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Run an OLS regression with Pandas Data Frame
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I think you can almost do exactly what you thought would be ideal, using the statsmodels packa...
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 insert newline in string literal?
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How do I retrieve the number of columns in a Pandas data frame?
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Like so:
import pandas as pd
df = pd.DataFrame({"pear": [1,2,3], "apple": [2,3,4], "orange": [...
Modulo operation with negative numbers
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How to echo or print an array in PHP?
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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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Scala 2.8 breakOut
...e the best builder possible. For example, if I were to write Map('a' -> 1).map(_.swap), I'd like to get a Map(1 -> 'a') back. On the other hand, a Map('a' -> 1).map(_._1) can't return a Map (it returns an Iterable).
The magic of producing the best possible Builder from the known types of t...
Using build types in Gradle to run same app that uses ContentProvider on one device
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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...