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When is assembly faster than C?
...les that still need compiler-specific code, see
Getting the high part of 64 bit integer multiplication: A portable version using uint64_t for 32x32 => 64-bit multiplies fails to optimize on a 64-bit CPU, so you need intrinsics or __int128 for efficient code on 64-bit systems.
_umul128 on Windo...
Assign pandas dataframe column dtypes
...-05-01
1 b 2 2018-05-02
df.dtypes
x object
y int64
z datetime64[ns]
dtype: object
and confirm the dtype is updated.
OLD/DEPRECATED ANSWER for pandas 0.12 - 0.16: You can use convert_objects to infer better dtypes:
In [21]: df
Out[21]:
x y
0 a 1
1 b 2
In ...
How to multiply duration by integer?
... leave implicit numeric conversion out. After looking back on this that int64(...) * Duration makes much more sense than casting to Duration, which is just a basic violation of how units should work. Sadly that doesn't work. You really have to do Duration * Duration which is horrible.
...
Android adb not found
...e containing adb used to be 32bit. It worked fine on 32bit systems. But on 64bit systems you need to manually install the IA32 library.
For Debian based distributions try this:
sudo apt-get install libc6-i386 lib32stdc++6 lib32gcc1 lib32ncurses5
But since v24.0 platform-tools contains only 64bit...
MFC CString::Format()函数详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...符号数
c输出单个字符
s输出一串字符
f输出实数（6位小数）
e以指数形式输出实数
g选用f与e格式中输出宽度较小的格式，不输出0
ld输入输出long型数据
lf输入输出double型数据
m数据输出宽度为m
.n输出小数位数为n
2...
Cross compile Go on OSX?
... make says: # Building compilers and Go bootstrap tool for host, darwin/amd64 but later on it actually ends up as: --- Installed Go for windows/386 in /usr/local/go Installed commands in /usr/local/go/bin so one shall observe ending rather than beginning of compiling the compiler.
...
PHP script - detect whether running under linux or Windows?
...
This should work in PHP 4.3+:
if (strtolower(PHP_SHLIB_SUFFIX) === 'dll')
{
// Windows
}
else
{
// Linux/UNIX/OS X
}
LoadRunner中参数化技术详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...中提取数据。
9
UseDefinedFunction
从dll的简单函数中获取信息替代参数
【注意】对于参数类型为File/Table的数据文件：
l 在参数数据显示区中，最多只显示前100条数据，之后的不显示，但不影响正...
What does multicore assembly language look like?
...res are part of the architectural state of logical processors within Intel 64 or IA-32 processors
supporting Intel Hyper-Threading Technology. The features can be subdivided into three groups:
Duplicated for each logical processor
Shared by logical processors in a physical processor
Sh...
Get individual query parameters from Uri [duplicate]
...
But you'll need to add a reference to System.Web.dll.
– SLaks
May 21 '10 at 18:28
1
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