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C++ performance vs. Java/C#
...uery the machine. It can determine if the machine is Intel or AMD; Pentium 4, Core Solo, or Core Duo; or if supports SSE4, etc.
A C++ program has to be compiled beforehand usually with mixed optimizations so that it runs decently well on all machines, but is not optimized as much as it could be for...
How to Correctly Use Lists in R?
...Why do these two expressions not return the same result?
x = list(1, 2, 3, 4); x2 = list(1:4)
A list can contain any other class as each element. So you can have a list where the first element is a character vector, the second is a data frame, etc. In this case, you have created two different lis...
Visual Studio 2013 Update 4【VS2013 SP4 旗舰版下载地址】 - 更多技术 - ...
Visual Studio 2013 Update 4【VS2013 SP4 旗舰版下载地址】vs2013没有64位版本，但是提供64位编译器，可以编译64位程序。Visual Studio Ultimate 2013 with Update 4 (x86) - DVD (Chinese...vs2013没有64位版本，但是提供64位编译器，可以编译64位程序。
Visu...
How do I base64 encode (decode) in C?
...nary data in an unsigned char variable.
I need to convert them to PEM base64 in c.
I looked in openssl library but i could not find any function.
Does any body have any idea?
...
Write applications in C or C++ for Android? [closed]
...
248
For anyone coming to this via Google, note that starting from SDK 1.6 Android now has an offici...
How do you access command line arguments in Swift?
...
answered Feb 27 at 23:34
pkambpkamb
24.6k1818 gold badges116116 silver badges145145 bronze badges
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Transpose/Unzip Function (inverse of zip)?
...pecial * operator.
>>> zip(*[('a', 1), ('b', 2), ('c', 3), ('d', 4)])
[('a', 'b', 'c', 'd'), (1, 2, 3, 4)]
The way this works is by calling zip with the arguments:
zip(('a', 1), ('b', 2), ('c', 3), ('d', 4))
… except the arguments are passed to zip directly (after being converted to...
How to comment out a block of Python code in Vim
...
415
Step 1: Go to the the first column of the first line you want to comment.
Step 2: Press: Ct...
Pandas: drop a level from a multi-level column index?
...tuples([("a", "b"), ("a", "c")])
>>> df = pd.DataFrame([[1,2], [3,4]], columns=cols)
>>> df
a
b c
0 1 2
1 3 4
[2 rows x 2 columns]
>>> df.columns = df.columns.droplevel()
>>> df
b c
0 1 2
1 3 4
[2 rows x 2 columns]
...
How do I change Eclipse to use spaces instead of tabs?
...
1246
Java Editor
Click Window » Preferences
Expand Java » Code Style
Click Formatter
Click the E...