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Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
... return A1, A2
%timeit df['A1'], df['A2'] = power(df['a'])
72.7 ms ± 2.16 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
Directly assigning without apply
You can get even greater speed improvements if you use the direct vectorized operations.
%timeit df['A1'], df['A2'] = df['a'] ...
How to manually install an artifact in Maven 2?
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answered Mar 3 '09 at 16:45
David DurhamDavid Durham
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git add remote branch
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edited Jun 28 '17 at 16:18
Community♦
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answered Jun 29 '12 at 18:26
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Convert Python dictionary to JSON array
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168
If you are fine with non-printable symbols in your json, then add ensure_ascii=False to dumps ...
Regex lookahead for 'not followed by' in grep
...actly that.)
– NHDaly
May 11 '14 at 16:14
4
Verified, correct answer should be combining this ans...
How to create hyperlink to call phone number on mobile devices?
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answered Mar 8 '16 at 16:57
molaromolaro
43044 silver badges1010 bronze badges
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Responding with a JSON object in Node.js (converting object/array to JSON string)
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163
Using res.json with Express:
function random(response) {
console.log("response.json sets th...
How to fix the aspect ratio in ggplot?
... limits on both axis?
– htorque
Aug 16 '11 at 9:38
1
Further to @htorque's comment; if y is inste...
Wget output document and headers to STDOUT
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169
Try the following, no extra headers
wget -qO- www.google.com
Note the trailing -. This is p...
Disable all gcc warnings
... Phil MillerPhil Miller
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