In C++ it's natural (you just "#include ..." all files). In Flex 3, in a component, you add this tag: <mx:Script source="myfile.as"/>. How do I split the following class into several files; package package_path { public class cSplitMeClass { public function cSplitMeClass() { } public function doX():void { // .... } public function doY():void { // .... } } } For example I want to have the doX() and doY() functions implemented in another ".as" file. Can I do this? And please, don't tell me something like "a good practice is to have them in one file" :)

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• Best way for programmers to edit XAML

  - by JessicaB

  I was wondering how programmers chose to edit XAML. Most of the programmers I speak to seem to edit the raw XML, but that seems nuts to me since it is such a natural thing for a more visual editor (of course you often have to get down to the raw code ultimately, but isn't there a better way to lay out a grid, or edit a template, or add non c# triggers or manage commands? The one that really set me off was editing a menu -- Visual Studio 1.0 had a better menu editor for C++ than the raw XAML editing experience.) When I edit .aspx files I use a visual editor much of the time, and then for the raw stuff I get into the html code. I am aware of Expression Blend, but that seems far more focused on artistic types and GUI experts rather than programmers. Does anyone have recommendations for a better editor for XAML than VS? Especially so since VS seems to have real nasty problems with XAML editing too, like bugginess and poor performance? Appreciate your helping this XAML newbie.

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• ZooKeeper and RabbitMQ/Qpid together - overkill or a good combination?

  - by Chris Sears

  Greetings, I'm evaluating some components for a multi-data center distributed system. We're going to be using message queues (via either RabbitMQ or Qpid) so agents can make asynchronous requests to other agents without worrying about addressing, routing, load balancing or retransmission. In many cases, the agents will be interacting with components that were not designed for highly concurrent access, so locking and cross-agent coordination will be needed to avoid race conditions. Also, we'd like the system to automatically respond to agent or data center failures. With the above use cases in mind, ZooKeeper seemed like it might be a good fit. But I'm wondering if trying to use both ZK and message queuing is overkill. It seems like what Zookeeper does could be accomplished by my own cluster manager using AMQP messaging, but that would be hard to get really right. On the other hand, I've seen some examples where ZooKeeper was used to implement message queuing, but I think RabbitMQ/Qpid are a more natural fit for that. Has anyone out there used a combination like this? Thanks in advance, -Chris

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• GNU ld removes section

  - by Jonatan

  I'm writing a boot script for an ARM-Cortex M3 based device. If I compile the assembler boot script and the C application code and then combine the object files and transfer them to my device everything works. However, if I use ar to create an archive (libboot.a) and combine that archive with the C application there is a problem: I've put the boot code in a section: .section .boot, "ax" .global _start _start: .word 0x10000800 /* Initial stack pointer (FIXME!) */ .word start .word nmi_handler .word hard_fault_handler ... etc ... I've found that ld strips this from the final binary (the section "boot" is not available). This is quite natural as there is no dependency on it that ld knows about, but it causes the device to not boot correctly. So my question is: what is the best way to force this code to be included?

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