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What is the purpose of setting a key in data.table?
... 20,000 joins like this on a full table of zip codes. With data tables the script took about 20 min. to run. I didn't even try it with data frames because it would have taken more than 2 weeks.
IMHO you should not just read but study the FAQ and Intro material. It's easier to grasp if you have an a...
Python name mangling
...on for the lack of "private" is cultural, but you'll also notice that most scripting/interpreted languages have no private. A strictly enforceable private is not practical at anything except for compile time.
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WebSockets protocol vs HTTP
...TP. It is not. It's an extension.
The main use-case of WebSockets are Javascript applications which run in the web browser and receive real-time data from a server. Games are a good example.
Before WebSockets, the only method for Javascript applications to interact with a server was through XmlHtt...
Cookie blocked/not saved in IFRAME in Internet Explorer
..., when cookies are blocked, session identifier is not sent, and the target script throws a 'session not found' error.
(I've tried setting the session identifier into the form and loading it from POST variables. This would have worked, but for political reasons I couldn't do that.)
It is possible t...
How do I uniquely identify computers visiting my web site?
...TTPS session key.
getISP(requestIP)|getHTTPSClientKey()
FingerPrintID: JavaScript based fingerprinting based on a modified fingerprint.js. FingerPrint.get()
SessionID: Random key generated when user 1st visits site. BrowserID|ComputerID|randombytes(256)
GoogleID: Generated from __utma cookie. getCoo...
What is the scope of variables in JavaScript?
What is the scope of variables in javascript? Do they have the same scope inside as opposed to outside a function? Or does it even matter? Also, where are the variables stored if they are defined globally?
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Awk学习笔记 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...项
2.1. awk的语法有两种形式
awk [options] 'script' var=value file(s)
awk [options] -f scriptfile var=value file(s)
2.2. 命令选项
-F fs or --field-separator fs
指定输入文件折分隔符，fs是一个字符串或者是一...
Most simple but complete CMake example
...it. If you really want to automate it, a better approach may be to write a script that you can run to regenerate the list of source files (or use a cmake aware IDE that does this for you; I am not familiar with any).
– sgvd
Jan 16 '14 at 16:37
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What is “git remote add …” and “git push origin master”?
...e are a few odd behaviours in git that are hard to change now because many scripts may rely on them, but are confusing to people.
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WiX tricks and tips
...cope="perMachine" Platform="$(var.Platform)"
Compressed="yes" Description="$(var.ProductName)" />
and
<Directory Id="TARGETDIR" Name="SourceDir">
<Directory Id="$(var.PlatformProgramFilesFolder)">
<Directory Id="INSTALLLOCATION" Name="$(var.InstallName)">
Th...