大约有 47,000 项符合查询结果（耗时：0.0501秒） [XML]
Wolfram's Rule 34 in XKCD [closed]
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Lucas OmanLucas Oman
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What is the most efficient string concatenation method in python?
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Quentin Pradet
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answered Aug 22 '09 at 20:26
John FouhyJohn Fouhy
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How to make rpm auto install dependencies
...re.
– Aaron D. Marasco
May 6 '13 at 22:49
3
@AaronD.Marasco maybe you are correct about the speci...
How to change the order of DataFrame columns?
... 2 3 4 mean
0 0.445598 0.173835 0.343415 0.682252 0.582616 0.445543
1 0.881592 0.696942 0.702232 0.696724 0.373551 0.670208
2 0.662527 0.955193 0.131016 0.609548 0.804694 0.632596
3 0.260919 0.783467 0.593433 0.033426 0.512019 0.436653
4 0.131842 0...
Razor View throwing “The name 'model' does not exist in the current context”
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22 Answers
22
Active
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How would you make two s overlap?
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answered Nov 6 '08 at 22:05
OwenOwen
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What is the best way to compute trending topics or tags?
...> zscore(12, [2, 4, 4, 4, 5, 5, 7, 9])
3.5
>>> zscore(20, [21, 22, 19, 18, 17, 22, 20, 20])
0.0739221270955
>>> zscore(20, [21, 22, 19, 18, 17, 22, 20, 20, 1, 2, 3, 1, 2, 1, 0, 1])
1.00303599234
>>> zscore(2, [21, 22, 19, 18, 17, 22, 20, 20, 1, 2, 3, 1, 2, 1, 0, 1])
-0....
What are the mathematical/computational principles behind this game?
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edited Oct 22 '13 at 8:29
Tobias Kienzler
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How do you calculate log base 2 in Java for integers?
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edited Jul 22 '10 at 3:22
answered Jul 22 '10 at 2:38
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Fastest way to replace NAs in a large data.table
... 1.52 14.81 1.52 14.81
"gc" 0.22 2.14 0.22 2.14
"unique" 0.14 1.36 0.16 1.56
... snip ...
There, I would focus on na.replace and is.na, where there are a few vector copies and vector scans. Those can fairly ea...