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Which is faster in Python: x**.5 or math.sqrt(x)?
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14 Answers
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Rails mapping array of hashes onto single hash
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163
You could compose Enumerable#reduce and Hash#merge to accomplish what you want.
input = [{"te...
Why use make over a shell script?
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132
The general idea is that make supports (reasonably) minimal rebuilds -- i.e., you tell it what...
Why does multiprocessing use only a single core after I import numpy?
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150
After some more googling I found the answer here.
It turns out that certain Python modules (n...
Appending to an empty DataFrame in Pandas?
...ata = pd.DataFrame({"A": range(3)})
>>> df.append(data)
A
0 0
1 1
2 2
But the append doesn't happen in-place, so you'll have to store the output if you want it:
>>> df
Empty DataFrame
Columns: []
Index: []
>>> df = df.append(data)
>>> df
A
0 0
1 1
2 ...
Retina displays, high-res background images
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185
Do I need to double the size of the .box div to 400px by 400px to
match the new high res ...
git: Apply changes introduced by commit in one repo to another repo
I have a repo1 and repo2 on local machine. They are very similar, but the latter is some kind of other branch ( repo1 is not maintained anymore).
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Scala constructor overload?
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186
It's worth explicitly mentioning that Auxiliary Constructors in Scala must either call the pri...
R programming: How do I get Euler's number?
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150
The R expression
exp(1)
represents e, and
exp(2)
represents e^2.
This works because exp...
Insert a line at specific line number with sed or awk
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edited Nov 9 '14 at 0:18
answered Jun 30 '11 at 15:54
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