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John Carmack's Unusual Fast Inverse Square Root (Quake III)
John Carmack has a special function in the Quake III source code which calculates the inverse square root of a float, 4x faster than regular (float)(1.0/sqrt(x)) , including a strange 0x5f3759df constant. See the code below. Can someone explain line by line what exactly is going on here and why t...
In absence of preprocessor macros, is there a way to define practical scheme specific flags at proje
Before swift I would define a set of schemes for alpha, beta, and distribution builds. Each of these schemes would have a set of macros that were defined to gate certain behaviors at the project level. The simplest example is the DEBUG=1 macro that is defined by default for all Xcode projects in t...
fatal error LNK1112: module machine type 'x64' conflicts with target machine type 'X86'
I'm using CUDA (VC++, Visual studio 2008sp1) to debug a FEM program. The program can only run on a Win32 platform, for the insufficiency of cuda. I think the library files linked are all compiled on the x86 platform, but when I compile it, I get the error message "fatal error LNK1112: module machine...
pyplot axes labels for subplots
I have the following plot:
7 Answers
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Get first n characters of a string
How can I get the first n characters of a string in PHP? What's the fastest way to trim a string to a specific number of characters, and append '...' if needed?
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jQuery UI “ $(”#datepicker“).datepicker is not a function”
When i use DatePicker, jQuery's UI plugin, in an existing .aspx page I get errors that:
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How to create a checkbox with a clickable label?
How can I create an HTML checkbox with a label that is clickable (this means that clicking on the label turns the checkbox on/off)?
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Xcode 6 Storyboard the wrong size?
Built a new project from scratch in Swift in Xcode 6 (Beta 1) and have seen some strange behaviour with Storyboards and the output that I am viewing.
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Reading a List from properties file and load with spring annotation @Value
I want to have a list of values in a .properties file, ie:
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Objective-C implicit conversion loses integer precision 'NSUInteger' (aka 'unsigned long') to 'int'
I'm working through some exercises and have got a warning that states:
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