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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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How to get one value at a time from a generator function in Python?
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157
Yes, or next(gen) in 2.6+.
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What are 'get' and 'set' in Swift?
...e variable from another object, it looks like this:
myTriangle.perimeter = 100
Which invokes the code in the set{} block:
set {
sideLength = newValue / 3.0
}
And so it's like if the class that's setting the variable had done this:
myTriangle.sideLength = 100/3.0
It's really just for convenien...
what is .netrwhist?
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118
netrw is a kind of vim plugin/script which supports reading and writing files across networks....
Can jQuery get all CSS styles associated with an element?
... var l = css[i].split(": ");
s[l[0].toLowerCase()] = (l[1]);
}
}
return s;
}
Pass a jQuery object into css() and it will return an object, which you can then plug back into jQuery's $().css(), ex:
var style = css($("#elementToGetAllCSS"));
$("#elementToPutStyleI...
Convert numpy array to tuple
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161
>>> arr = numpy.array(((2,2),(2,-2)))
>>> tuple(map(tuple, arr))
((2, 2), (2...
Check if bash variable equals 0 [duplicate]
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194
Looks like your depth variable is unset. This means that the expression [ $depth -eq $zero ] b...
How would one call std::forward on all arguments in a variadic function?
...g the boost preprocessor meta-library to make a variadic template (using 2010 and it doesn't support them). My function uses rval references and std::forward to do perfect forwarding and it got me thinking...when C++0X comes out and I had a standard compiler I would do this with real variadic temp...
Ruby sleep or delay less than a second?
...h ruby that must render frames at 24 frames per second, but I need to wait 1/24th of a second between sending the commands. What is the best way to sleep for less than a second?
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