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Remove duplicated rows
...for larger data sets
library(microbenchmark)
library(data.table)
set.seed(123)
DF <- as.data.frame(matrix(sample(1e8, 1e5, replace = TRUE), ncol = 10))
DT <- copy(DF)
setDT(DT)
microbenchmark(unique(DF), unique(DT))
# Unit: microseconds
# expr min lq mean median ...
'npm' is not recognized as internal or external command, operable program or batch file
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123
Don't forget to reboot your computer after installing node! That one got me.
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LINQ: “contains” and a Lambda query
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Mark Amery
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answered Dec 29 '17 at 9:42
Soft-BrainS...
How do I pre-populate a jQuery Datepicker textbox with today's date?
...k and doesn't make jQuery search the DOM twice.
– abc123
Aug 1 '13 at 20:36
1
Great, accepted ans...
What's a correct and good way to implement __hash__()?
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Mark Amery
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answered May 25 '10 at 22:59
John Milli...
How do SQL EXISTS statements work?
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98
Think of it this way:
For 'each' row from Suppliers, check if there 'exists' a row in the Ord...
How do you check if a certain index exists in a table?
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AdaTheDevAdaTheDev
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站长投放广告绝对不做的事:Google Adsense和百度联盟广告违规分析 - 更多技...
...是非常不利的。
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Checking if a double (or float) is NaN in C++
...ibrary defined by C99 are not part of current C++ standard ISO/IEC 14882:1998 neither its update ISO/IEC 14882:2003.
In 2005 Technical Report 1 was proposed. The TR1 brings compatibility with C99 to C++. In spite of the fact it has never been officially adopted to become C++ standard, many (GCC 4.0...
How do I replace a git submodule with another repo?
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123
If the location (URL) of the submodule has changed, then you can simply:
Modify your .gitmod...