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John Carmack's Unusual Fast Inverse Square Root (Quake III)
...ulates 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 this works so much faster than the regular implementation?
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Are Javascript arrays sparse?
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edited May 23 '17 at 11:54
Community♦
111 silver badge
answered Oct 2 '09 at 17:21
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How do I base64 encode (decode) in C?
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What's the difference between ASCII and Unicode?
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ASCII defines 128 characters, which map to the numbers 0–127. Unicode defines (less than) 221 characters, which, similarly, map to numbers 0–221 (though not all numbers are currently assigned, and some are reserved).
Unicode is a supe...
multiprocessing: How do I share a dict among multiple processes?
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A general answer involves using a Manager object. Adapted from the docs:
from multiprocessing...
Using switch statement with a range of value in each case?
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Why does C++ rand() seem to generate only numbers of the same order of magnitude?
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There are only 3% of numbers between 1 and 230 which are NOT between 225 and 230. So, this sounds pretty normal :)
Because 225 / 230 = 2-5 = 1/32 = 0.03125 = 3.125%
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NewLine in object summary
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You want to use some thing like this
/// <summary>
/// Your Main comment
/// <par...
How do I find if a string starts with another string in Ruby?
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edited Jan 11 '13 at 23:53
the Tin Man
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An error occurred while installing pg (0.17.1), and Bundler cannot continue
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