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  • Literature and Tutorials for Writing a Ray Tracer

    - by grrussel
    I am interested in finding recommendations on books on writing a raytracer, simple and clear implementations of ray tracing that can be seen on the web, and online resources on introductory raytracing. Ideally, the approach would be incremental and tutorial in style, and explain both the programming techniques and underyling mathematics, starting from the basics.

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  • Regular expressions and matching question marks in URLs

    - by James P.
    I'm having trouble finding a regular expression that matches the following String. Korben;http://feeds.feedburner.com/KorbensBlog-UpgradeYourMind?format=xml;1 One problem is escaping the question mark. Java's pattern matcher doesn't seem to accept \? as a valid escape sequence but it also fails to work with the tester at myregexp.com. Here's what I have so far: ([a-zA-Z0-9])+;http://([a-zA-Z0-9./-]+);[0-9]+ Any suggestions?

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  • How to manually throw a compiler error in GCC and Xcode

    - by coneybeare
    In xcode, while compiling apps with gcc, I want to throw compilation time errors if things like NSZombieEnabled is on for a distribution release, thus ensuring that compilation will fail and I won't accidentally do something stupid. I did some googling, but could not figure out how to cause the compiler to bail if a certain condition is met. Surely it must be easy, am I just not finding it?

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  • rails declarative authorization, permit all actions for controller?

    - by SooDesuNe
    using the delcarative_authorization gem for rails, is there a shortcut to allow a role access to all controller actions? privileges do # default privilege hierarchies to facilitate RESTful Rails apps privilege :manage, :includes => [:create, :read, :update, :delete] end isn't sufficient, because I have more controlling methods than just CRUD in my controllers. Something like: role :foo do has_permission_on :bar, :to =>[:all] end would be perfect, but I'm not finding it in the docs.

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  • Clean checkout from TFS 2008

    - by Luis Medel
    Hi all, I want to pass a project to a colleague without SCC bindings to avoid accidental changes in my repository. Is it possible to do a clean checkout from a TFS 2008 repo? I'm going crazy finding such an option in VS2008. Thanks in advance.

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  • text-align syntax for sifr?

    - by Andre
    I'm having trouble finding usage/syntax for the text-align feature of sifr. This feature goes inside the flashvars parameter correct? So would it be something like: sIFR.replace(fontname, { selector: 'h1', wmode: 'transparent', flashvars: 'textalign=center' }); I tried the above with no luck using r436 build.

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  • JUnit Custom Rules

    - by Jon
    JUnit 4.7 introduced the concept of custom rules: http://www.infoq.com/news/2009/07/junit-4.7-rules There are a number of built in JUnit rules including TemporaryFolder which helps by clearing up folders after a test has been run: @Rule public TemporaryFolder tempFolder = new TemporaryFolder(); There's a full list of built in rules here: http://kentbeck.github.com/junit/javadoc/latest/org/junit/rules/package-summary.html I'm interested in finding out what custom rules are in place where you work or what useful custom rules you currently use?

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  • Anybody using Qi4J

    - by Jon
    I was reading an InfoQ article on Composite Oriented Programming earlier on: http://www.infoq.com/articles/Composite-Programming-Qi4j I was interested in finding out whether anybody is currently using (or has used) the Qi4j framework at all? How does it compares to using a traditional dependency injection framework such as Spring for wiring classes together. Is the resulting object graph (based on mixins rather than classes) easier to deal with from a maintenance point of view?

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  • Regex matching wrong strings

    - by Joe Smalley
    I have this PHP/SQL query: $sql = sprintf("SELECT * FROM %sCubeCart_filemanager WHERE filepath REGEXP '%s[\\/\\\\][^\\/\\\\]+$' AND type = '%d' AND disabled = '0' ORDER BY filepath ASC %s", $this->_config['dbprefix'], str_replace(array('\\','/'),'.',$folder), $type, $limit); if '$folder' == 'iha9' it is finding results like 'iha91' and 'iha99' too. Something is wrong with the regular expression, but I don't know how they work, can anyone help?!

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  • Weird gcc error stray/missing terminating " character in C

    - by DreamCodeR
    I get the following errors: error: missing terminating " character and error: stray `\' in program In this line of C code: system("sqlite3 -html /home/user/.rtcom-eventlogger/el.db \"SELECT service_id, event_type_id,free_text, remote_uid FROM Events WHERE remote_uid=\'%d\' ORDER BY start_time DESC;\" > lol.html", nr); "nr" is a integer variable. I have gone over this so many times but are totally stuck of finding a solution. EDIT: The errors is the ouput while compiling with gcc if I didn't make that clear.

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  • How to find subgroups statistics in pandas?

    - by user2808117
    I am grouping a DataFrame using multiple columns (e.g., columns A, B - my_df.groupby(['A','B']) ), is there a better (less lines of code, faster) way of finding how many rows are in each subgroup and how many subgroups are there in total? at the moment I am using: def get_grp_size(grp): grp['size'] = len(grp) return grp my_df = my_df.groupby(['A','B']).apply(get_grp_size) my_df[['A','B','size']].drop_duplicates().size

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  • Wordpress and Joomla Permalinks plus domain redirect to specific subdirectory on Zeus

    - by moss
    Hi, Here's what I'm trying to do: joomla in 1 subdirectory, wordpress in another. mysite.com directs to the joomla directory mysite.com/blog gives wordpress. I would also like to use seo friendly permalinks for both. I am using Zeus Linux shared hosting with Joomla 1.5 and wordpress 2.9.2, and having a great deal of trouble finding a suitable rewrite script. Any help would be very much appreciated! Thank you.

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  • Does Python/Scipy have a firls( ) replacement (i.e. a weighted, least squares, FIR filter design)?

    - by delicasso
    I am porting code from Matlab to Python and am having trouble finding a replacement for the firls( ) routine. It is used for, least-squares linear-phase Finite Impulse Response (FIR) filter design. I looked at scipy.signal and nothing there looked like it would do the trick. Of course I was able to replace my remez and freqz algorithsm, so that's good. On one blog I found an algorithm that implemented this filter without weighting, but I need one with weights. Thanks, David

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  • HTML File upload field style

    - by Steven1350
    I am trying to create a file upload field that has a little bit of style to it, but I seem to be having problems finding examples of this. I know part of the reason is that the field itself varies from browser to browser. Any ideas how to do this? Or is there a way to do this without using a file element of a form that can be styled?

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  • What’s the ROI of Continuous Integration?

    - by Liggy
    Currently, our organization does not practice Continuous Integration. In order for us to get an CI server up and running, I will need to produce a document demonstrating the return on the investment. Aside from cost savings by finding and fixing bugs early, I'm curious about other benefits/savings that I could stick into this document.

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  • Tools, scripts for working with MS SQL 2008

    - by hgulyan
    Hi, While working with DB, I find useful using some tools, that help me to solve DB problems. Some of them are: 1) Insert generator 2) A tool that can execute a script on a list of DB's 3) Finding a text in stored procedures and functions. 4) DB Back up scripts My question is, what are most useful tools, scripts(anything else), that help you to work with MS SQL? Thanks in advance.

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