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How to use glOrtho() in OpenGL?

I can't understand the usage of glOrtho . Can someone explain what it is used for? 3 Answers ...
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Trees in Twitter Bootstrap [closed]

I have been trying to work on creating a tree (like a directory tree) that uses as much CSS and as little JS as possible (only for states, etc), and I want to know if there are some good existing tree plugins for bootstrap or jquery-ui bootstrap . ...
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Is MATLAB OOP slow or am I doing something wrong?

I'm experimenting with MATLAB OOP , as a start I mimicked my C++'s Logger classes and I'm putting all my string helper functions in a String class, thinking it would be great to be able to do things like a + b , a == b , a.find( b ) instead of strcat( a b ) , strcmp( a, b ) , retrieve first...
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Does ruby have real multithreading?

I know about the "cooperative" threading of ruby using green threads . How can I create real "OS-level" threads in my application in order to make use of multiple cpu cores for processing? ...
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Regular expression to match URLs in Java

I use RegexBuddy while working with regular expressions. From its library I copied the regular expression to match URLs. I tested successfully within RegexBuddy. However, when I copied it as Java String flavor and pasted it into Java code, it does not work. The following class prints false : ...
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How do you know what to test when writing unit tests? [closed]

Using C#, I need a class called User that has a username, password, active flag, first name, last name, full name, etc. ...
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When should I use Lazy?

I found this article about Lazy : Laziness in C# 4.0 – Lazy 7 Answers 7 ...
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Circle drawing with SVG's arc path

Short question: using SVG path, we can draw 99.99% of a circle and it shows up, but when it is 99.99999999% of a circle, then the circle won't show up. How can it be fixed? ...
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For i = 0, why is (i += i++) equal to 0?

Take the following code (usable as a Console Application): 24 Answers 24 ...
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Difference between map, applymap and apply methods in Pandas

Can you tell me when to use these vectorization methods with basic examples? 10 Answers ...