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Convert columns to string in Pandas
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Extracting just Month and Year separately from Pandas Datetime column
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Note that the resulting column is not of the datetime64 dtype anymore. Using df.my_date_column.astype('datetime64[M]'), as in @Juan's answer converts to dates representing the first day of each month.
– Nickolay
May 26 '18 at 19:52
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How to use/install gcc on Mac OS X 10.8 / Xcode 4.4
...nclude-dir=/usr/include/c++/4.2.1 Apple LLVM version 6.0 (clang-600.0.51) (based on LLVM 3.5svn) Target: x86_64-apple-darwin14.0.0 Thread model: posix So am I using gcc?
– Thomas
Dec 14 '14 at 16:11
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C++ Best way to get integer division and remainder
...imize, though, at least for g++. A simple experiment with g++ 6.3.0 on x86_64 revealed that with no optimization at all, you get two idivl instructions, but with -O1 or greater, you get one. As the manual says, “Without any optimization option … Statements are independent”.
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Difference between and
...nt of the XML config into the following entry:
<context:component-scan base-package="com.xxx" />
When I load the context I get the following output:
creating bean B: com.xxx.B@1be0f0a
creating bean C: com.xxx.C@80d1ff
Hmmmm... something is missing. Why?
If you look closelly at the clas...
Make Adobe fonts work with CSS3 @font-face in IE9
...he appropriate tool you can set it to installable embedding allowed.
For a 64-bit version, check @user22600's answer.
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Why does Java switch on contiguous ints appear to run faster with added cases?
... @AndrewBissell My guess is that the different behaviour is based on either (i) cross-architecture performance tests which have shown that the array of pointers is only efficient when the number of cases is larger than 18 or (ii) the code is profiled as it is run and the profiler dete...
How does python numpy.where() work?
...47,
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64,
65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81,
82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98,
99]),)
>>> np.where(a == 90)
(array([90]),)
a = a*40
&...
IPC performance: Named Pipe vs Socket
...nted a project in C with named pipes, thanks to standart file input-output based communication (fopen, fprintf, fscanf ...) it was so easy and clean (if that is also a consideration).
I even coded them with java (I was serializing and sending objects over them!)
Named pipes has one disadvantage:
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Integer division with remainder in JavaScript?
...8 millisec
(a-(a%b))/b // -33, 0.6649 millisec
The above is based on 10 million trials for each.
Conclusion: Use (a/b>>0) (or (~~(a/b)) or (a/b|0)) to achieve about 20% gain in efficiency. Also keep in mind that they are all inconsistent with Math.floor, when a/b<0 &&...