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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 do I retrieve the number of columns in a Pandas data frame?
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312
Like so:
import pandas as pd
df = pd.DataFrame({"pear": [1,2,3], "apple": [2,3,4], "orange": [...
How to get a variable name as a string in PHP?
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edited Nov 1 '08 at 1:11
answered Nov 1 '08 at 0:42
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Best way to represent a fraction in Java?
...arable<BigFraction>
{
private static final long serialVersionUID = 1L; //because Number is Serializable
private final BigInteger numerator;
private final BigInteger denominator;
public final static BigFraction ZERO = new BigFraction(BigInteger.ZERO, BigInteger.ONE, true);
public fin...
How to right align widget in horizontal linear layout Android?
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18 Answers
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For i = 0, why is (i += i++) equal to 0?
...; // i=0 because the ++ is a postfix operator and hasn't been executed
i + 1; // Note that you are discarding the calculation result
What actually happens is more involved than that - take a look at MSDN, 7.5.9 Postfix increment and decrement operators:
The run-time processing of a postfix inc...
Rails 4 LIKE query - ActiveRecord adds quotes
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edited Dec 10 '15 at 19:48
Ian Vaughan
17k1111 gold badges5252 silver badges6868 bronze badges
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How to create a temporary directory?
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answered Jan 8 '11 at 2:30
moinudinmoinudin
111k4141 gold badges182182 silver badges212212 bronze badges
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Using build types in Gradle to run same app that uses ContentProvider on one device
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14 Answers
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