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Standardize data columns in R
...nto a matrix
– Julian Karch
Nov 30 '16 at 11:47
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Good introduction to the .NET Reactive Framework [closed]
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T-SQL stored procedure that accepts multiple Id values
...skog has maintained the authoritative answer to this question for the last 16 years: Arrays and Lists in SQL Server.
There are at least a dozen ways to pass an array or list to a query; each has their own unique pros and cons.
Table-Valued Parameters. SQL Server 2008 and higher only, and probabl...
How often does python flush to a file?
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Bill the Lizard
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answered Jul 2 '10 at 16:37
KLee1KLee1
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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'] ...
Bash script processing limited number of commands in parallel
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Augustin
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answered Oct 23 '13 at 13:35
devnulldevnull
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C++ convert vector to vector
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Use std::vector's range constructor:
std::vector<int> intVec;
std::vector<double>...
MySQL Error 1215: Cannot add foreign key constraint
... AND the column).
– ben_979
Apr 28 '16 at 1:15
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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...
How to read an external properties file in Maven
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Mike PoneMike Pone
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