大约有 13,500 项符合查询结果（耗时：0.0286秒） [XML]
Deserialize JSON with C#
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answered Jun 17 '16 at 22:05
Jack FairfieldJack Fairfield
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Get column index from column name in python pandas
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DSMDSM
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How to clear variables in ipython?
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JoopJoop
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How can I know if a process is running?
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answered Jul 6 '16 at 22:05
guneysusguneysus
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Is there an ExecutorService that uses the current thread?
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edited Jul 5 '11 at 14:05
answered Jul 5 '11 at 13:59
ov...
Reasons for using the set.seed function
...: In the academic world, if one claims that his algorithm achieves, say 98.05% performance in one simulation, others need to be able to reproduce it.
?set.seed
Going through the help file of this function, these are some interesting facts:
(1) set.seed() returns NULL, invisible
(2) "Init...
How to check the version before installing a package using apt-get?
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answered Sep 19 '13 at 7:05
Yasiru GYasiru G
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Where do I find the bashrc file on Mac?
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– Michael Dimmitt
Feb 4 '17 at 16:05
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JavaScript string newline character?
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edited Nov 3 '17 at 12:05
answered Jul 20 '09 at 22:46
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Sample random rows in dataframe
...83 0.4231117
8 -1.0356774 -0.1640883
9 -0.3983045 0.7157506
10 -0.9060305 2.3234110
Then select some rows at random:
> df[sample(nrow(df), 3), ]
X1 X2
9 -0.3983045 0.7157506
2 -1.1334614 -0.1973846
10 -0.9060305 2.3234110
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