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• Dynamically vs Statically typed languages studies

  - by Winston Ewert

  Do there exist studies done on the effectiveness of statically vs dynamically typed languages? In particular: Measurements of programmer productivity Defect Rate Also including the effects of whether or not unit testing is employed. I've seen lots of discussion of the merits of either side but I'm wondering whether anyone has done a study on it. Edit Sadly, only one of the papers shown is actually a study and it does nothing but conclude that the language matters. This leads me to ponder: what if I proposed doing such a study with volunteers from this site?

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• How can I generate signed distance fields in real time, fast?

  - by heishe

  In a previous question, it was suggested that signed distance fields can be precomputed, loaded at runtime and then used from there. For reasons I will explain at the end of this question (for people interested), I need to create the distance fields in real time. There are some papers out there for different methods which are supposed to be viable in real-time environments, such as methods for Chamfer distance transforms and Voronoi diagram-approximation based transforms (as suggested in this presentation by the Pixeljunk Shooter dev guy), but I (and thus can be assumed a lot of other people) have a very hard time actually putting them to use, since they're usually long, largely bloated with math and not very algorithmic in their explanation. What algorithm would you suggest for creating the distance fields in real-time (favourably on the GPU) especially considering the resulting quality of the distance fields? Since I'm looking for an actual explanation/tutorial as opposed to a link to just another paper or slide, this question will receive a bounty once it's eligible for one :-). Here's why I need to do it in real time:

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• MIX10 Windows Phone 7 Content Overview

  The tools available at MIX 10 and for public download are a Community Technology Preview, while not feature complete, the tools release at MIX 10 ships with a robust set of functionality. The white papers provide guidance on architecture, development, as well as design. In addition there are code samples and hands-on-labs that cover key topics such as Silverlight, the application bar, splash screen, navigation model, and XNA Game Studio. Training available now: Charles Petzolds preview of Programming...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Teaching: How can you motivate students to comment?

  - by keflavich

  I remember when I was taught, "comments are the most important part of code." Or rather, when I was told that comments are the most important part of the code. I don't think I was convinced, and I still see common cases where programmers are not convinced of the necessity of good & thorough comments. I am certainly convinced myself at this point - trying to read, in particular, complex formulae that call functions that call other functions that I don't understand - but I don't know how to convey this to students.

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• Using "prevent execution of method" flags

  - by tpaksu

  First of all I want to point out my concern with some pseudocode (I think you'll understand better) Assume you have a global debug flag, or class variable named "debug", class a : var debug = FALSE and you use it to enable debug methods. There are two types of usage it as I know: first in a method : method a : if debug then call method b; method b : second in the method itself: method a : call method b; method b : if not debug exit And I want to know, is there any File IO or stack pointer wise difference between these two approaches. Which usage is better, safer and why?

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• Improving exception handling ?

  - by n00b

  Hello, I am a newbie programmer and I recently started learning about exception handling in Java. I know what try, catch and finally blocks do, but I really need to understand how to use them well and where to handle something in the call stack... I have a project right now that involves I/O and all I'm doing is handling the exception in the lowest possible method in the call stack. I'm sure my exception handling can be improved, so I'm asking you guys how you think of exception handling? How did you guys get good at this and how can I better wrap my head around this idea?

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• I Purchased a Domain that Previously had a Google Apps Account. How Do I Re-Create The Google Apps Account or Take Ownership of it?

  - by jmort253

  I recently purchased a domain name. We'll call it example.com. The previous owner of the domain had a Google Apps account. Now that I own the domain, I want to create a Google Apps account so I can point the domain www.example.com to one of my Google App Engine domains. We'll call it application.appspot.com. Google App Engine won't allow me to add the domain without verifying ownership by creating a Google Apps account or logging into Google Apps, but I don't have access to the old Google Apps account. We've tried going to this address to take ownership: https://www.google.com/a/cpanel/example.com/ResetAdminPassword?c=LONG_KEY&hl=en_US We retrieved a new password, but it wouldn't tell us what the login name is. How do you find out the login name?

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• Switching Programming Languages

  - by no spoon

  Hi I'm a senior level Delphi developer looking for move into either C# or possibly Java roles. I have around 8 years of development experience of which pretty much all of it is in Delphi, I have very little commercial experience in C# and no commercial experience in Java. I have about 6 months worth of academic experience in both Java and C# from some University papers I took a 4 years ago and use these languages for hobby projects, so I know the languages I just don't have the commercial experience to back it up. Given that I'm too over qualified for a junior role but do not have the commercial experience for even an intermediate role how does one go about changing jobs?

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• Best practices for upgrading user data when updating versions of software

  - by Javy

  In my code I check the current version of the software on launch and compare it to the version stored in the user's data file(s). If the version is newer, then I call different methods to update the old data to the newer data version, if necessary. I usually have to make a new method to convert the data with each update that changes user data in some way, and cannot remove the old ones in case there was someone who missed an update. So the app must be able to go through each method call and update their data until they get their data current. With larger data sets, this could be a problem. In addition, I recently had a brief discussion with another StackOverflow user this and he indicated he always appended a date stamp to the filename to manage data versions, although his reasoning as to why this was better than storing the version data in the file itself was unclear. Since I've rarely seen management of user data versions in books I've read, I'm curious what are the best practices for naming user data files and procedures for updating older data to newer versions.

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• Is it a good approach to rely on 3rd party software ( not library )?

  - by gunbuster363

  We have program using a call to a winzip program or 7zip commandline tool to zip some files. Once I accidentally uninstall winzip on my computer and making one of our program( created by the programmer already left ) crashed. So we cannot uninstall the winzip program. Now I've come to a point which I need to decide a external tool for gzip in windows or I make a java program which I can call to gzip the file. Obviously a external tool such as 7z is convenient and we can avoid some extra coding with java. On the contrary, if 7z is uninstalled accidentally, our program will crash. What do you think?

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• How to detect GLSL warnings?

  - by msell

  After compiling a shader with glCompileShader, I can call glGetShaderiv with GL_COMPILE_STATUS to check if the shader compiled successfully. I can also call glGetShaderInfoLog to get information about possible errors, warnings or other info. The information log returned by this function is unspecified. In a tool where users can write their own shaders, I would like to print all errors and warnings from the compilation, but nothing if no warnings or errors were found. The problem is that the GL_COMPILE_STATUS returns only false if the compilation failed and true otherwise. If no problems were found, some drivers return empty info log from glGetShaderInfoLog, but some drivers can return something else such as "No errors.", which I do not want to print to the user. How is this problem generally solved?

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• CMake can not find PythonLibs

  - by tintin

  I am trying to build inria Graphite on my ubuntu which is running in a VirtualBox simulator, I follow the instructions, and install the python-dev packages, but when I run cmake , still got an error: CMake Error at /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:108 (message): Could NOT find PythonLibs (missing: PYTHON_LIBRARIES PYTHON_INCLUDE_DIRS) (Required is at least version "3.2") Call Stack (most recent call first): /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:315 (_FPHSA_FAILURE_MESSAGE) /usr/share/cmake-2.8/Modules/FindPythonLibs.cmake:208 (FIND_PACKAGE_HANDLE_STANDARD_ARGS) src/packages/OGF/gel_python3/CMakeLists.txt:11 (FIND_PACKAGE) I checked the /usr/lib/ and find tintin@tintin-VirtualBox:/usr/lib$ find . -name "libpython*" ./x86_64-linux-gnu/libpython3.4m.so.1.0 ./x86_64-linux-gnu/libpython2.7.so.1.0 ./x86_64-linux-gnu/libpython3.4m.a ./x86_64-linux-gnu/libpython2.7.a ./x86_64-linux-gnu/libpython3.4m.so ./x86_64-linux-gnu/libpython2.7.so ./x86_64-linux-gnu/libpython2.7.so.1 ./x86_64-linux-gnu/libpython3.4m.so.1 so why cmake can not find the PythonLibs, or how should I deal with this?

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• Python simulation-scripts architecture

  - by Beastcraft

  Situation: I've some scripts that simulate user-activity on desktop. Therefore I've defined a few cases (workflows) and implemented them in Python. I've also written some classes for interacting with the users' software (e.g. web browser etc.). Problem: I'm a total beginner in software design / architecture (coding isn't a problem). How could I structure what I described above? Providing a library which contains all the workflows as functions, or a separate class/module etc. for each workflow? I want to keep the the workflows simple. The complexity should be hidden in the classes for interacting with the users' software. Are there any papers / books I could read about this, or could you provide some tips? Kind regards, B

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• PeopleTools Collateral Available

  - by Matthew Haavisto

  We've posted a lot of documentation including presentations, white/red papers, data sheets, and other useful collateral on Oracle.com, a public site.  If you are seeking detailed information on a particular topic, this is a good place to start.  It's a bit hard to find so I'm posting it here. This resource library contains collateral on general PeopleTools, user experience and interaction--including the PeopleSoft Interaction Hub, platforms, security, life-cycle management, reporting and analytics, integration, and accessibility.  There are also links to video feature overviews, viewlets, and appcasts, and the latest release information. There is much valuable information here, so if you need information about PeopleTools and related information, start here.

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• Microphone problem in Ubuntu 11.10

  - by Teja

  I am using both Windows 7 and Ubuntu 11.10 on a single system with the same hardware. While I'm making call through Gmail or Skype my voice is audible to others while I'm on Windows 7, but while I'm on Ubuntu 11.10 it's not audible to others, but I am able to hear their voice. But while I'm playing music on Ubuntu along with a call, the others are able to hear the music, but my voice is not audible for them. Please give me a solution for this and tell me where I can change the microphone settings on Ubuntu 11.10.

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• Strange 401 (Unauthorized) when calling a WCF Service

  - by mipsen

  A WCF Service we call from BizTalk using WCF BasicHTTP usually works fine but all of a sudden it started returning 401 errors for some calls while others continued working as expected so it could not have been a "real" 401. The difference was the size of the message. One parameter of the service is a rather complex object. In the cases we got a 401 it got quite big (containing a lot of customer-data), say 5 MB. So we turned on tracking. The messages we traced out where about 20MB. Not too big for WCF one should suppose... A bit of research led us to increasing maxItemsInObjectGraph in the behaviours but that did not help. The service we call is in the same network as we are and is a WCF service. So we tried changing from BasicHTTP to net.tcp and Bingo! Ok, we had to use CustomBinding in BizTalk to set all the Quotas, etc. but it worked in the end.

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• What factors influence you to try out a new framework or tool?

  - by VirtuosiMedia

  I'm in the process of putting the final touches on an open-source framework that I hope to release in the next few months. It's something that I'd like to develop a community for and so I'm curious about what factors influence your decision to use a new framework or tool and why. Some of the specific things I'd like to know more about (feel free to add to this): Types of documentation/tutorials/instruction Community support (comments/forum) Updates (blog/social media/feeds) Look and feel of the project website design White papers/testimonials A big feature list Community size Tools Ability to contribute Project test coverage (stability/security) Level of buzz (recommended by friends or around the web) Convincing marketing copy Ideally, I'd like to have all of the above, but what specific features/qualities will carry greater weight in getting programmers to adopt something new? What says, 'This is a professional-grade project,' and what are red flags that keep you from trying it out?

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• What is a *slightly* less extreme equivalent to being "fluent" in a language?

  - by Mehrdad

  tl;dr: What is a less extreme (but still noticeable) alternative to the word "fluent", when saying e.g. "I am fluent in C++/Python/whatever?" I think I can call myself "fluent" in C#, because I know the language and runtime very well, and I'm very familiar with the .NET framework's APIs and classes, etc. I would like to claim the same thing for Python and C++. But while I can program in Python (I did so for an entire summer, making a website with Django), for example, I would not call myself fluent because my code isn't always "Pythonic" (e.g. using map/filter vs. list comprehensions), and I'm not too intimate with some aspects of the language and standard library yet (e.g. the introspection API, etc.). Is there a word or phrase I can use on e.g. a resume to describe what I know? I can think of "very familiar with", but is there a better word/phrase I can use?

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• what is the purpose of arrows?

  - by Simon

  I am learning functionnal programming with Haskell, and I try to grab concepts by first understanding why do I need them. I would like to know the goal of arrows in functional programming languages. What problem do they solve? I checked http://en.wikibooks.org/wiki/Haskell/Understanding_arrows and http://www.cse.chalmers.se/~rjmh/afp-arrows.pdf. All I understand is that they are used to describe graphs for computations, and that they allow easier point free style coding. The article assume that point free style is generally easier to understand and to write. This seems quite subjective to me. In another article (http://en.wikibooks.org/wiki/Haskell/StephensArrowTutorial#Hangman:_Main_program), a hangman game is implemented, but I cannot see how arrows makes this implementation natural. I could find a lot of papers describing the concept, but nothing about the motivation. What I am missing?

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• Should concrete classes avoid calling other concrete classes, except for data objects?

  - by Kazark

  In Appendix A to The Art of Unit Testing, Roy Osherove, speaking about ways to write testable code from the start, says, An abstract class shouldn't call concrete classes, and concerete classes shouldn't call concrete classes either, unless they're data objects (objects holding data, with no behavior). (259) The first half of the sentence is simply Dependency Inversion from SOLID. The second half seems rather extreme to me. That means that every time I'm going to write a class that isn't a simple data structure, which is most classes, I should write an interface or abstract class first, right? Is it really worthwhile to go that far in defining abstract classes an interfaces? Can anyone explain why in more detail, or refute it in spite of its benefit for testability?

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• How can I instruct nautilus to pre-generate thumbnails?

  - by Glutanimate

  I have a large library of PDF documents (papers, lectures, handouts) that I want to be able to quickly navigate through. For that I need thumbnails. At the same time however, I see that the ~/.thumbnails folder is piling up with thumbs I don't really need. Deleting thumbnail junk without removing the important thumbs is impossible. If I were to delete them, I'd have to go to each and every folder with important PDF documents and let the thumbnail cache regenerate. I would love to able to automate this process. Is there any way I can tell nautilus to pre-cache the thumbs for a set of given directories? Note: I did find a set of bash scripts that appear to do this for pictures and videos, but not for any other documents. Maybe someone more experienced with scripting might be able to adjust these for PDF documents or at least point me in the right direction on what I'd have to modify for this to work with PDF documents as well.

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• Java Phones: How to set up JTAPI?

  - by Adam Tannon

  I want to use JTAPI (1.4 - latest) to create an app that will call my phone whenever I need it to. I downloaded JSR043 (JTAPI specification) and have been reading the API docs and it seems pretty straight forward with respect to how to code JTAPI. However I seriously doubt that getting a Java app on my laptop to call my cell phone doesn't require some 3rd party or middle man service provider and possibly other entities/configurations as well. So I ask: besides using the JTAPI in my Java code, what do I need to install or set up to have a Java app that calls my phone? Thanks in advance!

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• Passing functions into other functions as parameters, bad practice?

  - by BlueHat

  We've been in the process of changing how our AS3 application talks to our back end and we're in the process of implementing a REST system to replace our old one. Sadly the developer who started the work is now on long term sick leave and it's been handed over to me. I've been working with it for the past week or so now and I understand the system, but there's one thing that's been worrying me. There seems to be a lot of passing of functions into functions. For example our class that makes the call to our servers takes in a function that it will then call and pass an object to when the process is complete and errors have been handled etc. It's giving me that "bad feeling" where I feel like it's horrible practice and I can think of some reasons why but I want some confirmation before I propose a re-work to system. I was wondering if anyone had any experience with this possible problem?

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• Flowchart with subroutine

  - by Jordy

  I am not really sure how to correctly describe my question, so please forgive me if this is a duplicate. I am creating a flowchart for my program where I implement a method. Let's assume I call this method someMethod. The C code could look something like this: bool someMethod(int Foo, int Bar) { foo += 5; bar -= 5; return (foo == bar); } This means that my flowchart will have a subroutine block where I call this function. But how do I correctly show the reader which integers I pass? And when I create the flowchart of "someMethod", I face a similar problem: how do I correctly show the reader that Foo and Bar are passed parameters?

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• Passing class names or objects?

  - by nischayn22

  I have a switch statement switch ( $id ) { case 'abc': return 'Animal'; case 'xyz': return 'Human'; //many more } I am returning class names,and use them to call some of their static functions using call_user_func(). Instead I can also create a object of that class, return that and then call the static function from that object as $object::method($param) switch ( $id ) { case 'abc': return new Animal; case 'xyz': return new Human; //many more } Which way is efficient? To make this question broader : I have classes that have mostly all static methods right now, putting them into classes is kind of a grouping idea here (for example the DB table structure of Animal is given by class Animal and so for Human class). I need to access many functions from these classes so the switch needs to give me access to the class

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