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• Web Host which provides Latex and embedded programming [duplicate]

  - by Polymer

  This question already has an answer here: How to find web hosting that meets my requirements? 5 answers Hopefully this is a reasonable place to ask this question. I'll confess I'm a little green when it comes to web programming and websites in general (though not programming). I'm a Math and Physics person. I want to make a personal webpage containing a Math and Physics blog. Ideally the blog should support latex, and embedded programs. This would allow me to write, say, an equation for an orbit and then show what the orbit would look like (perhaps letting the reader configure parameters). The programming language can be javascript (though it isn't my favorite language). My budget is around 5 dollars a month. Does anybody have suggestions for a good Shared host with these kind of requirements? And a small aside, It would be useful if I can move the website content, since I might live at a university in the nearish future. They would have servers which could support such a webpage.

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• PHP usage outside the web?

  - by Anto

  As you probably are aware, PHP is not only usable for web programming, but also desktop programming. It even has things such as GTK bindings. Do you have any examples of places where PHP is actually used outside web programming for anything more than just very trivial programs? Do you know of any desktop program which uses PHP to some extent (e.g. as Python could be used in a C program)? Note: I don't program in PHP myself, I'm just curious

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• Is it worth being computer languages polyglot?

  - by Anton Barkowski

  You can often hear that programmers should learn many different languages to improve themselves. I still go to school and don't have big programming experience (a little more than year). But what was noble intention to improve programming skills turned into some kind of OCD: I feel that I won't calm down until I learn all relatively known programming languages. And here is question itself: Will being programming languages polyglot actually help you (And I don't mean usual "Programmer should know at least all paradigms", I mean really all languages you usually hear about)? Does anybody have similar experience? Does it help with job/skills/career? How often are you able to apply those skills?

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• Performance of concurrent software on multicore processors

  - by Giorgio

  Recently I have often read that, since the trend is to build processors with multiple cores, it will be increasingly important to have programming languages that support concurrent programming in order to better exploit the parallelism offered by these processors. In this respect, certain programming paradigms or models are considered well-suited for writing robust concurrent software: Functional programming languages, e.g. Haskell, Scala, etc. The actor model: Erlang, but also available for Scala / Java (Akka), C++ (Theron, Casablanca, ...), and other programming languages. My questions: What is the state of the art regarding the development of concurrent applications (e.g. using multi-threading) using the above languages / models? Is this area still being explored or are there well-established practices already? Will it be more complex to program applications with a higher level of concurrency, or is it just a matter of learning new paradigms and practices? How does the performance of highly concurrent software compare to the performance of more traditional software when executed on multiple core processors? For example, has anyone implemented a desktop application using C++ / Theron, or Java / Akka? Was there a boost in performance on a multiple core processor due to higher parallelism?

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• Why does this static field always get initialized over-eagerly?

  - by TheSilverBullet

  I am looking at this excellent article from Jon Skeet. While executing the demo code, Jon Skeet says that we can expect three different kinds of behaviours. To quote that article: The runtime could decide to run the type initializer on loading the assembly to start with... Or perhaps it will run it when the static method is first run... Or even wait until the field is first accessed... When I try this out (on framework 4), I always get the first result. That is, the static method is initialized before the assembly is loaded. I have tried running this multiple times and get the same result. (I tried both the debug and release versions) Why is this so? Am I missing something?

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• C#4: Why does this static field always get initialized over-eagerly?

  - by TheSilverBullet

  I am looking at this excellent article from Jon Skeet at this location: http://csharpindepth.com/Articles/General/Beforefieldinit.aspx While executing the demo code, Jon Skeet says that we can expect three different kinds of behaviours. To quote that article: The runtime could decide to run the type initializer on loading the assembly to start with... Or perhaps it will run it when the static method is first run... Or even wait until the field is first accessed... When I try this out (on framework 4), I always get the first result. That is, the static method is initialized before the assembly is loaded. I have tried running this multiple times and get the same result. (I tried both the debug and release versions) Why is this so? Am I missing something?

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• Code Line Delimiter [closed]

  - by John Isaiah Carmona

  Possible Duplicate: Why are statements in many programming languages terminated by semicolons? I just found out that R Programming Language, which is somewhat belong to the C family (I'm not sure about this but it uses {} instead of begin end), uses a new line as a delimiter for a new line of code instead of the semi-colon ;. Why is some programming language designed to use a new line instead of a symbol like semi-colon which I think will make the code more readable? Phyton total = item_one + \ item_two + \ item_three C total = item_one + item_two + item_three;

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• Building a complete program?

  - by Bob

  Reading books, watching videos, and reviewing tutorials is all very easy. Taking notes and actually learning the material may be slightly harder, but even then, anyone with a decent brain and a fair amount of interest, it's easy enough (not to mention, fun). The thing is, it doesn't really prepare you to write a full program or website. Let's say you're those teens (only in highschool, no true (college level) computer science or programming courses, and no real world experience), and you come out with Groupon. Or even Mark Zuckerburg, sure he was a genius, and he was a very capable programmer... but how? How do you recommend that people who are not necessarily new to programming, but new to programming real applications and real programmers go about developing it? What is the "development process" - especially for single programmers (or maybe 2-3 teens)? Also, as far as web development goes, what is the process? Was something like Facebook or Groupon written with a framework (like CodeIgniter or Zend for PHP)? Or do they develop their own frameworks? I'm not asking how to come up with a great idea, but how to implement great ideas in an effective way? Does anyone have advice? I've read a couple of books on both C and C++ (primarily the C Programming Language and the C++ Programming Language) and taken AP Computer Science (as well as read a few additional books on Java and OOP). I also have read a few tutorials on PHP (and CodeIgniter) and Python. But I'm still in highschool, and I'm technically not even old enough to work at an internship for a few more months.

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• Starting small custom development company, type of niches to target?

  - by Rick

  This is kind of a new years thing for me as I want to be more entrepreneurial going forward with programming and this is kind of a general question for anyone who may share the same ambitions as me. I have experience with web programming and, although I work full time for a company doing programming, I have some freelance programmers that I work with / employ for small projects. I want to see about taking things to the next level as far as building a small company doing custom development. I'm just not sure how to figure out what niches to target as far as what type of apps to build as demos, etc. I was thinking mobile (maybe Android or Iphone) but am just curious if anyone has any advice / resources. A lot of "web development" seems to end up being just using a CMS like Joomla or Wordpress, for smaller sites, so I want to figure a way to steer clear of this crowd and find some opportunity with companies / entrepreneurs who actually need real programming development done to build apps. Thanks for any advice

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• Diving into a computer science career [closed]

  - by Willis

  Well first I would like to say thank you for taking the time to read my question. I'll give you some background. I graduated two years ago from a local UC in my state with a degree in cognitive psychology and worked in a neuroscience lab. During this time I was exposed to some light Matlab programming and other programming tidbits, but before this I had some basic understanding of programming. My father worked IT for a company when I was younger so I picked up his books and took learned things along the way growing up. Naturally I'm an inquisitive person, constantly learning, love challenges, and have had exposure to some languages. Yet at this point I was fully pursue it as a career and always had this in the back of my head. Where do I start? I'm 25 and feel like I still have time to make a switch. I've immersed myself in the terminal/command prompt to start, but which language do I focus on? I've read the A+ book and planning to take on the exam, then the networking exam, but I want to deal with more programming, development, and troubleshooting. I understand to get involved in open source, but where? I took the next step and got a small IT assistant job, but doesn't really deal with programming, development, just troubling shooting and small network issues. Thank you!

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• Is there any online programmer's community, focusing on core game development?

  - by kasperov

  I am looking for a stricktly/mostly programming oriented game community, focusing on core graphics, middleware, and research. Any suggestions? Edit: I am specifically looking for people/community/group, having expertise in core game engine design/programming, directx/opengl reservoir.(And specifically targetting the programming part only).(The platforms can be anything from PC to xbox360/ps3/wii and even 3ds.)

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• AppKata - Enter the next level of programming exercises

  - by Ralf Westphal

  Doing CodeKatas is all the rage lately. That´s great since widely accepted exercises are important to further the art. They provide a means of communication across platforms and allow to compare results which is part of any deliberate practice. But CodeKatas suffer from their size. They are intentionally small, so they can be done again and again. Repetition helps to build habit and to dig deeper. Over time ever new nuances of the problem or one´s approach become visible. On the other hand, though, their small size limits the methods, techniques, technologies that can be applied. To improve your TDD skills doing CodeKatas might be enough. But what about other skills? Developing on a software in a team, designing larger pieces of software, iteratively releasing software… all this and more is kinda hard to train using the tiny CodeKata problems. That´s why I´d like to present here another kind of kata I call Application Kata (or just AppKata). AppKatas are larger programming problems. They require the development of “whole” applications, i.e. not just one class or method, but bunches of classes accessible through a user interface. Also AppKata problems always are split into iterations. To get the most out of them, just look at the requirements of one iteration at a time. This way you´re closer to reality where requirements evolve in unexpected ways. So if you´re looking for more of a challenge for your software development skills, check out these AppKatas – or invent your own. AppKatas are platform independent like CodeKatas. Use whatever programming language and IDE you like. Also use whatever approach to software development you like. Just be sensitive to how easy it is to evolve your code across iterations. Reflect on what went well and what not. Compare your solutions with others. Or – for even more challenge – go for the “Coding Carousel” (see below). CSV Viewer An application to view CSV files. Sounds easy, but watch out! Requirements sometimes drastically change if the customer is happy with what you delivered. Iteration 1 Iteration 2 Iteration 3 Iteration 4 Iteration 5 (to come) Questionnaire If you like GUI programming, this AppKata might be for you. It´s about an app to let people fill out questionnaires. Also this problem might be interestin for you, if you´re into DDD. Iteration 1 Iteration 2 (to come) Iteration 3 (to come) Iteration 4 (to come) Tic Tac Toe For developers who like game programming. Although Tic Tac Toe is a trivial game, this AppKata poses some interesting infrastructure challenges. The GUI, however, stays simple; leave any 3D ambitions at home ;-) Iteration 1 Iteration 2 (to come) Iteration 3 (to come) Iteration 4 (to come) Iteration 5 (to come) Coding Carousel There are many ways you can do AppKatas. Work on them alone or in a team, pitch several devs against each other in an AppKata contest – or go around in a Coding Carousel. For the Coding Carousel you need at least 3 dev teams (regardless of size). All teams work on the same iteration at the same time. But here´s the trick: After each iteration the teams swap their code. Whatever they did for iteration n will be the basis for changes another team has to apply in iteration n+1. The code is going around the teams like in a carousel. I promise you, that´s gonna be fun! :-)

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• EJB3 Entity and Lazy Problem

  - by Stefano

  My Entity beAN have 2 list: @Entity @Table(name = "TABLE_INTERNAL") public class Internal implements java.io.Serializable { ...SOME GETTERS AND SETTERS... private List<Match> matchs; private List<Regional> regionals; } mapped one FetchType.LAZY and one FetchType.EAGER : @OneToMany(fetch = FetchType.LAZY,mappedBy = "internal") public List<Match> getMatchs() { return matchs; } public void setMatchs(List<Match> matchs) { this.matchs = matchs; } @ManyToMany(targetEntity = Regional.class, mappedBy = "internals", fetch =FetchType.EAGER) public List<Regional> getRegionals() { return regionals; } public void setRegionals(List<Regional> regionals) { this.regionals = regionals; } I need both lists full ! But I cant put two FetchType.EAGER beacuse it's an error. I try some test: List<Internal> out; out= em.createQuery("from Internal").getResultList(); out= em.createQuery("from Internal i JOIN FETCH i.regionals ").getResultList(); I'm not able to fill both lists...Help!!! Stefano

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• Lazy non-modifiable list in Google Collections

  - by mindas

  I was looking for a decent implementation of a generic lazy non-modifiable list implementation to wrap my search result entries. The unmodifiable part of the task is easy as it can be achieved by Collections.unmodifiableList() so I only need to sort out the the lazy part. Surprisingly, google-collections doesn't have anything to offer; while LazyList from Apache Commons Collections does not support generics. I have found an attempt to build something on top of google-collections but it seems to be incomplete (e.g. does not support size()), outdated (does not compile with 1.0 final) and requiring some external classes, but could be used as a good starting point to build my own class. Is anybody aware of any good implementation of a LazyList? If not, which option do you think is better: write my own implementation, based on google-collections ForwardingList, similar to what Peter Maas did; write my own wrapper around Commons Collections LazyList (the wrapper would only add generics so I don't have to cast everywhere but only in the wrapper itself); just write something on top of java.util.AbstractList; Any other suggestions are welcome.

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• Help me understand entity framework 4 caching for lazy loading

  - by Chris

  I am getting some unexpected behaviour with entity framework 4.0 and I am hoping someone can help me understand this. I am using the northwind database for the purposes of this question. I am also using the default code generator (not poco or self tracking). I am expecting that anytime I query the context for the framework to only make a round trip if I have not already fetched those objects. I do get this behaviour if I turn off lazy loading. Currently in my application I am breifly turning on lazy loading and then turning it back off so I can get the desired behaviour. That pretty much sucks, so please help. Here is a good code example that can demonstrate my problem. Public Sub ManyRoundTrips() context.ContextOptions.LazyLoadingEnabled = True Dim employees As List(Of Employee) = context.Employees.Execute(System.Data.Objects.MergeOption.AppendOnly).ToList() 'makes unnessesary round trip to the database, I just loaded the employees' MessageBox.Show(context.Employees.Where(Function(x) x.EmployeeID < 10).ToList().Count) context.Orders.Execute(System.Data.Objects.MergeOption.AppendOnly) For Each emp As Employee In employees 'makes unnessesary trip to database every time despite orders being pre loaded.' Dim i As Integer = emp.Orders.Count Next End Sub Public Sub OneRoundTrip() context.ContextOptions.LazyLoadingEnabled = True Dim employees As List(Of Employee) = context.Employees.Include("Orders").Execute(System.Data.Objects.MergeOption.AppendOnly).ToList() MessageBox.Show(employees.Where(Function(x) x.EmployeeID < 10).ToList().Count) For Each emp As Employee In employees Dim i As Integer = emp.Orders.Count Next End Sub Why is the first block of code making unnessesary round trips?

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• Lazy non-modifiable list

  - by mindas

  I was looking for a decent implementation of a generic lazy non-modifiable list implementation to wrap my search result entries. The unmodifiable part of the task is easy as it can be achieved by Collections.unmodifiableList() so I only need to sort out the the lazy part. Surprisingly, google-collections doesn't have anything to offer; while LazyList from Apache Commons Collections does not support generics. I have found an attempt to build something on top of google-collections but it seems to be incomplete (e.g. does not support size()), outdated (does not compile with 1.0 final) and requiring some external classes, but could be used as a good starting point to build my own class. Is anybody aware of any good implementation of a LazyList? If not, which option do you think is better: write my own implementation, based on google-collections ForwardingList, similar to what Peter Maas did; write my own wrapper around Commons Collections LazyList (the wrapper would only add generics so I don't have to cast everywhere but only in the wrapper itself); just write something on top of java.util.AbstractList; Any other suggestions are welcome.

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• breadth-first traversal of directory tree is not lazy

  - by user855443

  I try to traverse the diretory tree. A naive depth-first traversal seems not to produce the data in a lazy fashion and runs out of memory. I next tried a breadth first approach, which shows the same problem - it uses all the memory available and then crashes. the code i have is: getFilePathBreadtFirst :: FilePath -> IO [FilePath] getFilePathBreadtFirst fp = do fileinfo <- getInfo fp res :: [FilePath] <- if isReadableDirectory fileinfo then do children <- getChildren fp lower <- mapM getFilePathBreadtFirst children return (children ++ concat lower) return (children ++ concat () else return [fp] -- should only return the files? return res getChildren :: FilePath -> IO [FilePath] getChildren path = do names <- getUsefulContents path let namesfull = map (path </>) names return namesfull testBF fn = do -- crashes for /home/frank, does not go to swap fps <- getFilePathBreadtFirst fn putStrLn $ unlines fps I think all the code is either linear or tail recursive, and I would expect that the listing of filenames starts immediately, but in fact it does not. Where is the error in my code and my thinking? where have I lost lazy evaluation?

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• Model class for NSDictionary information with Lazy Loading

  - by samfu_1

  My application utilizes approx. 50+ .plists that are used as NSDictionaries. Several of my view controllers need access to the properties of the dictionaries, so instead of writing duplicate code to retrieve the .plist, convert the values to a dictionary, etc, each time I need the info, I thought a model class to hold the data and supply information would be appropriate. The application isn't very large, but it does handle a good deal of data. I'm not as skilled in writing model classes that conform to the MVC paradigm, and I'm looking for some strategies for this implementation that also supports lazy loading.. This model class should serve to supply data to any view controller that needs it and perform operations on the data (such as adding entries to dictionaries) when requested by the controller functions currently planned: returning the count on any dictionary adding one or more dictionaries together Currently, I have this method for supporting the count lookup for any dictionary. Would this be an example of lazy loading? -(NSInteger)countForDictionary: (NSString *)nameOfDictionary { NSBundle *bundle = [NSBundle mainBundle]; NSString *plistPath = [bundle pathForResource: nameOfDictionary ofType: @"plist"]; //load plist into dictionary NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] initWithContentsOfFile: plistPath]; NSInteger count = [dictionary count] [dictionary release]; [return count] }

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• Stop lazy-loading images?

  - by Greg

  Here's the issue – I followed along with the Apple lazy-load image sample code to handle my graphical tables. It works great. However, my lazy-load image tables are being stacked within a navigation controller so that you can move in and out of menus. While all this works, I'm getting a persistent crash when I move into a table then move immediately back out of it using the "back" button. This appears to be a result of the network connections loading content not being closed properly, or calling back to their released delegates. Now, I've tried working through this and carefully setting all delegates to nil and calling close on all open network connections before releasing a menu. However, I'm still getting the error. Also – short posting my entire application code into this post, I can't really post a specific code snippet that illustrates this situation. I wonder if anyone has ideas for tasks that I may be missing? Do I need to do anything to close a network connection other than closing it and setting it to nil? Also, I'm new to debugging tools – can anyone suggest a good tool to use to watch network connections and see what's causing them to fail? Thanks!

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• Which programming language is manageable by an 11 year old kid?

  - by tangens

  Possible Duplicates: What is the easiest language to start with? What are some recommended programming resources for pre-teens? My son is 11 years old and he would like to learn a programming language. Of course his primary goal is to develop some (simple) games. Do you know of a programming language that is suitable for this situation? Summary of languages recommended in the answers Snake Wrangling for Kids (answer) Scratch (answer) Small Basic (answer) (answer) Logo NXT-G for Lego Mindstorms (answer) Alice (answer) BlueJ (answer) Squeak Smalltalk (answer) (answer) (answer) Blender Game Engine (answer) PyGame (answer) (answer) (answer) Inform (answer) Phrogram (answer) Dr Scheme (answer) eToys (answer) runrev (answer) Karel Programming (answer) Hackety Hack (answer) Visual Basic (answer) (answer) Learn to Program (answer) QBasic (answer) (answer) Visual Basic Express (answer) Processing (answer) C# (answer) JavaScript (answer) (answer) Ruby (answer) ToonTalk (answer) Flash and ActionScript (answer) StarLogo (answer) Java (answer) Kodu (answer) XNA (answer) (answer) unity3D (answer) BlitzBasic (answer)(answer) Lua (answer)

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• What trivial real-life example do you use to explain programming to total non-programmers?

  - by anon

  Programmers seem to live in a world of their own (as this site indicates), with their own vibrant culture - and their own premises and vocabulary. Once we've been in the field for a bit, we take a lot of things for granted. But I'm often faced with the question "What do you do?" Or "What is programming?" I generally try to answer this with a small, often trivial, real-world example of how programming is prevalent in our everyday lives and keeps things running. The example I use most often is an elevator - someone has to program the logic of that... And I've seen elevators that are "smart" and ones that are quite backwards and foolish. (And you can easily understand if/decision and looping from that... incorporates a lot of important programming concepts in a very small example.) I've sometimes heard people use traffic lights as an example. What example do you / would you use to explain the concept of programming to someone completely clueless?

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• Have I taken a wrong path in programming by being excessively worried about code elegance and style?

  - by Ygam

  I am in a major stump right now. I am a BSIT graduate, but I only started actual programming less than a year ago. I observed that I have the following attitude in programming: I tend to be more of a purist, scorning unelegant approaches to solving problems using code I tend to look at anything in a large scale, planning everything before I start coding, either in simple flowcharts or complex UML charts I have a really strong impulse on refactoring my code, even if I miss deadlines or prolong development times I am obsessed with good directory structures, file naming conventions, class, method, and variable naming conventions I tend to always want to study something new, even, as I said, at the cost of missing deadlines I tend to see software development as something to engineer, to architect; that is, seeing how things relate to each other and how blocks of code can interact (I am a huge fan of loose coupling) i.e the OOP thinking I tend to combine OOP and procedural coding whenever I see fit I want my code to execute fast (thus the elegant approaches and refactoring) This bothers me because I see my colleagues doing much better the other way around (aside from the fact that they started programming since our first year in college). By the other way around I mean, they fire up coding, gets the job done much faster because they don't have to really look at how clean their codes are or how elegant their algorithms are, they don't bother with OOP however big their projects are, they mostly use web APIs, piece them together and voila! Working code! CLients are happy, they get paid fast, at the expense of a really unmaintainable or hard-to-read code that lacks structure and conventions, or slow executions of certain actions (which the common reasoning against would be that internet connections are much faster these days, hardware is more powerful). The excuse I often receive is clients don't care about how you write the code, but they do care about how long you deliver it. If it works then all is good. Now, did my "purist" approach to programming may have been the wrong way to start programming? Should I just dump these purist concepts and just code the hell up because I have seen it: clients don't really care how beautifully coded it is?

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• Are there programming languages taht rely on non-latin alphabets?

  - by Jaxsun

  Every programming language I have ever seen has been based on the Latin alphabet, this is not surprising considering I live in Canada... But it only really makes sense that there would be programming languages based on other alphabets, or else bright computer scientists across the world would have to learn a new alphabet to go on in the field. I know for a fact that people in countries dominated by other alphabets develop languages based off the Latin alphabet (eg. Ruby from Japan), but just how common is it for programming languages to be based off of other alphabets like Arabic, or Cyrillic, or even writing systems which are not alphabetic but rather logographic in nature such as Japanese Kanji? Also are any of these languages in active widespread use, or are they mainly used as teaching tools? This is something that has bugged me since I started programming, and I have never run across someone who could think of a real answer.

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• Are there programming languages that rely on non-latin alphabets?

  - by Jaxsun

  Every programming language I have ever seen has been based on the Latin alphabet, this is not surprising considering I live in Canada... But it only really makes sense that there would be programming languages based on other alphabets, or else bright computer scientists across the world would have to learn a new alphabet to go on in the field. I know for a fact that people in countries dominated by other alphabets develop languages based off the Latin alphabet (eg. Ruby from Japan), but just how common is it for programming languages to be based off of other alphabets like Arabic, or Cyrillic, or even writing systems which are not alphabetic but rather logographic in nature such as Japanese Kanji? Also are any of these languages in active widespread use, or are they mainly used as teaching tools? This is something that has bugged me since I started programming, and I have never run across someone who could think of a real answer.

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• Are there still completely new programming languages and -paradigms to be born?

  - by llasa

  Are there still completely new programming languages and -paradigms (which will actually go mainstream and still be used decades after their appearance) to be born? What I'm talking about are groundbreaking things like the rise of object oriented programming, C++, or PHP. With new programming languages I mean that they actually are completely different from what you know, as different as when you set a guy who used assembler for a decade, and even programmed some kind of 3D game in it, in front of something as high-level as PHP, Ruby or Python? Which new paradigms and programming languages are there to come? What could be different about them? Who will possibly create them and how fast will they rise?

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