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  • In Haskell, how can you sort a list of infinite lists of strings?

    - by HaskellNoob
    So basically, if I have a (finite or infinite) list of (finite or infinite) lists of strings, is it possible to sort the list by length first and then by lexicographic order, excluding duplicates? A sample input/output would be: Input: [["a", "b",...], ["a", "aa", "aaa"], ["b", "bb", "bbb",...], ...] Output: ["a", "b", "aa", "bb", "aaa", "bbb", ...] I know that the input list is not a valid haskell expression but suppose that there is an input like that. I tried using merge algorithm but it tends to hang on the inputs that I give it. Can somebody explain and show a decent sorting function that can do this? If there isn't any function like that, can you explain why? In case somebody didn't understand what I meant by the sorting order, I meant that shortest length strings are sorted first AND if one or more strings are of same length then they are sorted using < operator. Thanks!

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  • Android: Deciding between SurfaceView and OpenGL (GLSurfaceView)

    - by Rich
    Is there a way to decide up front based on the expected complexity of a game/app in the planning phase whether to use regular Canvas drawing in a SurfaceView or to go with OpenGL? I've been playing around with a Canvas and only need 2D movement, and on a fairly new phone I'm getting pretty decent performance with a bunch of primitive objects and a few bitmaps running around the screen on a solid background. Is it fair to say that if I'm going to be drawing background images and increasing the number of objects being moved and drawn on top of them that I should go straight to OpenGL?

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  • Setting up a non-emacs Common Lisp Dev Env for web application development?

    - by Ravi S
    I am trying to set up a Common Lisp Dev Env for web application development on my Ubuntu 10.04 LTS 64-bit box and I can't find a single decent guide that is targeted at noobs. The closest I came is with Peter Seibel's Lisp in a box but I detest Emacs with a passion and it seems to have older versions of SBCL and CLISP (which are my preferred CL implementations). I do not want to use any of the commercial implementations. I am looking for a simple setup to write some very basic CRUD apps involving possibly hunchentoot, some framework like weblocks,CL-WHO, CL-SQl, sqlite or some datastores from the nosql family like mongo and couch.. Assuming, I go with either SBCL or CLISP on Linux, what is the best tool to manage packages and libraries? ASDF? I am looking for simplicity and consistency and I don't expect to use a ton of libs...

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  • Most useful techniques for two way data binding with js

    - by Perpetualcoder
    With abundance of web services and client side templating features of jQuery and likes, creating mashups or sites consuming a multitude of web services and posting data back to these services is becoming exceedingly popular. For a page of decent size with this kind of architecture, say a dashboard. What are the useful techniques of maintaining this client side state. In other words whats are some of the ways to do two way databinding? Sample scenario: Get Data From Service as JSON/XML Display/Bind on UI Capture User Input Recreate request from the UI controls/html Post Data To Service Get Response and Rebind

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  • measuring performance - using real clicks vs "ab" command

    - by shanyu
    I have a web site in closed beta, developed in Django, runs with Mysql on Debian. In the last few days, the main page has been showing a slowdown. For every ten clicks, one or two receives extremely slow response (10 secs or more), others are as fast as they used to be. When I was searching for the problem, I ran into this issue that I couldn't grasp: top command shows that when I request the main page, mysql shoots up to 90% - 100% cpu usage. I get the page just as the cpu use gets back to normal. So, I thought, it is db. Then I called ab with parameters -n 1000 -c 5, I got decent performance, about 100 pages per second, just as it was before the slowdown. I would imagine a worse performance as 10-20% of requests take 10 secs to load. Is this conflict between ab and "real" clicks normal, or am I using ab in a wrong configuration?

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  • Project management estimating time, budget and product pricing

    - by dr_hoppa
    I have been a software developer for a while but was not interested in the above topics, currently I am put in the position of wanting to learn more about them but don't have a clue where to begin. I have done task estimations and I can do decent ones, but have little/none experience in the field of budget/product pricing and would want to learn more. Do you have any suggestions of good resources that I could look up in order to learn more (eg. books, blogs, ...) This need arised while talking to a friend about management and he brought up management terms that I wasn't aware of (eg. KPI, ...)

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  • Factorial Algorithms in different languages

    - by Brad Gilbert
    I want to see all the different ways you can come up with, for a factorial subroutine, or program. The hope is that anyone can come here and see if they might want to learn a new language. Ideas: Procedural Functional Object Oriented One liners Obfuscated Oddball Bad Code Polyglot Basically I want to see an example, of different ways of writing an algorithm, and what they would look like in different languages. Please limit it to one example per entry. I will allow you to have more than one example per answer, if you are trying to highlight a specific style, language, or just a well thought out idea that lends itself to being in one post. The only real requirement is it must find the factorial of a given argument, in all languages represented. Be Creative! Recommended Guideline: # Language Name: Optional Style type - Optional bullet points Code Goes Here Other informational text goes here I will ocasionally go along and edit any answer that does not have decent formatting.

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  • What are good hosting companies for PHP 5.3 Mysql / CouchDb / MongoDB Dev ( Lithium / CakePHP Framew

    - by Abba Bryant
    I am looking for a quality reliable host for some lithium development. I don't mind a shared platform as long as I have some ssh access. I require php 5.3.x, Mysql 5.x, and the usual imageMagick etc. Non-relational DB support up front would be nice but if they let me set one up myself I would be okay with doing it. I don't need a lot in the way of control panel tools. Good ones are appreciated but bad ones I would prefer not to even deal with. I don't anticipate needing much in the way of email but mail support would be nice to have. Cost isn't a big issue. I don't want to pay an arm and a leg but don't mind paying for what I need. Good support and decent uptime would be nice but I don't need an SLO or anything.

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  • [C#] Async threaded tcp server

    - by mark_dj
    I want to create a high performance server in C# which could take about ~10k clients. Now i started writing a TcpServer with C# and for each client-connection i open a new thread. I also use one thread to accept the connections. So far so good, works fine. The server has to deserialize AMF incoming objects do some logic ( like saving the position of a player ) and send some object back ( serializing objects ). I am not worried about the serializing/deserializing part atm. My main concern is that I will have a lot of threads with 10k clients and i've read somewhere that an OS can only hold like a few hunderd threads. Are there any sources/articles available on writing a decent async threaded server ? Are there other possibilties or will 10k threads work fine ? I've looked on google, but i couldn't find much info about design patterns or ways which explain it clearly

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  • What online brokers offer APIs?

    - by Wilco
    So I'm getting really sick of E*TRADE and, being a developer, would love to find an online broker that offers an API. It would be great to be able to write my own trading tools, and maybe even modify existing ones. Based on my research so far, I've only found one option. Interactive Brokers offers a multi-language API (Java/C++/ActiveX/DDE) and has some fairly decent commission rates to boot. I want to make sure there aren't any other options out there I should be considering. Any ideas? Update: Based on answers so far, here's a quick list... Interactive Brokers Java C++ ActiveX DDE for Excel Pinnacle Trading C++ Perl VB.NET Excel MB Trading

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  • 8051 microcontroller kit recommendation?

    - by LucidDefender
    I'm a first year Computer Science student looking to get started with development for micro-controllers. I'd like to use the 8051, as it's common as dirt, and is used frequently in the real world. During my junior or senior year, I'll be taking a PIC micro-controller based embedded design class, so I'd rather not do PIC now; otherwise, I'll be fairly bored during that course. Most commercial kits I see are for the AVR or PIC series of microprocessors. I'm just looking for something with decent development tools, documentation, and enough add-ons to keep my novice self occupied for the summer. Any recommendations for an 8051 family kit? Thanks!

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  • are there any tree libraries/widgets for (n)curses

    - by phatmanace
    Hi - I wondered if there were any tree libraries available for (n)curses. I'm trying to write a component that shows a tree of folders & was curious if there was a prebuilt curses component that could do this. I've checked 'core' curses as well as libraries like CDK - and I can't seem to find anything. If none exists, I'm not averse to building my own - but I can't seem to locate any decent tutorials on doing this, so any help in this regard would also be much appreciated. Thanks, Ace

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  • Where can I take an online programming aptitude test/exam?

    - by nbolton
    A potential employer requires me to take an online aptitude test before my interview (in this case the test is for C, from Previsor). Where can I take the same (or similar) test so I have a rough idea on what I should brush up on? I've taken a similar test for C++ previously, so I have some idea of what to expect. I've also been studying my C books thoroughly (especially the required material as described in the PDF), but I feel it would be a good idea to get a feel for the particular test before taking it. I did a quick search on Brainbench, but they don't seem to have a C test, unless I'm mistaken (only C++). Note: I'm happy to pay to take a test if no decent free ones are available.

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  • Easiest, free way to start with Flex?

    - by Jon
    I'm interested in getting started with Flex, as I've wanted to work with flash for quite awhile but have never liked the designer-oriented way of programming. I've heard flex can be used for free, and is programmer friendly, but I'm having some issues... I can't find any good sites with flex resources. I'm used to PHP, so maybe I'm spoiled with a full manual, comments and tutorials, but I can't even find a decent tutorial site. So, what are some good flex starts to get started, and what's a good, free IDE to program with?

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  • Windows Azure access POST data

    - by Mohamed Nuur
    Ok, so I can't seem to find decent Windows Azure examples. I have a simple hello world application that's based on this tutorial. I want to have custom output instead of JSON or XML. So I created my interface like: [ServiceContract] public interface IService { [OperationContract] [WebInvoke(UriTemplate = "session/create", Method = "POST")] string createSession(); } public class MyService : IService { public string createSession() { // get access to POST data here: user, pass string sessionid = Session.Create(user, pass); return "sessionid=" + sessionid; } } For the life of me, I can't seem to figure out how to access the POST data. Please help. Thanks!

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  • How do I index documents in SOLR?

    - by Shane
    Hi there, Im running Solr 1.4 on Ubuntu 10.04 (installed via apt-get solr-tomcat) and it seems to be working fine. Im having some difficulty finding any coherent info on how to index documents though. Im new to SOLR so bear with me! I have a folder (/mnt/folder) that is a mounted windows share, which contains Word and PDF files that I would like indexed, whats the easiest way to get SOLR to index the entire folder? The documentation for SOLR is pretty poor, its impossilbe to find any decent tutorials on getting things done with it so any help is greatly appreciated! S

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  • Extracting Information from Images

    - by Khorkrak
    What are some fast and somewhat reliable ways to extract information about images? I've been tinkering with openCV and this seems so far to be the best route plus it has Python bindings. So to be more specific I'd like to determine what I can about what's in an image. So for example the haar face detection and full body detection classifiers are great - now I can tell that most likely there are faces and / or people in the image as well as about how many. okay - what else - how about whether there are any buildings and if so what do they seem to be - huts, office buildings etc? Is there sky visible, grass, trees and so forth. From what I've read about training classifiers to detect objects, it seems like a rather laborious process 10,000 or so wrong images and 5,000 or so correct samples to train a classifier. I'm hoping that there are some decent ones around already instead of having to do this all myself for a bunch of different objects - or is there some other way to go about this sort of thing?

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  • how to debug MySql stored procs without breaking control flow from application

    - by M.Taha Masood
    Is there a way to do the following: I have a MySQL DB , and there are many stored procs written in it as well. I use MySQL client library in C to connect to this DB and amongst other things , call the stored procedures. Is there a way to set breakpoints in the stored procedures such that when the call is made from C program ( using mySql client library ) into the stored proc , then control flow is halted in the C program and we can step into the stored proc called to whatever level of nesting and insspecting variables etc ( like any decent C debugged provides )? Is there ANY way to do the above ? Through some third party tool or the like if not through plain MySql . Help is appreciated. thanks

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  • Is an ORM redundant with a NoSQL API?

    - by Earlz
    Hello, with MongoDB (and I assume other NoSQL database APIs worth their salt) the ways of querying the database are much more simplistic than SQL. There is no tedious SQL queries to generate and such. For instance take this from mongodb-csharp: using MongoDB.Driver; Mongo db = new Mongo(); db.Connect(); //Connect to localhost on the default port. Document query = new Document(); query["field1"] = 10; Document result = db["tests"]["reads"].FindOne(query); db.Disconnect(); How could an ORM even simplify that? Is an ORM or other "database abstraction device" required on top of a decent NoSQL API?

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  • Is ORM (Linq, Hibernate...) really that useful?

    - by Peter
    I have been playing with some LINQ ORM (LINQ directly to SQL) and I have to admit I like its expressive powers . For small utility-like apps, It also works quite fast: dropping a SQL server on some surface and you're set to linq away. For larger apps however, the DAL never was that big of an issue to me to setup, nor maintain, and more often than not, once it was set, all the programming was not happening there anyway... My, honest - I am an ORM newbie - question : what is the big advantage of ORM over writing a decent DAL by hand? (seems like a double, couldn't find it though) UPDATE : OK its a double :-) I found it myself eventually : ORM vs Handcoded Data Access Layer

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  • Is Lightweight Code Generation (LCG) dead?

    - by Greg Beech
    In the .NET 2.0-3.5 frameworks, LCG (aka the DynamicMethod class) was a decent way to emit lightweight methods at runtime when no class structure was needed to support them. In .NET 4.0, expression trees now support statements and blocks, and as such appear to provide sufficient functionality to build just about any functionality you could require from such a method, and can be constructed in a much easier and safer way than directly emitting CIL op-codes. (This statement is borne from today's experimentation of converting some of our most complex LCG code to use expression tree building and compilation instead.) So is there any reason why one would use LCG in any new code? Is there anything it can do that expression trees cannot? Or is it now a 'dead' piece of functionality?

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  • Considering getting into reverse engineering/disassembly

    - by Zombies
    Assuming a decent understanding of assembly on common CPU architectures (eg: x86), how can one explore a potential path (career, fun and profit, etc) into the field of reverse engineering? There is so little educational guides out there so it is difficult to understand what potential uses this has today (eg: is searching for buffer overflow exploits still common, or do stack monitoring programs make this obselete?). I am not looking for any step by step program, just some relevant information such as tips on how to efficiently find a specific area of a program. Basic things in the trade. As well as what it is currently being used for today. So to recap, what current uses does reverse engineering yield today? And how can one find some basic information on how to learn the trade (again it doesn't have to be step-by-step, just anything which can through a clue would be helpful).

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  • Simplest way to use a DatagridView with Linq to SQL

    - by Martín Marconcini
    Hi, I have never used datagrids and such, but today I came across a simple problem and decided to "databind" stuff to finish this faster, however I've found that it doesn't work as I was expecting. I though that by doing something as simple as: var q = from cust in dc.Customers where cust.FirstName == someString select cust; var list = new BindingList<Customer>(q.ToList()); return list; Then using that list in a DataGridView1.DataSource was all that I needed, however, no matter how much I google, I can't find a decent example on how to populate (for add/edit/modify) the results of a single table query into a DataGridView1. Most samples talk about ASP.NET which I lack, this is WinForms. Any ideas? I've came across other posts and the GetNewBindingList, but that doesn't seem to change much. What am I missing (must be obvious)? Thanks in advance. Martin.

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  • How to get an internship with a low GPA?

    - by Jason Baker
    A lot of changed majors and some other mitigating circumstances have left me with a pretty low GPA. My GPA in the last couple of semesters hasn't been stellar, but my grades have gotten a LOT better. I want to try and start putting in some resumes to get a good internship this summer. I do think that I have some decent experience for someone at my level, but I see my GPA being a pretty big potential stumbling block. Is there anything I can do to help my chances of getting a good internship? (For the record, the mitigating circumstances aren't something I'd feel comfortable discussing with a potential employer. I'd prefer getting a job by proving my merit, not making excuses.)

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  • Upload Photo To Album

    - by st4ck0v3rfl0w
    Hello All, I'm trying to familiarize myself with Facebook's new Graph API and so far I can fetch and write some data pretty easily. Something I'm struggling to find decent documentation on is uploading images to an album. According to http://developers.facebook.com/docs/api#publishing you need to supply the message argument. But I'm not quite sure how to construct it. Older resources I've read are: http://wiki.auzigog.com/Facebook_Photo_Uploads http://wiki.developers.facebook.com/index.php/Photos.upload If someone has more information or could help me tackle uploading photos to an album using Facebook Graph API please reply!

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