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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 check whether a file or directory exists?
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answered Nov 16 '16 at 4:20
Edward WagnerEdward Wagner
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Bootstrap 3 Flush footer to bottom. not fixed
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answered Jan 9 '15 at 16:11
Jboy FlagaJboy Flaga
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Check if a number has a decimal place/is a whole number
... new :)
– Abe Petrillo
Sep 1 '11 at 16:53
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@Abe: true enough, though I think that's unlikely. I...
Regex lookahead for 'not followed by' in grep
...actly that.)
– NHDaly
May 11 '14 at 16:14
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Verified, correct answer should be combining this ans...
Embed YouTube video - Refused to display in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN'
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edited Mar 16 at 2:20
Peter Mortensen
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How can I obtain the element-wise logical NOT of a pandas Series?
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edited Oct 28 '16 at 18:58
answered Apr 14 '13 at 12:20
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What exactly does @synthesize do?
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answered Jul 16 '10 at 15:37
vodkhangvodkhang
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How to compare binary files to check if they are the same?
... JoeJoe
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Removing transforms in SVG files
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TylerH
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answered Jun 12 '14 at 8:43
Serge SeletskyySerge Seletskyy
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